Merge branch 'master' into add-tests

.github/SECURITY.md

@@ -1,15 +1,14 @@
 # Security Policy
 
-The Caddy project would like to make sure that it stays on top of all practically-exploitable vulnerabilities.
+The Caddy project would like to make sure that it stays on top of all relevant and practically-exploitable vulnerabilities.
 
 
 ## Supported Versions
 
-| Version  | Supported |
-| -------- | ----------|
-| 2.latest | ✔️        |
-| 1.x      | :x:       |
-| < 1.x    | :x:       |
+| Version     | Supported |
+| ----------- | ----------|
+| 2.latest    | ✔️        |
+| <= 2.latest | :x:       |
 
 
 ## Acceptable Scope
@@ -18,7 +17,7 @@ A security report must demonstrate a security bug in the source code from this r
 
 Some security problems are the result of interplay between different components of the Web, rather than a vulnerability in the web server itself. Please only report vulnerabilities in the web server itself, as we cannot coerce the rest of the Web to be fixed (for example, we do not consider IP spoofing, BGP hijacks, or missing/misconfigured HTTP headers a vulnerability in the Caddy web server).
 
-Vulnerabilities caused by misconfigurations are out of scope. Yes, it is entirely possible to craft and use a configuration that is unsafe, just like with every other web server; we recommend against doing that.
+Vulnerabilities caused by misconfigurations are out of scope. Yes, it is entirely possible to craft and use a configuration that is unsafe, just like with every other web server; we recommend against doing that. Similarly, external misconfigurations are out of scope. For example, an open or forwarded port from a public network to a Caddy instance intended to serve only internal clients is not a vulnerability in Caddy.
 
 We do not accept reports if the steps imply or require a compromised system or third-party software, as we cannot control those. We expect that users secure their own systems and keep all their software patched. For example, if untrusted users are able to upload/write/host arbitrary files in the web root directory, it is NOT a security bug in Caddy if those files get served to clients; however, it _would_ be a valid report if a bug in Caddy's source code unintentionally gave unauthorized users the ability to upload unsafe files or delete files without relying on an unpatched system or piece of software.
 
@@ -26,6 +25,8 @@ Client-side exploits are out of scope. In other words, it is not a bug in Caddy
 
 Security bugs in code dependencies (including Go's standard library) are out of scope. Instead, if a dependency has patched a relevant security bug, please feel free to open a public issue or pull request to update that dependency in our code.
 
+We accept security reports and patches, but do not assign CVEs, for code that has not been released with a non-prerelease tag.
+
 
 ## Reporting a Vulnerability
 
@@ -33,6 +34,8 @@ We get a lot of difficult reports that turn out to be invalid. Clear, obvious re
 
 First please ensure your report falls within the accepted scope of security bugs (above).
 
+:warning: **YOU MUST DISCLOSE WHETHER YOU USED LLMs ("AI") IN ANY WAY.** Whether you are using AI for discovery, as part of writing the report or its replies, and/or testing or validating proofs and changes, we require you to mention the extent of it. **FAILURE TO INCLUDE A DISCLOSURE EVEN IF YOU DO NOT USE AI MAY LEAD TO IMMEDIATE DISMISSAL OF YOUR REPORT AND POTENTIAL BLOCKLISTING.** We will not waste our time chatting with bots. But if you're a human, pull up a chair and we'll drink some chocolate milk.
+
 We'll need enough information to verify the bug and make a patch. To speed things up, please include:
 
 - Most minimal possible config (without redactions!)

.github/workflows/ai.yml

@@ -16,8 +16,8 @@ jobs:
       models: read
       contents: read
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
-      - uses: github/ai-moderator@6bcdb2a79c2e564db8d76d7d4439d91a044c4eb6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+      - uses: github/ai-moderator@81159c370785e295c97461ade67d7c33576e9319
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           spam-label: 'spam'

.github/workflows/auto-release-pr.yml

@@ -0,0 +1,221 @@
+name: Release Proposal Approval Tracker
+
+on:
+  pull_request_review:
+    types: [submitted, dismissed]
+  pull_request:
+    types: [labeled, unlabeled, synchronize, closed]
+
+permissions:
+  contents: read
+  pull-requests: write
+  issues: write
+
+jobs:
+  check-approvals:
+    name: Track Maintainer Approvals
+    runs-on: ubuntu-latest
+    # Only run on PRs with release-proposal label
+    if: contains(github.event.pull_request.labels.*.name, 'release-proposal') && github.event.pull_request.state == 'open'
+    
+    steps:
+      - name: Check approvals and update PR
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        env:
+          MAINTAINER_LOGINS: ${{ secrets.MAINTAINER_LOGINS }}
+        with:
+          script: |
+            const pr = context.payload.pull_request;
+            
+            // Extract version from PR title (e.g., "Release Proposal: v1.2.3")
+            const versionMatch = pr.title.match(/Release Proposal:\s*(v[\d.]+(?:-[\w.]+)?)/);
+            const commitMatch = pr.body.match(/\*\*Target Commit:\*\*\s*`([a-f0-9]+)`/);
+            
+            if (!versionMatch || !commitMatch) {
+              console.log('Could not extract version from title or commit from body');
+              return;
+            }
+            
+            const version = versionMatch[1];
+            const targetCommit = commitMatch[1];
+            
+            console.log(`Version: ${version}, Target Commit: ${targetCommit}`);
+            
+            // Get all reviews
+            const reviews = await github.rest.pulls.listReviews({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: pr.number
+            });
+            
+            // Get list of maintainers
+            const maintainerLoginsRaw = process.env.MAINTAINER_LOGINS || '';
+            const maintainerLogins = maintainerLoginsRaw
+              .split(/[,;]/)
+              .map(login => login.trim())
+              .filter(login => login.length > 0);
+            
+            console.log(`Maintainer logins: ${maintainerLogins.join(', ')}`);
+            
+            // Get the latest review from each user
+            const latestReviewsByUser = {};
+            reviews.data.forEach(review => {
+              const username = review.user.login;
+              if (!latestReviewsByUser[username] || new Date(review.submitted_at) > new Date(latestReviewsByUser[username].submitted_at)) {
+                latestReviewsByUser[username] = review;
+              }
+            });
+            
+            // Count approvals from maintainers
+            const maintainerApprovals = Object.entries(latestReviewsByUser)
+              .filter(([username, review]) => 
+                maintainerLogins.includes(username) && 
+                review.state === 'APPROVED'
+              )
+              .map(([username, review]) => username);
+            
+            const approvalCount = maintainerApprovals.length;
+            console.log(`Found ${approvalCount} maintainer approvals from: ${maintainerApprovals.join(', ')}`);
+            
+            // Get current labels
+            const currentLabels = pr.labels.map(label => label.name);
+            const hasApprovedLabel = currentLabels.includes('approved');
+            const hasAwaitingApprovalLabel = currentLabels.includes('awaiting-approval');
+            
+            if (approvalCount >= 2 && !hasApprovedLabel) {
+              console.log('✅ Quorum reached! Updating PR...');
+              
+              // Remove awaiting-approval label if present
+              if (hasAwaitingApprovalLabel) {
+                await github.rest.issues.removeLabel({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  issue_number: pr.number,
+                  name: 'awaiting-approval'
+                }).catch(e => console.log('Label not found:', e.message));
+              }
+              
+              // Add approved label
+              await github.rest.issues.addLabels({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: pr.number,
+                labels: ['approved']
+              });
+              
+              // Add comment with tagging instructions
+              const approversList = maintainerApprovals.map(u => `@${u}`).join(', ');
+              const commentBody = [
+                '## ✅ Approval Quorum Reached',
+                '',
+                `This release proposal has been approved by ${approvalCount} maintainers: ${approversList}`,
+                '',
+                '### Tagging Instructions',
+                '',
+                'A maintainer should now create and push the signed tag:',
+                '',
+                '```bash',
+                `git checkout ${targetCommit}`,
+                `git tag -s ${version} -m "Release ${version}"`,
+                `git push origin ${version}`,
+                `git checkout -`,
+                '```',
+                '',
+                'The release workflow will automatically start when the tag is pushed.'
+              ].join('\n');
+              
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: pr.number,
+                body: commentBody
+              });
+              
+              console.log('Posted tagging instructions');
+            } else if (approvalCount < 2 && hasApprovedLabel) {
+              console.log('⚠️  Approval count dropped below quorum, removing approved label');
+              
+              // Remove approved label
+              await github.rest.issues.removeLabel({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: pr.number,
+                name: 'approved'
+              }).catch(e => console.log('Label not found:', e.message));
+              
+              // Add awaiting-approval label
+              if (!hasAwaitingApprovalLabel) {
+                await github.rest.issues.addLabels({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  issue_number: pr.number,
+                  labels: ['awaiting-approval']
+                });
+              }
+            } else {
+              console.log(`⏳ Waiting for more approvals (${approvalCount}/2 required)`);
+            }
+
+  handle-pr-closed:
+    name: Handle PR Closed Without Tag
+    runs-on: ubuntu-latest
+    if: |
+      contains(github.event.pull_request.labels.*.name, 'release-proposal') &&
+      github.event.action == 'closed' && !contains(github.event.pull_request.labels.*.name, 'released')
+    
+    steps:
+      - name: Add cancelled label and comment
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        with:
+          script: |
+            const pr = context.payload.pull_request;
+            
+            // Check if the release-in-progress label is present
+            const hasReleaseInProgress = pr.labels.some(label => label.name === 'release-in-progress');
+            
+            if (hasReleaseInProgress) {
+              // PR was closed while release was in progress - this is unusual
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: pr.number,
+                body: '⚠️ **Warning:** This PR was closed while a release was in progress. This may indicate an error. Please verify the release status.'
+              });
+            } else {
+              // PR was closed before tag was created - this is normal cancellation
+              const versionMatch = pr.title.match(/Release Proposal:\s*(v[\d.]+(?:-[\w.]+)?)/);
+              const version = versionMatch ? versionMatch[1] : 'unknown';
+              
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: pr.number,
+                body: `## 🚫 Release Proposal Cancelled\n\nThis release proposal for ${version} was closed without creating the tag.\n\nIf you want to proceed with this release later, you can create a new release proposal.`
+              });
+            }
+            
+            // Add cancelled label
+            await github.rest.issues.addLabels({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: pr.number,
+              labels: ['cancelled']
+            });
+            
+            // Remove other workflow labels if present
+            const labelsToRemove = ['awaiting-approval', 'approved', 'release-in-progress'];
+            for (const label of labelsToRemove) {
+              try {
+                await github.rest.issues.removeLabel({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  issue_number: pr.number,
+                  name: label
+                });
+              } catch (e) {
+                console.log(`Label ${label} not found or already removed`);
+              }
+            }
+            
+            console.log('Added cancelled label and cleaned up workflow labels');
+            

.github/workflows/ci.yml

@@ -31,13 +31,13 @@ jobs:
           - mac
           - windows
         go:
-          - '1.25'
+          - '1.26'
 
         include:
         # Set the minimum Go patch version for the given Go minor
         # Usable via ${{ matrix.GO_SEMVER }}
-        - go: '1.25'
-          GO_SEMVER: '~1.25.0'
+        - go: '1.26'
+          GO_SEMVER: '~1.26.0'
 
         # Set some variables per OS, usable via ${{ matrix.VAR }}
         # OS_LABEL: the VM label from GitHub Actions (see https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories)
@@ -65,15 +65,15 @@ jobs:
       actions: write # to allow uploading artifacts and cache
     steps:
     - name: Harden the runner (Audit all outbound calls)
-      uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+      uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
       with:
         egress-policy: audit
 
     - name: Checkout code
-      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
     - name: Install Go
-      uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
+      uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 # v6.3.0
       with:
         go-version: ${{ matrix.GO_SEMVER }}
         check-latest: true
@@ -120,7 +120,7 @@ jobs:
         ./caddy stop
 
     - name: Publish Build Artifact
-      uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+      uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
       with:
         name: caddy_${{ runner.os }}_go${{ matrix.go }}_${{ steps.vars.outputs.short_sha }}
         path: ${{ matrix.CADDY_BIN_PATH }}
@@ -162,13 +162,13 @@ jobs:
     continue-on-error: true  # August 2020: s390x VM is down due to weather and power issues
     steps:
       - name: Harden the runner (Audit all outbound calls)
-        uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+        uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
         with:
           egress-policy: audit
           allowed-endpoints: ci-s390x.caddyserver.com:22
 
       - name: Checkout code
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Run Tests
         run: |
           set +e
@@ -221,27 +221,27 @@ jobs:
     if: github.event.pull_request.head.repo.full_name == 'caddyserver/caddy' && github.actor != 'dependabot[bot]'
     steps:
       - name: Harden the runner (Audit all outbound calls)
-        uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+        uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
         with:
           egress-policy: audit
 
       - name: Checkout code
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       
-      - uses: goreleaser/goreleaser-action@e435ccd777264be153ace6237001ef4d979d3a7a # v6.4.0
+      - uses: goreleaser/goreleaser-action@ec59f474b9834571250b370d4735c50f8e2d1e29 # v7.0.0
         with:
           version: latest
           args: check
       - name: Install Go
-        uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
+        uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 # v6.3.0
         with:
-          go-version: "~1.25"
+          go-version: "~1.26"
           check-latest: true
       - name: Install xcaddy
         run: |
           go install github.com/caddyserver/xcaddy/cmd/xcaddy@latest
           xcaddy version
-      - uses: goreleaser/goreleaser-action@e435ccd777264be153ace6237001ef4d979d3a7a # v6.4.0
+      - uses: goreleaser/goreleaser-action@ec59f474b9834571250b370d4735c50f8e2d1e29 # v7.0.0
         with:
           version: latest
           args: build --single-target --snapshot

.github/workflows/cross-build.yml

@@ -36,13 +36,13 @@ jobs:
           - 'darwin'
           - 'netbsd'
         go:
-          - '1.25'
+          - '1.26'
 
         include:
         # Set the minimum Go patch version for the given Go minor
         # Usable via ${{ matrix.GO_SEMVER }}
-        - go: '1.25'
-          GO_SEMVER: '~1.25.0'
+        - go: '1.26'
+          GO_SEMVER: '~1.26.0'
 
     runs-on: ubuntu-latest
     permissions:
@@ -51,15 +51,15 @@ jobs:
     continue-on-error: true
     steps:
       - name: Harden the runner (Audit all outbound calls)
-        uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+        uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
         with:
           egress-policy: audit
 
       - name: Checkout code
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Install Go
-        uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
+        uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 # v6.3.0
         with:
           go-version: ${{ matrix.GO_SEMVER }}
           check-latest: true

.github/workflows/lint.yml

@@ -45,18 +45,18 @@ jobs:
 
     steps:
       - name: Harden the runner (Audit all outbound calls)
-        uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+        uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
         with:
           egress-policy: audit
 
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
-      - uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 # v6.3.0
         with:
-          go-version: '~1.25'
+          go-version: '~1.26'
           check-latest: true
 
       - name: golangci-lint
-        uses: golangci/golangci-lint-action@4afd733a84b1f43292c63897423277bb7f4313a9 # v8.0.0
+        uses: golangci/golangci-lint-action@1e7e51e771db61008b38414a730f564565cf7c20 # v9.2.0
         with:
           version: latest
 
@@ -73,14 +73,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Harden the runner (Audit all outbound calls)
-        uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+        uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
         with:
           egress-policy: audit
 
       - name: govulncheck
         uses: golang/govulncheck-action@b625fbe08f3bccbe446d94fbf87fcc875a4f50ee # v1.0.4
         with:
-          go-version-input: '~1.25.0'
+          go-version-input: '~1.26.0'
           check-latest: true
   
   dependency-review:
@@ -90,14 +90,14 @@ jobs:
       pull-requests: write
     steps:
       - name: Harden the runner (Audit all outbound calls)
-        uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+        uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
         with:
           egress-policy: audit
 
       - name: 'Checkout Repository'
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: 'Dependency Review'
-        uses: actions/dependency-review-action@56339e523c0409420f6c2c9a2f4292bbb3c07dd3 # v4.8.0
+        uses: actions/dependency-review-action@05fe4576374b728f0c523d6a13d64c25081e0803 # v4.8.3
         with:
           comment-summary-in-pr: on-failure
           # https://github.com/actions/dependency-review-action/issues/430#issuecomment-1468975566

.github/workflows/release-proposal.yml

@@ -0,0 +1,249 @@
+name: Release Proposal
+
+# This workflow creates a release proposal as a PR that requires approval from maintainers
+# Triggered manually by maintainers when ready to prepare a release
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version to release (e.g., v2.8.0)'
+        required: true
+        type: string
+      commit_hash:
+        description: 'Commit hash to release from'
+        required: true
+        type: string
+
+permissions:
+  contents: read
+
+jobs:
+  create-proposal:
+    name: Create Release Proposal
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+      issues: write
+    
+    steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
+        with:
+          egress-policy: audit
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          fetch-depth: 0
+
+      - name: Trim and validate inputs
+        id: inputs
+        run: |
+          # Trim whitespace from inputs
+          VERSION=$(echo "${{ inputs.version }}" | xargs)
+          COMMIT_HASH=$(echo "${{ inputs.commit_hash }}" | xargs)
+          
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+          echo "commit_hash=$COMMIT_HASH" >> $GITHUB_OUTPUT
+          
+          # Validate version format
+          if [[ ! "$VERSION" =~ ^v[0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9.]+)?$ ]]; then
+            echo "Error: Version must follow semver format (e.g., v2.8.0 or v2.8.0-beta.1)"
+            exit 1
+          fi
+          
+          # Validate commit hash format
+          if [[ ! "$COMMIT_HASH" =~ ^[a-f0-9]{7,40}$ ]]; then
+            echo "Error: Commit hash must be a valid SHA (7-40 characters)"
+            exit 1
+          fi
+          
+          # Check if commit exists
+          if ! git cat-file -e "$COMMIT_HASH"; then
+            echo "Error: Commit $COMMIT_HASH does not exist"
+            exit 1
+          fi
+
+      - name: Check if tag already exists
+        run: |
+          if git rev-parse "${{ steps.inputs.outputs.version }}" >/dev/null 2>&1; then
+            echo "Error: Tag ${{ steps.inputs.outputs.version }} already exists"
+            exit 1
+          fi
+
+      - name: Check for existing proposal PR
+        id: check_existing
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        with:
+          script: |
+            const version = '${{ steps.inputs.outputs.version }}';
+            
+            // Search for existing open PRs with release-proposal label that match this version
+            const openPRs = await github.rest.pulls.list({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              state: 'open',
+              sort: 'updated',
+              direction: 'desc'
+            });
+            
+            const existingOpenPR = openPRs.data.find(pr => 
+              pr.title.includes(version) && 
+              pr.labels.some(label => label.name === 'release-proposal')
+            );
+            
+            if (existingOpenPR) {
+              const hasReleased = existingOpenPR.labels.some(label => label.name === 'released');
+              const hasReleaseInProgress = existingOpenPR.labels.some(label => label.name === 'release-in-progress');
+              
+              if (hasReleased || hasReleaseInProgress) {
+                core.setFailed(`A release for ${version} is already in progress or completed: ${existingOpenPR.html_url}`);
+              } else {
+                core.setFailed(`An open release proposal already exists for ${version}: ${existingOpenPR.html_url}\n\nPlease use the existing PR or close it first.`);
+              }
+              return;
+            }
+            
+            // Check for closed PRs with this version that were cancelled
+            const closedPRs = await github.rest.pulls.list({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              state: 'closed',
+              sort: 'updated',
+              direction: 'desc'
+            });
+            
+            const cancelledPR = closedPRs.data.find(pr => 
+              pr.title.includes(version) && 
+              pr.labels.some(label => label.name === 'release-proposal') &&
+              pr.labels.some(label => label.name === 'cancelled')
+            );
+            
+            if (cancelledPR) {
+              console.log(`Found previously cancelled proposal for ${version}: ${cancelledPR.html_url}`);
+              console.log('Creating new proposal to replace cancelled one...');
+            } else {
+              console.log(`No existing proposal found for ${version}, proceeding...`);
+            }
+
+      - name: Generate changelog and create branch
+        id: setup
+        run: |
+          VERSION="${{ steps.inputs.outputs.version }}"
+          COMMIT_HASH="${{ steps.inputs.outputs.commit_hash }}"
+          
+          # Create a new branch for the release proposal
+          BRANCH_NAME="release_proposal-$VERSION"
+          git checkout -b "$BRANCH_NAME"
+          
+          # Calculate how many commits behind HEAD
+          COMMITS_BEHIND=$(git rev-list --count ${COMMIT_HASH}..HEAD)
+          
+          if [ "$COMMITS_BEHIND" -eq 0 ]; then
+            BEHIND_INFO="This is the latest commit (HEAD)"
+          else
+            BEHIND_INFO="This commit is **${COMMITS_BEHIND} commits behind HEAD**"
+          fi
+          
+          echo "commits_behind=$COMMITS_BEHIND" >> $GITHUB_OUTPUT
+          echo "behind_info=$BEHIND_INFO" >> $GITHUB_OUTPUT
+          
+          # Get the last tag
+          LAST_TAG=$(git describe --tags --abbrev=0 2>/dev/null || echo "")
+          
+          if [ -z "$LAST_TAG" ]; then
+            echo "No previous tag found, generating full changelog"
+            COMMITS=$(git log --pretty=format:"- %s (%h)" --reverse "$COMMIT_HASH")
+          else
+            echo "Generating changelog since $LAST_TAG"
+            COMMITS=$(git log --pretty=format:"- %s (%h)" --reverse "${LAST_TAG}..$COMMIT_HASH")
+          fi
+          
+          # Store changelog for PR body
+          CLEANSED_COMMITS=$(echo "$COMMITS" | sed 's/`/\\`/g')
+          echo "changelog<<EOF" >> $GITHUB_OUTPUT
+          echo "$CLEANSED_COMMITS" >> $GITHUB_OUTPUT
+          echo "EOF" >> $GITHUB_OUTPUT
+          
+          # Create empty commit for the PR
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git commit --allow-empty -m "Release proposal for $VERSION"
+          
+          # Push the branch
+          git push origin "$BRANCH_NAME"
+          
+          echo "branch_name=$BRANCH_NAME" >> $GITHUB_OUTPUT
+
+      - name: Create release proposal PR
+        id: create_pr
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        with:
+          script: |
+            const changelog = `${{ steps.setup.outputs.changelog }}`;
+            
+            const pr = await github.rest.pulls.create({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              title: `Release Proposal: ${{ steps.inputs.outputs.version }}`,
+              head: '${{ steps.setup.outputs.branch_name }}',
+              base: 'master',
+              body: `## Release Proposal: ${{ steps.inputs.outputs.version }}
+            
+            **Target Commit:** \`${{ steps.inputs.outputs.commit_hash }}\`
+            **Requested by:** @${{ github.actor }}
+            **Commit Status:** ${{ steps.setup.outputs.behind_info }}
+            
+            This PR proposes creating release tag \`${{ steps.inputs.outputs.version }}\` at commit \`${{ steps.inputs.outputs.commit_hash }}\`.
+            
+            ### Approval Process
+            
+            This PR requires **approval from 2+ maintainers** before the tag can be created.
+            
+            ### What happens next?
+            
+            1. Maintainers review this proposal
+            2. When 2+ maintainer approvals are received, an automated workflow will post tagging instructions
+            3. A maintainer manually creates and pushes the signed tag
+            4. The release workflow is triggered automatically by the tag push
+            5. Upon release completion, this PR is closed and the branch is deleted
+            
+            ### Changes Since Last Release
+            
+            ${changelog}
+            
+            ### Release Checklist
+            
+            - [ ] All tests pass
+            - [ ] Security review completed
+            - [ ] Documentation updated
+            - [ ] Breaking changes documented
+            
+            ---
+            
+            **Note:** Tag creation is manual and requires a signed tag from a maintainer.`,
+              draft: true
+            });
+            
+            // Add labels
+            await github.rest.issues.addLabels({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: pr.data.number,
+              labels: ['release-proposal', 'awaiting-approval']
+            });
+            
+            console.log(`Created PR: ${pr.data.html_url}`);
+            
+            return { number: pr.data.number, url: pr.data.html_url };
+          result-encoding: json
+
+      - name: Post summary
+        run: |
+          echo "## Release Proposal PR Created! 🚀" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "Version: **${{ steps.inputs.outputs.version }}**" >> $GITHUB_STEP_SUMMARY
+          echo "Commit: **${{ steps.inputs.outputs.commit_hash }}**" >> $GITHUB_STEP_SUMMARY
+          echo "Status: ${{ steps.setup.outputs.behind_info }}" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "PR: ${{ fromJson(steps.create_pr.outputs.result).url }}" >> $GITHUB_STEP_SUMMARY

.github/workflows/release.yml

@@ -13,20 +13,334 @@ permissions:
   contents: read
 
 jobs:
+  verify-tag:
+    name: Verify Tag Signature and Approvals
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+      issues: write
+    
+    outputs:
+      verification_passed: ${{ steps.verify.outputs.passed }}
+      tag_version: ${{ steps.info.outputs.version }}
+      proposal_issue_number: ${{ steps.find_proposal.outputs.result && fromJson(steps.find_proposal.outputs.result).number || '' }}
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          fetch-depth: 0
+      # Force fetch upstream tags -- because 65 minutes
+      # tl;dr: actions/checkout@v3 runs this line:
+      #   git -c protocol.version=2 fetch --no-tags --prune --progress --no-recurse-submodules --depth=1 origin +ebc278ec98bb24f2852b61fde2a9bf2e3d83818b:refs/tags/
+      # which makes its own local lightweight tag, losing all the annotations in the process. Our earlier script ran:
+      #   git fetch --prune --unshallow
+      # which doesn't overwrite that tag because that would be destructive.
+      # Credit to @francislavoie for the investigation.
+      # https://github.com/actions/checkout/issues/290#issuecomment-680260080
+      - name: Force fetch upstream tags
+        run: git fetch --tags --force
+
+      - name: Get tag info
+        id: info
+        run: |
+          echo "version=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+          echo "sha=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT
+
+       # https://github.community/t5/GitHub-Actions/How-to-get-just-the-tag-name/m-p/32167/highlight/true#M1027
+      - name: Print Go version and environment
+        id: vars
+        run: |
+          printf "Using go at: $(which go)\n"
+          printf "Go version: $(go version)\n"
+          printf "\n\nGo environment:\n\n"
+          go env
+          printf "\n\nSystem environment:\n\n"
+          env
+          echo "version_tag=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_OUTPUT
+          echo "short_sha=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+
+          # Add "pip install" CLI tools to PATH
+          echo ~/.local/bin >> $GITHUB_PATH
+
+          # Parse semver
+          TAG=${GITHUB_REF/refs\/tags\//}
+          SEMVER_RE='[^0-9]*\([0-9]*\)[.]\([0-9]*\)[.]\([0-9]*\)\([0-9A-Za-z\.-]*\)'
+          TAG_MAJOR=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\1#"`
+          TAG_MINOR=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\2#"`
+          TAG_PATCH=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\3#"`
+          TAG_SPECIAL=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\4#"`
+          echo "tag_major=${TAG_MAJOR}" >> $GITHUB_OUTPUT
+          echo "tag_minor=${TAG_MINOR}" >> $GITHUB_OUTPUT
+          echo "tag_patch=${TAG_PATCH}" >> $GITHUB_OUTPUT
+          echo "tag_special=${TAG_SPECIAL}" >> $GITHUB_OUTPUT
+
+      - name: Validate commits and tag signatures
+        id: verify
+        env:
+          signing_keys: ${{ secrets.SIGNING_KEYS }}
+        run: |
+          # Read the string into an array, splitting by IFS
+          IFS=";" read -ra keys_collection <<< "$signing_keys"
+          
+          # ref: https://docs.github.com/en/actions/reference/workflows-and-actions/contexts#example-usage-of-the-runner-context
+          touch "${{ runner.temp }}/allowed_signers"
+
+          # Iterate and print the split elements
+          for item in "${keys_collection[@]}"; do
+          
+            # trim leading whitespaces
+            item="${item##*( )}"
+
+            # trim trailing whitespaces
+            item="${item%%*( )}"
+            
+            IFS=" " read -ra key_components <<< "$item"
+            # git wants it in format: email address, type, public key
+            # ssh has it in format: type, public key, email address
+            echo "${key_components[2]} namespaces=\"git\" ${key_components[0]} ${key_components[1]}" >> "${{ runner.temp }}/allowed_signers"
+          done
+
+          git config set --global gpg.ssh.allowedSignersFile "${{ runner.temp }}/allowed_signers"
+
+          echo "Verifying the tag: ${{ steps.vars.outputs.version_tag }}"
+          
+          # Verify the tag is signed
+          if ! git verify-tag -v "${{ steps.vars.outputs.version_tag }}" 2>&1; then
+            echo "❌ Tag verification failed!"
+            echo "passed=false" >> $GITHUB_OUTPUT
+            git push --delete origin "${{ steps.vars.outputs.version_tag }}"
+            exit 1
+          fi
+          # Run it again to capture the output
+          git verify-tag -v "${{ steps.vars.outputs.version_tag }}" 2>&1 | tee /tmp/verify-output.txt;
+
+          # SSH verification output typically includes the key fingerprint
+          # Use GNU grep with Perl regex for cleaner extraction (Linux environment)
+          KEY_SHA256=$(grep -oP "SHA256:[\"']?\K[A-Za-z0-9+/=]+(?=[\"']?)" /tmp/verify-output.txt | head -1 || echo "")
+          
+          if [ -z "$KEY_SHA256" ]; then
+            # Try alternative pattern with "key" prefix
+            KEY_SHA256=$(grep -oP "key SHA256:[\"']?\K[A-Za-z0-9+/=]+(?=[\"']?)" /tmp/verify-output.txt | head -1 || echo "")
+          fi
+          
+          if [ -z "$KEY_SHA256" ]; then
+            # Fallback: extract any base64-like string (40+ chars)
+            KEY_SHA256=$(grep -oP '[A-Za-z0-9+/]{40,}=?' /tmp/verify-output.txt | head -1 || echo "")
+          fi
+          
+          if [ -z "$KEY_SHA256" ]; then
+            echo "Somehow could not extract SSH key fingerprint from git verify-tag output"
+            echo "Cancelling flow and deleting tag"
+            echo "passed=false" >> $GITHUB_OUTPUT
+            git push --delete origin "${{ steps.vars.outputs.version_tag }}"
+            exit 1
+          fi
+
+          echo "✅ Tag verification succeeded!"
+          echo "passed=true" >> $GITHUB_OUTPUT
+          echo "key_id=$KEY_SHA256" >> $GITHUB_OUTPUT
+
+      - name: Find related release proposal
+        id: find_proposal
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        with:
+          script: |
+            const version = '${{ steps.vars.outputs.version_tag }}';
+            
+            // Search for PRs with release-proposal label that match this version
+            const prs = await github.rest.pulls.list({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              state: 'open', // Changed to 'all' to find both open and closed PRs
+              sort: 'updated',
+              direction: 'desc'
+            });
+            
+            // Find the most recent PR for this version
+            const proposal = prs.data.find(pr => 
+              pr.title.includes(version) && 
+              pr.labels.some(label => label.name === 'release-proposal')
+            );
+            
+            if (!proposal) {
+              console.log(`⚠️  No release proposal PR found for ${version}`);
+              console.log('This might be a hotfix or emergency release');
+              return { number: null, approved: true, approvals: 0, proposedCommit: null };
+            }
+            
+            console.log(`Found proposal PR #${proposal.number} for version ${version}`);
+            
+            // Extract commit hash from PR body
+            const commitMatch = proposal.body.match(/\*\*Target Commit:\*\*\s*`([a-f0-9]+)`/);
+            const proposedCommit = commitMatch ? commitMatch[1] : null;
+            
+            if (proposedCommit) {
+              console.log(`Proposal was for commit: ${proposedCommit}`);
+            } else {
+              console.log('⚠️  No target commit hash found in PR body');
+            }
+            
+            // Get PR reviews to extract approvers
+            let approvers = 'Validated by automation';
+            let approvalCount = 2; // Minimum required
+            
+            try {
+              const reviews = await github.rest.pulls.listReviews({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                pull_number: proposal.number
+              });
+              
+              // Get latest review per user and filter for approvals
+              const latestReviewsByUser = {};
+              reviews.data.forEach(review => {
+                const username = review.user.login;
+                if (!latestReviewsByUser[username] || new Date(review.submitted_at) > new Date(latestReviewsByUser[username].submitted_at)) {
+                  latestReviewsByUser[username] = review;
+                }
+              });
+              
+              const approvalReviews = Object.values(latestReviewsByUser).filter(review => 
+                review.state === 'APPROVED'
+              );
+              
+              if (approvalReviews.length > 0) {
+                approvers = approvalReviews.map(r => '@' + r.user.login).join(', ');
+                approvalCount = approvalReviews.length;
+                console.log(`Found ${approvalCount} approvals from: ${approvers}`);
+              }
+            } catch (error) {
+              console.log(`Could not fetch reviews: ${error.message}`);
+            }
+            
+            return {
+              number: proposal.number,
+              approved: true,
+              approvals: approvalCount,
+              approvers: approvers,
+              proposedCommit: proposedCommit
+            };
+          result-encoding: json
+
+      - name: Verify proposal commit
+        run: |
+          APPROVALS='${{ steps.find_proposal.outputs.result }}'
+          
+          # Parse JSON
+          PROPOSED_COMMIT=$(echo "$APPROVALS" | jq -r '.proposedCommit')
+          CURRENT_COMMIT="${{ steps.info.outputs.sha }}"
+          
+          echo "Proposed commit: $PROPOSED_COMMIT"
+          echo "Current commit: $CURRENT_COMMIT"
+          
+          # Check if commits match (if proposal had a target commit)
+          if [ "$PROPOSED_COMMIT" != "null" ] && [ -n "$PROPOSED_COMMIT" ]; then
+            # Normalize both commits to full SHA for comparison
+            PROPOSED_FULL=$(git rev-parse "$PROPOSED_COMMIT" 2>/dev/null || echo "")
+            CURRENT_FULL=$(git rev-parse "$CURRENT_COMMIT" 2>/dev/null || echo "")
+            
+            if [ -z "$PROPOSED_FULL" ]; then
+              echo "⚠️  Could not resolve proposed commit: $PROPOSED_COMMIT"
+            elif [ "$PROPOSED_FULL" != "$CURRENT_FULL" ]; then
+              echo "❌ Commit mismatch!"
+              echo "The tag points to commit $CURRENT_FULL but the proposal was for $PROPOSED_FULL"
+              echo "This indicates an error in tag creation."
+              # Delete the tag remotely
+              git push --delete origin "${{ steps.vars.outputs.version_tag }}"
+              echo "Tag ${{steps.vars.outputs.version_tag}} has been deleted"
+              exit 1
+            else
+              echo "✅ Commit hash matches proposal"
+            fi
+          else
+            echo "⚠️  No target commit found in proposal (might be legacy release)"
+          fi
+          
+          echo "✅ Tag verification completed"
+
+      - name: Update release proposal PR
+        if: fromJson(steps.find_proposal.outputs.result).number != null
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        with:
+          script: |
+            const result = ${{ steps.find_proposal.outputs.result }};
+            
+            if (result.number) {
+              // Add in-progress label
+              await github.rest.issues.addLabels({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: result.number,
+                labels: ['release-in-progress']
+              });
+              
+              // Remove approved label if present
+              try {
+                await github.rest.issues.removeLabel({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  issue_number: result.number,
+                  name: 'approved'
+                });
+              } catch (e) {
+                console.log('Approved label not found:', e.message);
+              }
+              
+              const commentBody = [
+                '## 🚀 Release Workflow Started',
+                '',
+                '- **Tag:** ${{ steps.info.outputs.version }}',
+                '- **Signed by key:** ${{ steps.verify.outputs.key_id }}',
+                '- **Commit:** ${{ steps.info.outputs.sha }}',
+                '- **Approved by:** ' + result.approvers,
+                '',
+                'Release workflow is now running. This PR will be updated when the release is published.'
+              ].join('\n');
+              
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: result.number,
+                body: commentBody
+              });
+            }
+
+      - name: Summary
+        run: |
+          APPROVALS='${{ steps.find_proposal.outputs.result }}'
+          PROPOSED_COMMIT=$(echo "$APPROVALS" | jq -r '.proposedCommit // "N/A"')
+          APPROVERS=$(echo "$APPROVALS" | jq -r '.approvers // "N/A"')
+          
+          echo "## Tag Verification Summary 🔐" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "- **Tag:** ${{ steps.info.outputs.version }}" >> $GITHUB_STEP_SUMMARY
+          echo "- **Commit:** ${{ steps.info.outputs.sha }}" >> $GITHUB_STEP_SUMMARY
+          echo "- **Proposed Commit:** $PROPOSED_COMMIT" >> $GITHUB_STEP_SUMMARY
+          echo "- **Signature:** ✅ Verified" >> $GITHUB_STEP_SUMMARY
+          echo "- **Signed by:** ${{ steps.verify.outputs.key_id }}" >> $GITHUB_STEP_SUMMARY
+          echo "- **Approvals:** ✅ Sufficient" >> $GITHUB_STEP_SUMMARY
+          echo "- **Approved by:** $APPROVERS" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "Proceeding with release build..." >> $GITHUB_STEP_SUMMARY
+      
   release:
     name: Release
+    needs: verify-tag
+    if: ${{ needs.verify-tag.outputs.verification_passed == 'true' }}
     strategy:
       matrix:
         os: 
           - ubuntu-latest
         go: 
-          - '1.25'
+          - '1.26'
 
         include:
         # Set the minimum Go patch version for the given Go minor
         # Usable via ${{ matrix.GO_SEMVER }}
-        - go: '1.25'
-          GO_SEMVER: '~1.25.0'
+        - go: '1.26'
+          GO_SEMVER: '~1.26.0'
 
     runs-on: ${{ matrix.os }}
     # https://github.com/sigstore/cosign/issues/1258#issuecomment-1002251233
@@ -36,26 +350,28 @@ jobs:
       # https://docs.github.com/en/rest/overview/permissions-required-for-github-apps#permission-on-contents
       # "Releases" is part of `contents`, so it needs the `write`
       contents: write
+      issues: write
+      pull-requests: write
 
     steps:
     - name: Harden the runner (Audit all outbound calls)
-      uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+      uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
       with:
         egress-policy: audit
 
     - name: Checkout code
-      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       with:
         fetch-depth: 0
 
     - name: Install Go
-      uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
+      uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 # v6.3.0
       with:
         go-version: ${{ matrix.GO_SEMVER }}
         check-latest: true
 
     # Force fetch upstream tags -- because 65 minutes
-    # tl;dr: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v4.2.2 runs this line:
+    # tl;dr: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v4.2.2 runs this line:
     #   git -c protocol.version=2 fetch --no-tags --prune --progress --no-recurse-submodules --depth=1 origin +ebc278ec98bb24f2852b61fde2a9bf2e3d83818b:refs/tags/
     # which makes its own local lightweight tag, losing all the annotations in the process. Our earlier script ran:
     #   git fetch --prune --unshallow
@@ -98,22 +414,12 @@ jobs:
     - name: Install Cloudsmith CLI
       run: pip install --upgrade cloudsmith-cli
 
-    - name: Validate commits and tag signatures
-      run: |
-        
-        # Import Matt Holt's key
-        curl 'https://github.com/mholt.gpg' | gpg --import
-
-        echo "Verifying the tag: ${{ steps.vars.outputs.version_tag }}"
-        # tags are only accepted if signed by Matt's key
-        git verify-tag "${{ steps.vars.outputs.version_tag }}" || exit 1
-
     - name: Install Cosign
       uses: sigstore/cosign-installer@d7543c93d881b35a8faa02e8e3605f69b7a1ce62 # main
     - name: Cosign version
       run: cosign version
     - name: Install Syft
-      uses: anchore/sbom-action/download-syft@f8bdd1d8ac5e901a77a92f111440fdb1b593736b # main
+      uses: anchore/sbom-action/download-syft@17ae1740179002c89186b61233e0f892c3118b11 # main
     - name: Syft version
       run: syft version
     - name: Install xcaddy
@@ -122,7 +428,7 @@ jobs:
         xcaddy version
     # GoReleaser will take care of publishing those artifacts into the release
     - name: Run GoReleaser
-      uses: goreleaser/goreleaser-action@e435ccd777264be153ace6237001ef4d979d3a7a # v6.4.0
+      uses: goreleaser/goreleaser-action@ec59f474b9834571250b370d4735c50f8e2d1e29 # v7.0.0
       with:
         version: latest
         args: release --clean --timeout 60m
@@ -188,3 +494,72 @@ jobs:
           echo "Pushing $filename to 'testing'"
           cloudsmith push deb caddy/testing/any-distro/any-version $filename
         done
+
+    - name: Update release proposal PR
+      if: needs.verify-tag.outputs.proposal_issue_number != ''
+      uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+      with:
+        script: |
+          const prNumber = parseInt('${{ needs.verify-tag.outputs.proposal_issue_number }}');
+          
+          if (prNumber) {
+            // Get PR details to find the branch
+            const pr = await github.rest.pulls.get({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: prNumber
+            });
+            
+            const branchName = pr.data.head.ref;
+            
+            // Remove in-progress label
+            try {
+              await github.rest.issues.removeLabel({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: prNumber,
+                name: 'release-in-progress'
+              });
+            } catch (e) {
+              console.log('Label not found:', e.message);
+            }
+            
+            // Add released label
+            await github.rest.issues.addLabels({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: prNumber,
+              labels: ['released']
+            });
+            
+            // Add final comment
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: prNumber,
+              body: '## ✅ Release Published\n\nThe release has been successfully published and is now available.'
+            });
+            
+            // Close the PR if it's still open
+            if (pr.data.state === 'open') {
+              await github.rest.pulls.update({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                pull_number: prNumber,
+                state: 'closed'
+              });
+              console.log(`Closed PR #${prNumber}`);
+            }
+            
+            // Delete the branch
+            try {
+              await github.rest.git.deleteRef({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                ref: `heads/${branchName}`
+              });
+              console.log(`Deleted branch: ${branchName}`);
+            } catch (e) {
+              console.log(`Could not delete branch ${branchName}: ${e.message}`);
+            }
+          }

.github/workflows/release_published.yml

@@ -24,12 +24,12 @@ jobs:
 
     # See https://github.com/peter-evans/repository-dispatch
     - name: Harden the runner (Audit all outbound calls)
-      uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+      uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
       with:
         egress-policy: audit
 
     - name: Trigger event on caddyserver/dist
-      uses: peter-evans/repository-dispatch@5fc4efd1a4797ddb68ffd0714a238564e4cc0e6f # v4.0.0
+      uses: peter-evans/repository-dispatch@28959ce8df70de7be546dd1250a005dd32156697 # v4.0.1
       with:
         token: ${{ secrets.REPO_DISPATCH_TOKEN }}
         repository: caddyserver/dist
@@ -37,7 +37,7 @@ jobs:
         client-payload: '{"tag": "${{ github.event.release.tag_name }}"}'
 
     - name: Trigger event on caddyserver/caddy-docker
-      uses: peter-evans/repository-dispatch@5fc4efd1a4797ddb68ffd0714a238564e4cc0e6f # v4.0.0
+      uses: peter-evans/repository-dispatch@28959ce8df70de7be546dd1250a005dd32156697 # v4.0.1
       with:
         token: ${{ secrets.REPO_DISPATCH_TOKEN }}
         repository: caddyserver/caddy-docker

.github/workflows/scorecard.yml

@@ -37,12 +37,12 @@ jobs:
 
     steps:
       - name: Harden the runner (Audit all outbound calls)
-        uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+        uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
         with:
           egress-policy: audit
 
       - name: "Checkout code"
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
 
@@ -72,7 +72,7 @@ jobs:
       # Upload the results as artifacts (optional). Commenting out will disable uploads of run results in SARIF
       # format to the repository Actions tab.
       - name: "Upload artifact"
-        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
         with:
           name: SARIF file
           path: results.sarif
@@ -81,6 +81,6 @@ jobs:
       # Upload the results to GitHub's code scanning dashboard (optional).
       # Commenting out will disable upload of results to your repo's Code Scanning dashboard
       - name: "Upload to code-scanning"
-        uses: github/codeql-action/upload-sarif@3599b3baa15b485a2e49ef411a7a4bb2452e7f93 # v3.29.5
+        uses: github/codeql-action/upload-sarif@89a39a4e59826350b863aa6b6252a07ad50cf83e # v3.29.5
         with:
           sarif_file: results.sarif

.golangci.yml

@@ -32,6 +32,7 @@ linters:
     - importas
     - ineffassign
     - misspell
+    - modernize
     - prealloc
     - promlinter
     - sloglint

.goreleaser.yml

@@ -13,7 +13,7 @@ before:
     - cp cmd/caddy/main.go caddy-build/main.go
     - /bin/sh -c 'cd ./caddy-build && go mod init caddy'
     # prepare syso files for windows embedding
-    - /bin/sh -c 'for a in amd64 arm arm64; do XCADDY_SKIP_BUILD=1 GOOS=windows GOARCH=$a xcaddy build {{.Env.TAG}}; done'
+    - /bin/sh -c 'for a in amd64 arm64; do XCADDY_SKIP_BUILD=1 GOOS=windows GOARCH=$a xcaddy build {{.Env.TAG}}; done'
     - /bin/sh -c 'mv /tmp/buildenv_*/*.syso caddy-build'
     # GoReleaser doesn't seem to offer {{.Tag}} at this stage, so we have to embed it into the env
     # so we run: TAG=$(git describe --abbrev=0) goreleaser release --rm-dist --skip-publish --skip-validate
@@ -67,6 +67,8 @@ builds:
       goarch: s390x
     - goos: windows
       goarch: riscv64
+    - goos: windows
+      goarch: arm
     - goos: freebsd
       goarch: ppc64le
     - goos: freebsd

README.md

@@ -12,24 +12,52 @@
 <hr>
 <h3 align="center">Every site on HTTPS</h3>
 <p align="center">Caddy is an extensible server platform that uses TLS by default.</p>
-<p align="center">
-	<a href="https://github.com/caddyserver/caddy/actions/workflows/ci.yml"><img src="https://github.com/caddyserver/caddy/actions/workflows/ci.yml/badge.svg"></a>
-	<a href="https://www.bestpractices.dev/projects/7141"><img src="https://www.bestpractices.dev/projects/7141/badge"></a>
-	<a href="https://pkg.go.dev/github.com/caddyserver/caddy/v2"><img src="https://img.shields.io/badge/godoc-reference-%23007d9c.svg"></a>
-	<br>
-	<a href="https://x.com/caddyserver" title="@caddyserver on Twitter"><img src="https://img.shields.io/twitter/follow/caddyserver" alt="@caddyserver on Twitter"></a>
-	<a href="https://caddy.community" title="Caddy Forum"><img src="https://img.shields.io/badge/community-forum-ff69b4.svg" alt="Caddy Forum"></a>
-	<br>
-	<a href="https://sourcegraph.com/github.com/caddyserver/caddy?badge" title="Caddy on Sourcegraph"><img src="https://sourcegraph.com/github.com/caddyserver/caddy/-/badge.svg" alt="Caddy on Sourcegraph"></a>
-	<a href="https://cloudsmith.io/~caddy/repos/"><img src="https://img.shields.io/badge/OSS%20hosting%20by-cloudsmith-blue?logo=cloudsmith" alt="Cloudsmith"></a>
-</p>
 <p align="center">
 	<a href="https://github.com/caddyserver/caddy/releases">Releases</a> ·
 	<a href="https://caddyserver.com/docs/">Documentation</a> ·
 	<a href="https://caddy.community">Get Help</a>
 </p>
+<p align="center">
+	<a href="https://github.com/caddyserver/caddy/actions/workflows/ci.yml"><img src="https://github.com/caddyserver/caddy/actions/workflows/ci.yml/badge.svg"></a>
+	&nbsp;
+	<a href="https://www.bestpractices.dev/projects/7141"><img src="https://www.bestpractices.dev/projects/7141/badge"></a>
+	&nbsp;
+	<a href="https://pkg.go.dev/github.com/caddyserver/caddy/v2"><img src="https://img.shields.io/badge/godoc-reference-%23007d9c.svg"></a>
+	&nbsp;
+	<a href="https://x.com/caddyserver" title="@caddyserver on Twitter"><img src="https://img.shields.io/twitter/follow/caddyserver" alt="@caddyserver on Twitter"></a>
+	&nbsp;
+	<a href="https://caddy.community" title="Caddy Forum"><img src="https://img.shields.io/badge/community-forum-ff69b4.svg" alt="Caddy Forum"></a>
+	<br>
+	<a href="https://sourcegraph.com/github.com/caddyserver/caddy?badge" title="Caddy on Sourcegraph"><img src="https://sourcegraph.com/github.com/caddyserver/caddy/-/badge.svg" alt="Caddy on Sourcegraph"></a>
+	&nbsp;
+	<a href="https://cloudsmith.io/~caddy/repos/"><img src="https://img.shields.io/badge/OSS%20hosting%20by-cloudsmith-blue?logo=cloudsmith" alt="Cloudsmith"></a>
+</p>
+<p align="center">
+	<b>Powered by</b>
+	<br>
+	<a href="https://github.com/caddyserver/certmagic">
+		<picture>
+			<source media="(prefers-color-scheme: dark)" srcset="https://user-images.githubusercontent.com/55066419/206946718-740b6371-3df3-4d72-a822-47e4c48af999.png">
+			<source media="(prefers-color-scheme: light)" srcset="https://user-images.githubusercontent.com/1128849/49704830-49d37200-fbd5-11e8-8385-767e0cd033c3.png">
+			<img src="https://user-images.githubusercontent.com/1128849/49704830-49d37200-fbd5-11e8-8385-767e0cd033c3.png" alt="CertMagic" width="250">
+		</picture>
+	</a>
+</p>
 
+<!-- Warp sponsorship requests this section -->
+<div align="center" markdown="1">
+	<hr>
+	<sup>Special thanks to:</sup>
+	<br>
+	<a href="https://go.warp.dev/caddy">
+		<img alt="Warp sponsorship" width="400" src="https://github.com/user-attachments/assets/c8efffde-18c7-4af4-83ed-b1aba2dda394">
+	</a>
 
+### [Warp, built for coding with multiple AI agents](https://go.warp.dev/caddy)
+[Available for MacOS, Linux, & Windows](https://go.warp.dev/caddy)<br>
+</div>
+
+<hr>
 
 ### Menu
 
@@ -44,18 +72,6 @@
 - [Getting help](#getting-help)
 - [About](#about)
 
-<p align="center">
-	<b>Powered by</b>
-	<br>
-	<a href="https://github.com/caddyserver/certmagic">
-		<picture>
-			<source media="(prefers-color-scheme: dark)" srcset="https://user-images.githubusercontent.com/55066419/206946718-740b6371-3df3-4d72-a822-47e4c48af999.png">
-			<source media="(prefers-color-scheme: light)" srcset="https://user-images.githubusercontent.com/1128849/49704830-49d37200-fbd5-11e8-8385-767e0cd033c3.png">
-			<img src="https://user-images.githubusercontent.com/1128849/49704830-49d37200-fbd5-11e8-8385-767e0cd033c3.png" alt="CertMagic" width="250">
-		</picture>
-	</a>
-</p>
-
 
 ## [Features](https://caddyserver.com/features)
 
@@ -117,11 +133,18 @@ username ALL=(ALL:ALL) NOPASSWD: /usr/sbin/setcap
 
 replacing `username` with your actual username. Please be careful and only do this if you know what you are doing! We are only qualified to document how to use Caddy, not Go tooling or your computer, and we are providing these instructions for convenience only; please learn how to use your own computer at your own risk and make any needful adjustments.
 
+Then you can run the tests in all modules or a specific one:
+
+```bash
+$ go test ./...
+$ go test ./modules/caddyhttp/tracing/
+```
+
 ### With version information and/or plugins
 
 Using [our builder tool, `xcaddy`](https://github.com/caddyserver/xcaddy)...
 
-```
+```bash
 $ xcaddy build
 ```
 
@@ -197,6 +220,6 @@ Matthew Holt began developing Caddy in 2014 while studying computer science at B
 - _Project on X: [@caddyserver](https://x.com/caddyserver)_
 - _Author on X: [@mholt6](https://x.com/mholt6)_
 
-Caddy is a project of [ZeroSSL](https://zerossl.com), a Stack Holdings company.
+Caddy is a project of [ZeroSSL](https://zerossl.com), an HID Global company.
 
 Debian package repository hosting is graciously provided by [Cloudsmith](https://cloudsmith.com). Cloudsmith is the only fully hosted, cloud-native, universal package management solution, that enables your organization to create, store and share packages in any format, to any place, with total confidence.

admin.go

@@ -47,6 +47,12 @@ import (
 	"go.uber.org/zap/zapcore"
 )
 
+// testCertMagicStorageOverride is a package-level test hook. Tests may set
+// this variable to provide a temporary certmagic.Storage so that cert
+// management in tests does not hit the real default storage on disk.
+// This must NOT be set in production code.
+var testCertMagicStorageOverride certmagic.Storage
+
 func init() {
 	// The hard-coded default `DefaultAdminListen` can be overridden
 	// by setting the `CADDY_ADMIN` environment variable.
@@ -633,8 +639,19 @@ func (ident *IdentityConfig) certmagicConfig(logger *zap.Logger, makeCache bool)
 		// certmagic config, although it'll be mostly useless for remote management
 		ident = new(IdentityConfig)
 	}
+	// Choose storage: prefer the package-level test override when present,
+	// otherwise use the configured DefaultStorage. Tests may set an override
+	// to divert storage into a temporary location. Otherwise, in production
+	// we use the DefaultStorage since we don't want to act as part of a
+	// cluster; this storage is for the server's local identity only.
+	var storage certmagic.Storage
+	if testCertMagicStorageOverride != nil {
+		storage = testCertMagicStorageOverride
+	} else {
+		storage = DefaultStorage
+	}
 	template := certmagic.Config{
-		Storage: DefaultStorage, // do not act as part of a cluster (this is for the server's local identity)
+		Storage: storage,
 		Logger:  logger,
 		Issuers: ident.issuers,
 	}
@@ -732,10 +749,14 @@ func stopAdminServer(srv *http.Server) error {
 	if srv == nil {
 		return fmt.Errorf("no admin server")
 	}
-	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	timeout := 10 * time.Second
+	ctx, cancel := context.WithTimeoutCause(context.Background(), timeout, fmt.Errorf("stopping admin server: %ds timeout", int(timeout.Seconds())))
 	defer cancel()
 	err := srv.Shutdown(ctx)
 	if err != nil {
+		if cause := context.Cause(ctx); cause != nil && errors.Is(err, context.DeadlineExceeded) {
+			err = cause
+		}
 		return fmt.Errorf("shutting down admin server: %v", err)
 	}
 	Log().Named("admin").Info("stopped previous server", zap.String("address", srv.Addr))
@@ -807,13 +828,38 @@ func (h adminHandler) serveHTTP(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
+	// common mitigations in browser contexts
 	if strings.Contains(r.Header.Get("Upgrade"), "websocket") {
 		// I've never been able demonstrate a vulnerability myself, but apparently
 		// WebSocket connections originating from browsers aren't subject to CORS
 		// restrictions, so we'll just be on the safe side
-		h.handleError(w, r, fmt.Errorf("websocket connections aren't allowed"))
+		h.handleError(w, r, APIError{
+			HTTPStatus: http.StatusBadRequest,
+			Err:        errors.New("websocket connections aren't allowed"),
+			Message:    "WebSocket connections aren't allowed.",
+		})
 		return
 	}
+	if strings.Contains(r.Header.Get("Sec-Fetch-Mode"), "no-cors") {
+		// turns out web pages can just disable the same-origin policy (!???!?)
+		// but at least browsers let us know that's the case, holy heck
+		h.handleError(w, r, APIError{
+			HTTPStatus: http.StatusBadRequest,
+			Err:        errors.New("client attempted to make request by disabling same-origin policy using no-cors mode"),
+			Message:    "Disabling same-origin restrictions is not allowed.",
+		})
+		return
+	}
+	if r.Header.Get("Origin") == "null" {
+		// bug in Firefox in certain cross-origin situations (yikes?)
+		// (not strictly a security vuln on its own, but it's red flaggy,
+		// since it seems to manifest in cross-origin contexts)
+		h.handleError(w, r, APIError{
+			HTTPStatus: http.StatusBadRequest,
+			Err:        errors.New("invalid origin 'null'"),
+			Message:    "Buggy browser is sending null Origin header.",
+		})
+	}
 
 	if h.enforceHost {
 		// DNS rebinding mitigation
@@ -824,7 +870,9 @@ func (h adminHandler) serveHTTP(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	if h.enforceOrigin {
+	_, hasOriginHeader := r.Header["Origin"]
+	_, hasSecHeader := r.Header["Sec-Fetch-Mode"]
+	if h.enforceOrigin || hasOriginHeader || hasSecHeader {
 		// cross-site mitigation
 		origin, err := h.checkOrigin(r)
 		if err != nil {
@@ -1110,7 +1158,10 @@ func unsyncedConfigAccess(method, path string, body []byte, out io.Writer) error
 	if len(body) > 0 {
 		err = json.Unmarshal(body, &val)
 		if err != nil {
-			return fmt.Errorf("decoding request body: %v", err)
+			if jsonErr, ok := err.(*json.SyntaxError); ok {
+				return fmt.Errorf("decoding request body: %w, at offset %d", jsonErr, jsonErr.Offset)
+			}
+			return fmt.Errorf("decoding request body: %w", err)
 		}
 	}
 

admin_test.go

@@ -22,9 +22,11 @@ import (
 	"maps"
 	"net/http"
 	"net/http/httptest"
+	"os"
 	"reflect"
 	"sync"
 	"testing"
+	"time"
 
 	"github.com/caddyserver/certmagic"
 	"github.com/prometheus/client_golang/prometheus"
@@ -275,13 +277,12 @@ func TestAdminHandlerBuiltinRouteErrors(t *testing.T) {
 		},
 	}
 
-	err := replaceLocalAdminServer(cfg, Context{})
+	// Build the admin handler directly (no listener active)
+	addr, err := ParseNetworkAddress("localhost:2019")
 	if err != nil {
-		t.Fatalf("setting up admin server: %v", err)
+		t.Fatalf("Failed to parse address: %v", err)
 	}
-	defer func() {
-		stopAdminServer(localAdminServer)
-	}()
+	handler := cfg.Admin.newAdminHandler(addr, false, Context{})
 
 	tests := []struct {
 		name           string
@@ -314,7 +315,7 @@ func TestAdminHandlerBuiltinRouteErrors(t *testing.T) {
 			req := httptest.NewRequest(test.method, fmt.Sprintf("http://localhost:2019%s", test.path), nil)
 			rr := httptest.NewRecorder()
 
-			localAdminServer.Handler.ServeHTTP(rr, req)
+			handler.ServeHTTP(rr, req)
 
 			if rr.Code != test.expectedStatus {
 				t.Errorf("expected status %d but got %d", test.expectedStatus, rr.Code)
@@ -799,8 +800,24 @@ MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDRS0LmTwUT0iwP
 ...
 -----END PRIVATE KEY-----`)
 
-	testStorage := certmagic.FileStorage{Path: t.TempDir()}
-	err := testStorage.Store(context.Background(), "localhost/localhost.crt", certPEM)
+	tmpDir, err := os.MkdirTemp("", "TestManageIdentity-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	testStorage := certmagic.FileStorage{Path: tmpDir}
+	// Clean up the temp dir after the test finishes. Ensure any background
+	// certificate maintenance is stopped first to avoid RemoveAll races.
+	t.Cleanup(func() {
+		if identityCertCache != nil {
+			identityCertCache.Stop()
+			identityCertCache = nil
+		}
+		// Give goroutines a moment to exit and release file handles.
+		time.Sleep(50 * time.Millisecond)
+		_ = os.RemoveAll(tmpDir)
+	})
+
+	err = testStorage.Store(context.Background(), "localhost/localhost.crt", certPEM)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -862,7 +879,7 @@ MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDRS0LmTwUT0iwP
 						},
 					},
 				},
-				storage: &certmagic.FileStorage{Path: "testdata"},
+				storage: &testStorage,
 			},
 			checkState: func(t *testing.T, cfg *Config) {
 				if len(cfg.Admin.Identity.issuers) != 1 {
@@ -900,6 +917,13 @@ MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDRS0LmTwUT0iwP
 				identityCertCache.Stop()
 				identityCertCache = nil
 			}
+			// Ensure any cache started by manageIdentity is stopped at the end
+			defer func() {
+				if identityCertCache != nil {
+					identityCertCache.Stop()
+					identityCertCache = nil
+				}
+			}()
 
 			ctx := Context{
 				Context:         context.Background(),
@@ -907,6 +931,13 @@ MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDRS0LmTwUT0iwP
 				moduleInstances: make(map[string][]Module),
 			}
 
+			// If this test provided a FileStorage, set the package-level
+			// testCertMagicStorageOverride so certmagicConfig will use it.
+			if test.cfg != nil && test.cfg.storage != nil {
+				testCertMagicStorageOverride = test.cfg.storage
+				defer func() { testCertMagicStorageOverride = nil }()
+			}
+
 			err := manageIdentity(ctx, test.cfg)
 
 			if test.wantErr {

caddy.go

@@ -88,7 +88,7 @@ type Config struct {
 	storage      certmagic.Storage
 	eventEmitter eventEmitter
 
-	cancelFunc context.CancelFunc
+	cancelFunc context.CancelCauseFunc
 
 	// fileSystems is a dict of fileSystems that will later be loaded from and added to.
 	fileSystems FileSystems
@@ -147,8 +147,8 @@ func Load(cfgJSON []byte, forceReload bool) error {
 // the new value (if applicable; i.e. "DELETE" doesn't have an input).
 // If the resulting config is the same as the previous, no reload will
 // occur unless forceReload is true. If the config is unchanged and not
-// forcefully reloaded, then errConfigUnchanged This function is safe for
-// concurrent use.
+// forcefully reloaded, then errConfigUnchanged is returned. This function
+// is safe for concurrent use.
 // The ifMatchHeader can optionally be given a string of the format:
 //
 //	"<path> <hash>"
@@ -227,8 +227,18 @@ func changeConfig(method, path string, input []byte, ifMatchHeader string, force
 	idx := make(map[string]string)
 	err = indexConfigObjects(rawCfg[rawConfigKey], "/"+rawConfigKey, idx)
 	if err != nil {
+		if len(rawCfgJSON) > 0 {
+			var oldCfg any
+			err2 := json.Unmarshal(rawCfgJSON, &oldCfg)
+			if err2 != nil {
+				err = fmt.Errorf("%v; additionally, restoring old config: %v", err, err2)
+			}
+			rawCfg[rawConfigKey] = oldCfg
+		} else {
+			rawCfg[rawConfigKey] = nil
+		}
 		return APIError{
-			HTTPStatus: http.StatusInternalServerError,
+			HTTPStatus: http.StatusBadRequest,
 			Err:        fmt.Errorf("indexing config: %v", err),
 		}
 	}
@@ -248,6 +258,8 @@ func changeConfig(method, path string, input []byte, ifMatchHeader string, force
 				err = fmt.Errorf("%v; additionally, restoring old config: %v", err, err2)
 			}
 			rawCfg[rawConfigKey] = oldCfg
+		} else {
+			rawCfg[rawConfigKey] = nil
 		}
 
 		return fmt.Errorf("loading new config: %v", err)
@@ -281,14 +293,19 @@ func indexConfigObjects(ptr any, configPath string, index map[string]string) err
 	case map[string]any:
 		for k, v := range val {
 			if k == idKey {
+				var idStr string
 				switch idVal := v.(type) {
 				case string:
-					index[idVal] = configPath
+					idStr = idVal
 				case float64: // all JSON numbers decode as float64
-					index[fmt.Sprintf("%v", idVal)] = configPath
+					idStr = fmt.Sprintf("%v", idVal)
 				default:
 					return fmt.Errorf("%s: %s field must be a string or number", configPath, idKey)
 				}
+				if existingPath, ok := index[idStr]; ok {
+					return fmt.Errorf("duplicate ID '%s' found at %s and %s", idStr, existingPath, configPath)
+				}
+				index[idStr] = configPath
 				continue
 			}
 			// traverse this object property recursively
@@ -416,7 +433,7 @@ func run(newCfg *Config, start bool) (Context, error) {
 		// partially copied from provisionContext
 		if err != nil {
 			globalMetrics.configSuccess.Set(0)
-			ctx.cfg.cancelFunc()
+			ctx.cfg.cancelFunc(fmt.Errorf("configuration start error: %w", err))
 
 			if currentCtx.cfg != nil {
 				certmagic.Default.Storage = currentCtx.cfg.storage
@@ -492,7 +509,7 @@ func provisionContext(newCfg *Config, replaceAdminServer bool) (Context, error)
 	// cleanup occurs when we return if there
 	// was an error; if no error, it will get
 	// cleaned up on next config cycle
-	ctx, cancel := NewContext(Context{Context: context.Background(), cfg: newCfg})
+	ctx, cancelCause := NewContextWithCause(Context{Context: context.Background(), cfg: newCfg})
 	defer func() {
 		if err != nil {
 			globalMetrics.configSuccess.Set(0)
@@ -501,7 +518,7 @@ func provisionContext(newCfg *Config, replaceAdminServer bool) (Context, error)
 			// since the associated config won't be used;
 			// this will cause all modules that were newly
 			// provisioned to clean themselves up
-			cancel()
+			cancelCause(fmt.Errorf("configuration error: %w", err))
 
 			// also undo any other state changes we made
 			if currentCtx.cfg != nil {
@@ -509,7 +526,7 @@ func provisionContext(newCfg *Config, replaceAdminServer bool) (Context, error)
 			}
 		}
 	}()
-	newCfg.cancelFunc = cancel // clean up later
+	newCfg.cancelFunc = cancelCause // clean up later
 
 	// set up logging before anything bad happens
 	if newCfg.Logging == nil {
@@ -729,7 +746,7 @@ func unsyncedStop(ctx Context) {
 	}
 
 	// clean up all modules
-	ctx.cfg.cancelFunc()
+	ctx.cfg.cancelFunc(fmt.Errorf("stopping apps"))
 }
 
 // Validate loads, provisions, and validates
@@ -737,7 +754,7 @@ func unsyncedStop(ctx Context) {
 func Validate(cfg *Config) error {
 	_, err := run(cfg, false)
 	if err == nil {
-		cfg.cancelFunc() // call Cleanup on all modules
+		cfg.cancelFunc(fmt.Errorf("validation complete")) // call Cleanup on all modules
 	}
 	return err
 }
@@ -945,6 +962,34 @@ func InstanceID() (uuid.UUID, error) {
 // for example.
 var CustomVersion string
 
+// CustomBinaryName is an optional string that overrides the root
+// command name from the default of "caddy". This is useful for
+// downstream projects that embed Caddy but use a different binary
+// name. Shell completions and help text will use this name instead
+// of "caddy".
+//
+// Set this variable during `go build` with `-ldflags`:
+//
+//	-ldflags '-X github.com/caddyserver/caddy/v2.CustomBinaryName=my_custom_caddy'
+//
+// for example.
+var CustomBinaryName string
+
+// CustomLongDescription is an optional string that overrides the
+// long description of the root Cobra command. This is useful for
+// downstream projects that embed Caddy but want different help
+// output.
+//
+// Set this variable in an init() function of a package that is
+// imported by your main:
+//
+//	func init() {
+//	    caddy.CustomLongDescription = "My custom server based on Caddy..."
+//	}
+//
+// for example.
+var CustomLongDescription string
+
 // Version returns the Caddy version in a simple/short form, and
 // a full version string. The short form will not have spaces and
 // is intended for User-Agent strings and similar, but may be
@@ -1092,7 +1137,7 @@ type Event struct {
 }
 
 // NewEvent creates a new event, but does not emit the event. To emit an
-// event, call Emit() on the current instance of the caddyevents app insteaad.
+// event, call Emit() on the current instance of the caddyevents app instead.
 //
 // EXPERIMENTAL: Subject to change.
 func NewEvent(ctx Context, name string, data map[string]any) (Event, error) {
@@ -1250,10 +1295,10 @@ func getLastConfig() (file, adapter string, fn reloadFromSourceFunc) {
 
 // lastConfigMatches returns true if the provided source file and/or adapter
 // matches the recorded last-config. Matching rules (in priority order):
-//  1. If srcAdapter is provided and differs from the recorded adapter, no match.
-//  2. If srcFile exactly equals the recorded file, match.
-//  3. If both sides can be made absolute and equal, match.
-//  4. If basenames are equal, match.
+// 1. If srcAdapter is provided and differs from the recorded adapter, no match.
+// 2. If srcFile exactly equals the recorded file, match.
+// 3. If both sides can be made absolute and equal, match.
+// 4. If basenames are equal, match.
 func lastConfigMatches(srcFile, srcAdapter string) bool {
 	lf, la, _ := getLastConfig()
 

caddyconfig/caddyfile/dispenser.go

@@ -270,7 +270,7 @@ func (d *Dispenser) File() string {
 // targets are left unchanged. If all the targets are filled,
 // then true is returned.
 func (d *Dispenser) Args(targets ...*string) bool {
-	for i := 0; i < len(targets); i++ {
+	for i := range targets {
 		if !d.NextArg() {
 			return false
 		}

caddyconfig/caddyfile/formatter.go

@@ -18,6 +18,7 @@ import (
 	"bytes"
 	"io"
 	"slices"
+	"strings"
 	"unicode"
 )
 
@@ -52,17 +53,16 @@ func Format(input []byte) []byte {
 
 		newLines int // count of newlines consumed
 
-		comment bool // whether we're in a comment
-		quoted  bool // whether we're in a quoted segment
-		escaped bool // whether current char is escaped
+		comment bool   // whether we're in a comment
+		quotes  string // encountered quotes ('', '`', '"', '"`', '`"')
+		escaped bool   // whether current char is escaped
 
 		heredoc              heredocState // whether we're in a heredoc
 		heredocEscaped       bool         // whether heredoc is escaped
 		heredocMarker        []rune
 		heredocClosingMarker []rune
 
-		nesting         int // indentation level
-		withinBackquote bool
+		nesting int // indentation level
 	)
 
 	write := func(ch rune) {
@@ -89,12 +89,8 @@ func Format(input []byte) []byte {
 			}
 			panic(err)
 		}
-		if ch == '`' {
-			withinBackquote = !withinBackquote
-		}
-
 		// detect whether we have the start of a heredoc
-		if !quoted && (heredoc == heredocClosed && !heredocEscaped) &&
+		if quotes == "" && (heredoc == heredocClosed && !heredocEscaped) &&
 			space && last == '<' && ch == '<' {
 			write(ch)
 			heredoc = heredocOpening
@@ -180,16 +176,47 @@ func Format(input []byte) []byte {
 			continue
 		}
 
-		if quoted {
+		if ch == '`' {
+			switch quotes {
+			case "\"`":
+				quotes = "\""
+			case "`":
+				quotes = ""
+			case "\"":
+				quotes = "\"`"
+			default:
+				quotes = "`"
+			}
+		}
+
+		if quotes == "\"" {
 			if ch == '"' {
-				quoted = false
+				quotes = ""
 			}
 			write(ch)
 			continue
 		}
 
-		if space && ch == '"' {
-			quoted = true
+		if ch == '"' {
+			switch quotes {
+			case "":
+				if space {
+					quotes = "\""
+				}
+			case "`\"":
+				quotes = "`"
+			case "\"`":
+				quotes = ""
+			}
+		}
+
+		if strings.Contains(quotes, "`") {
+			if ch == '`' && space && !beginningOfLine {
+				write(' ')
+			}
+			write(ch)
+			space = false
+			continue
 		}
 
 		if unicode.IsSpace(ch) {
@@ -245,7 +272,7 @@ func Format(input []byte) []byte {
 				write(' ')
 			}
 			openBraceWritten = false
-			if withinBackquote {
+			if quotes == "`" {
 				write('{')
 				openBraceWritten = true
 				continue
@@ -253,7 +280,7 @@ func Format(input []byte) []byte {
 			continue
 
 		case ch == '}' && (spacePrior || !openBrace):
-			if withinBackquote {
+			if quotes == "`" {
 				write('}')
 				continue
 			}

caddyconfig/caddyfile/formatter_test.go

@@ -444,6 +444,11 @@ block2 {
 			input:       "block {respond \"All braces should remain: {{now | date `2006`}}\"}",
 			expect:      "block {respond \"All braces should remain: {{now | date `2006`}}\"}",
 		},
+		{
+			description: "Preserve quoted backticks and backticked quotes",
+			input:       "block { respond \"`\" } block { respond `\"`}",
+			expect:      "block {\n\trespond \"`\"\n}\n\nblock {\n\trespond `\"`\n}",
+		},
 		{
 			description: "No trailing space on line before env variable",
 			input: `{
@@ -459,6 +464,17 @@ block2 {
 }
 `,
 		},
+		{
+			description: "issue #7425: multiline backticked string indentation",
+			input: `https://localhost:8953 {
+    respond ` + "`" + `Here are some random numbers:
+
+{{randNumeric 16}}
+
+Hope this helps.` + "`" + `
+}`,
+			expect: "https://localhost:8953 {\n\trespond `Here are some random numbers:\n\n{{randNumeric 16}}\n\nHope this helps.`\n}",
+		},
 	} {
 		// the formatter should output a trailing newline,
 		// even if the tests aren't written to expect that

caddyconfig/caddyfile/parse.go

@@ -507,7 +507,7 @@ func (p *parser) doImport(nesting int) error {
 		// format, won't check for nesting correctness or any other error, that's what parser does.
 		if !maybeSnippet && nesting == 0 {
 			// first of the line
-			if i == 0 || isNextOnNewLine(tokensCopy[i-1], token) {
+			if i == 0 || isNextOnNewLine(tokensCopy[len(tokensCopy)-1], token) {
 				index = 0
 			} else {
 				index++
@@ -616,7 +616,7 @@ func (p *parser) doSingleImport(importFile string) ([]Token, error) {
 	if err != nil {
 		return nil, p.Errf("Failed to get absolute path of file: %s: %v", importFile, err)
 	}
-	for i := 0; i < len(importedTokens); i++ {
+	for i := range importedTokens {
 		importedTokens[i].File = filename
 	}
 
@@ -761,7 +761,7 @@ type ServerBlock struct {
 }
 
 func (sb ServerBlock) GetKeysText() []string {
-	res := []string{}
+	res := make([]string, 0, len(sb.Keys))
 	for _, k := range sb.Keys {
 		res = append(res, k.Text)
 	}

caddyconfig/configadapters.go

@@ -81,7 +81,11 @@ func JSONModuleObject(val any, fieldName, fieldVal string, warnings *[]Warning)
 	err = json.Unmarshal(enc, &tmp)
 	if err != nil {
 		if warnings != nil {
-			*warnings = append(*warnings, Warning{Message: err.Error()})
+			message := err.Error()
+			if jsonErr, ok := err.(*json.SyntaxError); ok {
+				message = fmt.Sprintf("%v, at offset %d", jsonErr.Error(), jsonErr.Offset)
+			}
+			*warnings = append(*warnings, Warning{Message: message})
 		}
 		return nil
 	}

caddyconfig/httpcaddyfile/builtins.go

@@ -113,6 +113,7 @@ func parseBind(h Helper) ([]ConfigValue, error) {
 //	    issuer                        <module_name> [...]
 //	    get_certificate               <module_name> [...]
 //	    insecure_secrets_log          <log_file>
+//	    renewal_window_ratio          <ratio>
 //	}
 func parseTLS(h Helper) ([]ConfigValue, error) {
 	h.Next() // consume directive name
@@ -129,6 +130,7 @@ func parseTLS(h Helper) ([]ConfigValue, error) {
 	var onDemand bool
 	var reusePrivateKeys bool
 	var forceAutomate bool
+	var renewalWindowRatio float64
 
 	// Track which DNS challenge options are set
 	var dnsOptionsSet []string
@@ -473,6 +475,20 @@ func parseTLS(h Helper) ([]ConfigValue, error) {
 			}
 			cp.InsecureSecretsLog = h.Val()
 
+		case "renewal_window_ratio":
+			arg := h.RemainingArgs()
+			if len(arg) != 1 {
+				return nil, h.ArgErr()
+			}
+			ratio, err := strconv.ParseFloat(arg[0], 64)
+			if err != nil {
+				return nil, h.Errf("parsing renewal_window_ratio: %v", err)
+			}
+			if ratio <= 0 || ratio >= 1 {
+				return nil, h.Errf("renewal_window_ratio must be between 0 and 1 (exclusive)")
+			}
+			renewalWindowRatio = ratio
+
 		default:
 			return nil, h.Errf("unknown subdirective: %s", h.Val())
 		}
@@ -597,6 +613,14 @@ func parseTLS(h Helper) ([]ConfigValue, error) {
 		})
 	}
 
+	// renewal window ratio
+	if renewalWindowRatio > 0 {
+		configVals = append(configVals, ConfigValue{
+			Class: "tls.renewal_window_ratio",
+			Value: renewalWindowRatio,
+		})
+	}
+
 	// if enabled, the names in the site addresses will be
 	// added to the automation policies
 	if forceAutomate {
@@ -930,6 +954,7 @@ func parseLogHelper(h Helper, globalLogNames map[string]struct{}) ([]ConfigValue
 	// modifications to the parsing behavior.
 	parseAsGlobalOption := globalLogNames != nil
 
+	// nolint:prealloc
 	var configValues []ConfigValue
 
 	// Logic below expects that a name is always present when a

caddyconfig/httpcaddyfile/httptype.go

@@ -822,7 +822,7 @@ func (st *ServerType) serversFromPairings(
 				// https://caddy.community/t/making-sense-of-auto-https-and-why-disabling-it-still-serves-https-instead-of-http/9761
 				createdTLSConnPolicies, ok := sblock.pile["tls.connection_policy"]
 				hasTLSEnabled := (ok && len(createdTLSConnPolicies) > 0) ||
-					(addr.Host != "" && srv.AutoHTTPS != nil && !slices.Contains(srv.AutoHTTPS.Skip, addr.Host))
+					(addr.Host != "" && (srv.AutoHTTPS == nil || !slices.Contains(srv.AutoHTTPS.Skip, addr.Host)))
 
 				// we'll need to remember if the address qualifies for auto-HTTPS, so we
 				// can add a TLS conn policy if necessary
@@ -851,6 +851,20 @@ func (st *ServerType) serversFromPairings(
 				srv.ListenerWrappersRaw = append(srv.ListenerWrappersRaw, jsonListenerWrapper)
 			}
 
+			// Look for any config values that provide packet conn wrappers on the server block
+			for _, listenerConfig := range sblock.pile["packet_conn_wrapper"] {
+				packetConnWrapper, ok := listenerConfig.Value.(caddy.PacketConnWrapper)
+				if !ok {
+					return nil, fmt.Errorf("config for a packet conn wrapper did not provide a value that implements caddy.PacketConnWrapper")
+				}
+				jsonPacketConnWrapper := caddyconfig.JSONModuleObject(
+					packetConnWrapper,
+					"wrapper",
+					packetConnWrapper.(caddy.Module).CaddyModule().ID.Name(),
+					warnings)
+				srv.PacketConnWrappersRaw = append(srv.PacketConnWrappersRaw, jsonPacketConnWrapper)
+			}
+
 			// set up each handler directive, making sure to honor directive order
 			dirRoutes := sblock.pile["route"]
 			siteSubroute, err := buildSubroute(dirRoutes, groupCounter, true)

caddyconfig/httpcaddyfile/httptype_test.go

@@ -1,9 +1,11 @@
 package httpcaddyfile
 
 import (
+	"encoding/json"
 	"testing"
 
 	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
+	"github.com/caddyserver/caddy/v2/modules/caddyhttp"
 )
 
 func TestMatcherSyntax(t *testing.T) {
@@ -209,3 +211,53 @@ func TestGlobalOptions(t *testing.T) {
 		}
 	}
 }
+
+func TestDefaultSNIWithoutHTTPS(t *testing.T) {
+	caddyfileStr := `{
+		default_sni my-sni.com
+	}
+	example.com {
+	}`
+
+	adapter := caddyfile.Adapter{
+		ServerType: ServerType{},
+	}
+
+	result, _, err := adapter.Adapt([]byte(caddyfileStr), nil)
+	if err != nil {
+		t.Fatalf("Failed to adapt Caddyfile: %v", err)
+	}
+
+	var config struct {
+		Apps struct {
+			HTTP struct {
+				Servers map[string]*caddyhttp.Server `json:"servers"`
+			} `json:"http"`
+		} `json:"apps"`
+	}
+
+	if err := json.Unmarshal(result, &config); err != nil {
+		t.Fatalf("Failed to unmarshal JSON config: %v", err)
+	}
+
+	server, ok := config.Apps.HTTP.Servers["srv0"]
+	if !ok {
+		t.Fatalf("Expected server 'srv0' to be created")
+	}
+
+	if len(server.TLSConnPolicies) == 0 {
+		t.Fatalf("Expected TLS connection policies to be generated, got none")
+	}
+
+	found := false
+	for _, policy := range server.TLSConnPolicies {
+		if policy.DefaultSNI == "my-sni.com" {
+			found = true
+			break
+		}
+	}
+
+	if !found {
+		t.Errorf("Expected default_sni 'my-sni.com' in TLS connection policies, but it was missing. Generated JSON: %s", string(result))
+	}
+}

caddyconfig/httpcaddyfile/options.go

@@ -64,7 +64,9 @@ func init() {
 	RegisterGlobalOption("preferred_chains", parseOptPreferredChains)
 	RegisterGlobalOption("persist_config", parseOptPersistConfig)
 	RegisterGlobalOption("dns", parseOptDNS)
+	RegisterGlobalOption("tls_resolvers", parseOptTLSResolvers)
 	RegisterGlobalOption("ech", parseOptECH)
+	RegisterGlobalOption("renewal_window_ratio", parseOptRenewalWindowRatio)
 }
 
 func parseOptTrue(d *caddyfile.Dispenser, _ any) (any, error) { return true, nil }
@@ -305,6 +307,15 @@ func parseOptSingleString(d *caddyfile.Dispenser, _ any) (any, error) {
 	return val, nil
 }
 
+func parseOptTLSResolvers(d *caddyfile.Dispenser, _ any) (any, error) {
+	d.Next() // consume option name
+	resolvers := d.RemainingArgs()
+	if len(resolvers) == 0 {
+		return nil, d.ArgErr()
+	}
+	return resolvers, nil
+}
+
 func parseOptDefaultBind(d *caddyfile.Dispenser, _ any) (any, error) {
 	d.Next() // consume option name
 
@@ -457,9 +468,8 @@ func parseOptAutoHTTPS(d *caddyfile.Dispenser, _ any) (any, error) {
 		case "disable_redirects":
 		case "disable_certs":
 		case "ignore_loaded_certs":
-		case "prefer_wildcard":
 		default:
-			return "", d.Errf("auto_https must be one of 'off', 'disable_redirects', 'disable_certs', 'ignore_loaded_certs', or 'prefer_wildcard'")
+			return "", d.Errf("auto_https must be one of 'off', 'disable_redirects', 'disable_certs', or 'ignore_loaded_certs'")
 		}
 	}
 	return val, nil
@@ -472,6 +482,8 @@ func unmarshalCaddyfileMetricsOptions(d *caddyfile.Dispenser) (any, error) {
 		switch d.Val() {
 		case "per_host":
 			metrics.PerHost = true
+		case "observe_catchall_hosts":
+			metrics.ObserveCatchallHosts = true
 		default:
 			return nil, d.Errf("unrecognized servers option '%s'", d.Val())
 		}
@@ -623,3 +635,22 @@ func parseOptECH(d *caddyfile.Dispenser, _ any) (any, error) {
 
 	return ech, nil
 }
+
+func parseOptRenewalWindowRatio(d *caddyfile.Dispenser, _ any) (any, error) {
+	d.Next() // consume option name
+	if !d.Next() {
+		return 0, d.ArgErr()
+	}
+	val := d.Val()
+	ratio, err := strconv.ParseFloat(val, 64)
+	if err != nil {
+		return 0, d.Errf("parsing renewal_window_ratio: %v", err)
+	}
+	if ratio <= 0 || ratio >= 1 {
+		return 0, d.Errf("renewal_window_ratio must be between 0 and 1 (exclusive)")
+	}
+	if d.Next() {
+		return 0, d.ArgErr()
+	}
+	return ratio, nil
+}

caddyconfig/httpcaddyfile/options_test.go

@@ -1,9 +1,11 @@
 package httpcaddyfile
 
 import (
+	"encoding/json"
 	"testing"
 
 	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
+	"github.com/caddyserver/caddy/v2/modules/caddytls"
 	_ "github.com/caddyserver/caddy/v2/modules/logging"
 )
 
@@ -62,3 +64,105 @@ func TestGlobalLogOptionSyntax(t *testing.T) {
 		}
 	}
 }
+
+func TestGlobalResolversOption(t *testing.T) {
+	tests := []struct {
+		name            string
+		input           string
+		expectResolvers []string
+		expectError     bool
+	}{
+		{
+			name: "single resolver",
+			input: `{
+				tls_resolvers 1.1.1.1
+			}
+			example.com {
+			}`,
+			expectResolvers: []string{"1.1.1.1"},
+			expectError:     false,
+		},
+		{
+			name: "two resolvers",
+			input: `{
+				tls_resolvers 1.1.1.1 8.8.8.8
+			}
+			example.com {
+			}`,
+			expectResolvers: []string{"1.1.1.1", "8.8.8.8"},
+			expectError:     false,
+		},
+		{
+			name: "multiple resolvers",
+			input: `{
+				tls_resolvers 1.1.1.1 8.8.8.8 9.9.9.9
+			}
+			example.com {
+			}`,
+			expectResolvers: []string{"1.1.1.1", "8.8.8.8", "9.9.9.9"},
+			expectError:     false,
+		},
+		{
+			name: "no resolvers specified",
+			input: `{
+			}
+			example.com {
+			}`,
+			expectResolvers: nil,
+			expectError:     false,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			adapter := caddyfile.Adapter{
+				ServerType: ServerType{},
+			}
+
+			out, _, err := adapter.Adapt([]byte(tc.input), nil)
+
+			if (err != nil) != tc.expectError {
+				t.Errorf("error expectation failed. Expected error: %v, got: %v", tc.expectError, err)
+				return
+			}
+
+			if tc.expectError {
+				return
+			}
+
+			// Parse the output JSON to check resolvers
+			var config struct {
+				Apps struct {
+					TLS *caddytls.TLS `json:"tls"`
+				} `json:"apps"`
+			}
+
+			if err := json.Unmarshal(out, &config); err != nil {
+				t.Errorf("failed to unmarshal output: %v", err)
+				return
+			}
+
+			// Check if resolvers match expected
+			if config.Apps.TLS == nil {
+				if tc.expectResolvers != nil {
+					t.Errorf("Expected TLS config with resolvers %v, but TLS config is nil", tc.expectResolvers)
+				}
+				return
+			}
+
+			actualResolvers := config.Apps.TLS.Resolvers
+			if len(tc.expectResolvers) == 0 && len(actualResolvers) == 0 {
+				return // Both empty, ok
+			}
+			if len(actualResolvers) != len(tc.expectResolvers) {
+				t.Errorf("Expected %d resolvers, got %d. Expected: %v, got: %v", len(tc.expectResolvers), len(actualResolvers), tc.expectResolvers, actualResolvers)
+				return
+			}
+			for j, expected := range tc.expectResolvers {
+				if actualResolvers[j] != expected {
+					t.Errorf("Resolver %d mismatch. Expected: %s, got: %s", j, expected, actualResolvers[j])
+				}
+			}
+		})
+	}
+}

caddyconfig/httpcaddyfile/pkiapp.go

@@ -16,6 +16,7 @@ package httpcaddyfile
 
 import (
 	"slices"
+	"strconv"
 
 	"github.com/caddyserver/caddy/v2"
 	"github.com/caddyserver/caddy/v2/caddyconfig"
@@ -27,14 +28,16 @@ func init() {
 	RegisterGlobalOption("pki", parsePKIApp)
 }
 
-// parsePKIApp parses the global log option. Syntax:
+// parsePKIApp parses the global pki option. Syntax:
 //
 //	pki {
 //	    ca [<id>] {
-//	        name                  <name>
-//	        root_cn               <name>
-//	        intermediate_cn       <name>
-//	        intermediate_lifetime <duration>
+//	        name                    <name>
+//	        root_cn                 <name>
+//	        intermediate_cn         <name>
+//	        intermediate_lifetime   <duration>
+//	        maintenance_interval    <duration>
+//	        renewal_window_ratio    <ratio>
 //	        root {
 //	            cert   <path>
 //	            key    <path>
@@ -99,6 +102,26 @@ func parsePKIApp(d *caddyfile.Dispenser, existingVal any) (any, error) {
 					}
 					pkiCa.IntermediateLifetime = caddy.Duration(dur)
 
+				case "maintenance_interval":
+					if !d.NextArg() {
+						return nil, d.ArgErr()
+					}
+					dur, err := caddy.ParseDuration(d.Val())
+					if err != nil {
+						return nil, err
+					}
+					pkiCa.MaintenanceInterval = caddy.Duration(dur)
+
+				case "renewal_window_ratio":
+					if !d.NextArg() {
+						return nil, d.ArgErr()
+					}
+					ratio, err := strconv.ParseFloat(d.Val(), 64)
+					if err != nil || ratio <= 0 || ratio > 1 {
+						return nil, d.Errf("renewal_window_ratio must be a number in (0, 1], got %s", d.Val())
+					}
+					pkiCa.RenewalWindowRatio = ratio
+
 				case "root":
 					if pkiCa.Root == nil {
 						pkiCa.Root = new(caddypki.KeyPair)

caddyconfig/httpcaddyfile/pkiapp_test.go

@@ -0,0 +1,86 @@
+// Copyright 2015 Matthew Holt and The Caddy Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package httpcaddyfile
+
+import (
+	"encoding/json"
+	"testing"
+	"time"
+
+	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
+)
+
+func TestParsePKIApp_maintenanceIntervalAndRenewalWindowRatio(t *testing.T) {
+	input := `{
+		pki {
+			ca local {
+				maintenance_interval 5m
+				renewal_window_ratio 0.15
+			}
+		}
+	}
+	:8080 {
+	}
+	`
+	adapter := caddyfile.Adapter{ServerType: ServerType{}}
+	out, _, err := adapter.Adapt([]byte(input), nil)
+	if err != nil {
+		t.Fatalf("Adapt failed: %v", err)
+	}
+
+	var cfg struct {
+		Apps struct {
+			PKI struct {
+				CertificateAuthorities map[string]struct {
+					MaintenanceInterval int64   `json:"maintenance_interval,omitempty"`
+					RenewalWindowRatio  float64 `json:"renewal_window_ratio,omitempty"`
+				} `json:"certificate_authorities,omitempty"`
+			} `json:"pki,omitempty"`
+		} `json:"apps"`
+	}
+	if err := json.Unmarshal(out, &cfg); err != nil {
+		t.Fatalf("unmarshal config: %v", err)
+	}
+
+	ca, ok := cfg.Apps.PKI.CertificateAuthorities["local"]
+	if !ok {
+		t.Fatal("expected certificate_authorities.local to exist")
+	}
+	wantInterval := 5 * time.Minute.Nanoseconds()
+	if ca.MaintenanceInterval != wantInterval {
+		t.Errorf("maintenance_interval = %d, want %d (5m)", ca.MaintenanceInterval, wantInterval)
+	}
+	if ca.RenewalWindowRatio != 0.15 {
+		t.Errorf("renewal_window_ratio = %v, want 0.15", ca.RenewalWindowRatio)
+	}
+}
+
+func TestParsePKIApp_renewalWindowRatioInvalid(t *testing.T) {
+	input := `{
+		pki {
+			ca local {
+				renewal_window_ratio 1.5
+			}
+		}
+	}
+	:8080 {
+	}
+	`
+	adapter := caddyfile.Adapter{ServerType: ServerType{}}
+	_, _, err := adapter.Adapt([]byte(input), nil)
+	if err == nil {
+		t.Error("expected error for renewal_window_ratio > 1")
+	}
+}

caddyconfig/httpcaddyfile/serveroptions.go

@@ -36,26 +36,30 @@ type serverOptions struct {
 	ListenerAddress string
 
 	// These will all map 1:1 to the caddyhttp.Server struct
-	Name                 string
-	ListenerWrappersRaw  []json.RawMessage
-	ReadTimeout          caddy.Duration
-	ReadHeaderTimeout    caddy.Duration
-	WriteTimeout         caddy.Duration
-	IdleTimeout          caddy.Duration
-	KeepAliveInterval    caddy.Duration
-	KeepAliveIdle        caddy.Duration
-	KeepAliveCount       int
-	MaxHeaderBytes       int
-	EnableFullDuplex     bool
-	Protocols            []string
-	StrictSNIHost        *bool
-	TrustedProxiesRaw    json.RawMessage
-	TrustedProxiesStrict int
-	TrustedProxiesUnix   bool
-	ClientIPHeaders      []string
-	ShouldLogCredentials bool
-	Metrics              *caddyhttp.Metrics
-	Trace                bool // TODO: EXPERIMENTAL
+	Name                  string
+	ListenerWrappersRaw   []json.RawMessage
+	PacketConnWrappersRaw []json.RawMessage
+	ReadTimeout           caddy.Duration
+	ReadHeaderTimeout     caddy.Duration
+	WriteTimeout          caddy.Duration
+	IdleTimeout           caddy.Duration
+	KeepAliveInterval     caddy.Duration
+	KeepAliveIdle         caddy.Duration
+	KeepAliveCount        int
+	MaxHeaderBytes        int
+	EnableFullDuplex      bool
+	Protocols             []string
+	StrictSNIHost         *bool
+	TrustedProxiesRaw     json.RawMessage
+	TrustedProxiesStrict  int
+	TrustedProxiesUnix    bool
+	ClientIPHeaders       []string
+	ShouldLogCredentials  bool
+	Metrics               *caddyhttp.Metrics
+	Trace                 bool // TODO: EXPERIMENTAL
+	// If set, overrides whether QUIC listeners allow 0-RTT (early data).
+	// If nil, the default behavior is used (currently allowed).
+	Allow0RTT *bool
 }
 
 func unmarshalCaddyfileServerOptions(d *caddyfile.Dispenser) (any, error) {
@@ -99,6 +103,26 @@ func unmarshalCaddyfileServerOptions(d *caddyfile.Dispenser) (any, error) {
 				serverOpts.ListenerWrappersRaw = append(serverOpts.ListenerWrappersRaw, jsonListenerWrapper)
 			}
 
+		case "packet_conn_wrappers":
+			for nesting := d.Nesting(); d.NextBlock(nesting); {
+				modID := "caddy.packetconns." + d.Val()
+				unm, err := caddyfile.UnmarshalModule(d, modID)
+				if err != nil {
+					return nil, err
+				}
+				packetConnWrapper, ok := unm.(caddy.PacketConnWrapper)
+				if !ok {
+					return nil, fmt.Errorf("module %s (%T) is not a packet conn wrapper", modID, unm)
+				}
+				jsonPacketConnWrapper := caddyconfig.JSONModuleObject(
+					packetConnWrapper,
+					"wrapper",
+					packetConnWrapper.(caddy.Module).CaddyModule().ID.Name(),
+					nil,
+				)
+				serverOpts.PacketConnWrappersRaw = append(serverOpts.PacketConnWrappersRaw, jsonPacketConnWrapper)
+			}
+
 		case "timeouts":
 			for nesting := d.Nesting(); d.NextBlock(nesting); {
 				switch d.Val() {
@@ -288,6 +312,17 @@ func unmarshalCaddyfileServerOptions(d *caddyfile.Dispenser) (any, error) {
 			}
 			serverOpts.Trace = true
 
+		case "0rtt":
+			// only supports "off" for now
+			if !d.NextArg() {
+				return nil, d.ArgErr()
+			}
+			if d.Val() != "off" {
+				return nil, d.Errf("unsupported 0rtt argument '%s' (only 'off' is supported)", d.Val())
+			}
+			boolVal := false
+			serverOpts.Allow0RTT = &boolVal
+
 		default:
 			return nil, d.Errf("unrecognized servers option '%s'", d.Val())
 		}
@@ -335,6 +370,7 @@ func applyServerOptions(
 
 		// set all the options
 		server.ListenerWrappersRaw = opts.ListenerWrappersRaw
+		server.PacketConnWrappersRaw = opts.PacketConnWrappersRaw
 		server.ReadTimeout = opts.ReadTimeout
 		server.ReadHeaderTimeout = opts.ReadHeaderTimeout
 		server.WriteTimeout = opts.WriteTimeout
@@ -351,6 +387,7 @@ func applyServerOptions(
 		server.TrustedProxiesStrict = opts.TrustedProxiesStrict
 		server.TrustedProxiesUnix = opts.TrustedProxiesUnix
 		server.Metrics = opts.Metrics
+		server.Allow0RTT = opts.Allow0RTT
 		if opts.ShouldLogCredentials {
 			if server.Logs == nil {
 				server.Logs = new(caddyhttp.ServerLogConfig)

caddyconfig/httpcaddyfile/tlsapp.go

@@ -92,26 +92,8 @@ func (st ServerType) buildTLSApp(
 		tlsApp.Automation.Policies = append(tlsApp.Automation.Policies, catchAllAP)
 	}
 
-	var wildcardHosts []string                        // collect all hosts that have a wildcard in them, and aren't HTTP
 	forcedAutomatedNames := make(map[string]struct{}) // explicitly configured to be automated, even if covered by a wildcard
 
-	for _, p := range pairings {
-		var addresses []string
-		for _, addressWithProtocols := range p.addressesWithProtocols {
-			addresses = append(addresses, addressWithProtocols.address)
-		}
-		if !listenersUseAnyPortOtherThan(addresses, httpPort) {
-			continue
-		}
-		for _, sblock := range p.serverBlocks {
-			for _, addr := range sblock.parsedKeys {
-				if strings.HasPrefix(addr.Host, "*.") {
-					wildcardHosts = append(wildcardHosts, addr.Host[2:])
-				}
-			}
-		}
-	}
-
 	for _, p := range pairings {
 		// avoid setting up TLS automation policies for a server that is HTTP-only
 		var addresses []string
@@ -135,12 +117,6 @@ func (st ServerType) buildTLSApp(
 				return nil, warnings, err
 			}
 
-			// make a plain copy so we can compare whether we made any changes
-			apCopy, err := newBaseAutomationPolicy(options, warnings, true)
-			if err != nil {
-				return nil, warnings, err
-			}
-
 			sblockHosts := sblock.hostsFromKeys(false)
 			if len(sblockHosts) == 0 && catchAllAP != nil {
 				ap = catchAllAP
@@ -167,6 +143,12 @@ func (st ServerType) buildTLSApp(
 				ap.KeyType = keyTypeVals[0].Value.(string)
 			}
 
+			if renewalWindowRatioVals, ok := sblock.pile["tls.renewal_window_ratio"]; ok {
+				ap.RenewalWindowRatio = renewalWindowRatioVals[0].Value.(float64)
+			} else if globalRenewalWindowRatio, ok := options["renewal_window_ratio"]; ok {
+				ap.RenewalWindowRatio = globalRenewalWindowRatio.(float64)
+			}
+
 			// certificate issuers
 			if issuerVals, ok := sblock.pile["tls.cert_issuer"]; ok {
 				var issuers []certmagic.Issuer
@@ -253,16 +235,6 @@ func (st ServerType) buildTLSApp(
 			hostsNotHTTP := sblock.hostsFromKeysNotHTTP(httpPort)
 			sort.Strings(hostsNotHTTP) // solely for deterministic test results
 
-			// if the we prefer wildcards and the AP is unchanged,
-			// then we can skip this AP because it should be covered
-			// by an AP with a wildcard
-			if slices.Contains(autoHTTPS, "prefer_wildcard") {
-				if hostsCoveredByWildcard(hostsNotHTTP, wildcardHosts) &&
-					reflect.DeepEqual(ap, apCopy) {
-					continue
-				}
-			}
-
 			// associate our new automation policy with this server block's hosts
 			ap.SubjectsRaw = hostsNotHTTP
 
@@ -362,6 +334,11 @@ func (st ServerType) buildTLSApp(
 		tlsApp.DNSRaw = caddyconfig.JSONModuleObject(globalDNS, "name", globalDNS.(caddy.Module).CaddyModule().ID.Name(), nil)
 	}
 
+	// set up "global" (to the TLS app) DNS resolvers config
+	if globalResolvers, ok := options["tls_resolvers"]; ok && globalResolvers != nil {
+		tlsApp.Resolvers = globalResolvers.([]string)
+	}
+
 	// set up ECH from Caddyfile options
 	if ech, ok := options["ech"].(*caddytls.ECH); ok {
 		tlsApp.EncryptedClientHello = ech
@@ -576,9 +553,8 @@ func fillInGlobalACMEDefaults(issuer certmagic.Issuer, options map[string]any) e
 		if acmeIssuer.Challenges.DNS == nil {
 			acmeIssuer.Challenges.DNS = new(caddytls.DNSChallengeConfig)
 		}
-		// If global `dns` is set, do NOT set provider in issuer, just set empty dns config
-		if globalDNS == nil && acmeIssuer.Challenges.DNS.ProviderRaw == nil {
-			// Set a global DNS provider if `acme_dns` is set and `dns` is NOT set
+		if globalACMEDNS != nil && acmeIssuer.Challenges.DNS.ProviderRaw == nil {
+			// Set a global DNS provider if `acme_dns` is set
 			acmeIssuer.Challenges.DNS.ProviderRaw = caddyconfig.JSONModuleObject(globalACMEDNS, "name", globalACMEDNS.(caddy.Module).CaddyModule().ID.Name(), nil)
 		}
 	}
@@ -624,6 +600,15 @@ func fillInGlobalACMEDefaults(issuer certmagic.Issuer, options map[string]any) e
 	if globalCertLifetime != nil && acmeIssuer.CertificateLifetime == 0 {
 		acmeIssuer.CertificateLifetime = globalCertLifetime.(caddy.Duration)
 	}
+	// apply global resolvers if DNS challenge is configured and resolvers are not already set
+	globalResolvers := options["tls_resolvers"]
+	if globalResolvers != nil && acmeIssuer.Challenges != nil && acmeIssuer.Challenges.DNS != nil {
+		// Check if DNS challenge is actually configured
+		hasDNSChallenge := globalACMEDNSok || acmeIssuer.Challenges.DNS.ProviderRaw != nil
+		if hasDNSChallenge && len(acmeIssuer.Challenges.DNS.Resolvers) == 0 {
+			acmeIssuer.Challenges.DNS.Resolvers = globalResolvers.([]string)
+		}
+	}
 	return nil
 }
 
@@ -641,7 +626,8 @@ func newBaseAutomationPolicy(
 	_, hasLocalCerts := options["local_certs"]
 	keyType, hasKeyType := options["key_type"]
 	ocspStapling, hasOCSPStapling := options["ocsp_stapling"]
-	hasGlobalAutomationOpts := hasIssuers || hasLocalCerts || hasKeyType || hasOCSPStapling
+	renewalWindowRatio, hasRenewalWindowRatio := options["renewal_window_ratio"]
+	hasGlobalAutomationOpts := hasIssuers || hasLocalCerts || hasKeyType || hasOCSPStapling || hasRenewalWindowRatio
 
 	globalACMECA := options["acme_ca"]
 	globalACMECARoot := options["acme_ca_root"]
@@ -688,6 +674,10 @@ func newBaseAutomationPolicy(
 		ap.OCSPOverrides = ocspConfig.ResponderOverrides
 	}
 
+	if hasRenewalWindowRatio {
+		ap.RenewalWindowRatio = renewalWindowRatio.(float64)
+	}
+
 	return ap, nil
 }
 
@@ -849,20 +839,3 @@ func automationPolicyHasAllPublicNames(ap *caddytls.AutomationPolicy) bool {
 func isTailscaleDomain(name string) bool {
 	return strings.HasSuffix(strings.ToLower(name), ".ts.net")
 }
-
-func hostsCoveredByWildcard(hosts []string, wildcards []string) bool {
-	if len(hosts) == 0 || len(wildcards) == 0 {
-		return false
-	}
-	for _, host := range hosts {
-		for _, wildcard := range wildcards {
-			if strings.HasPrefix(host, "*.") {
-				continue
-			}
-			if certmagic.MatchWildcard(host, "*."+wildcard) {
-				return true
-			}
-		}
-	}
-	return false
-}

caddyconfig/httploader.go

@@ -136,7 +136,7 @@ func (hl HTTPLoader) LoadConfig(ctx caddy.Context) ([]byte, error) {
 }
 
 func attemptHttpCall(client *http.Client, request *http.Request) (*http.Response, error) {
-	resp, err := client.Do(request)
+	resp, err := client.Do(request) //nolint:gosec // no SSRF; comes from trusted config
 	if err != nil {
 		return nil, fmt.Errorf("problem calling http loader url: %v", err)
 	} else if resp.StatusCode < 200 || resp.StatusCode > 499 {
@@ -151,7 +151,7 @@ func doHttpCallWithRetries(ctx caddy.Context, client *http.Client, request *http
 	var err error
 	const maxAttempts = 10
 
-	for i := 0; i < maxAttempts; i++ {
+	for i := range maxAttempts {
 		resp, err = attemptHttpCall(client, request)
 		if err != nil && i < maxAttempts-1 {
 			select {

caddyconfig/load.go

@@ -106,7 +106,7 @@ func (adminLoad) handleLoad(w http.ResponseWriter, r *http.Request) error {
 			if err != nil {
 				caddy.Log().Named("admin.api.load").Error(err.Error())
 			}
-			_, _ = w.Write(respBody)
+			_, _ = w.Write(respBody) //nolint:gosec // false positive: no XSS here
 		}
 		body = result
 	}

caddytest/caddytest.go

@@ -187,7 +187,7 @@ func (tc *Tester) initServer(rawConfig string, configType string) error {
 		req.Header.Add("Content-Type", "text/"+configType)
 	}
 
-	res, err := client.Do(req)
+	res, err := client.Do(req) //nolint:gosec // no SSRF because URL is hard-coded to localhost, and port comes from config
 	if err != nil {
 		tc.t.Errorf("unable to contact caddy server. %s", err)
 		return err
@@ -279,7 +279,7 @@ func validateTestPrerequisites(tc *Tester) error {
 			return err
 		}
 		tc.t.Cleanup(func() {
-			os.Remove(f.Name())
+			os.Remove(f.Name()) //nolint:gosec // false positive, filename comes from std lib, no path traversal
 		})
 		if _, err := fmt.Fprintf(f, initConfig, tc.config.AdminPort); err != nil {
 			return err
@@ -362,6 +362,8 @@ func CreateTestingTransport() *http.Transport {
 
 // AssertLoadError will load a config and expect an error
 func AssertLoadError(t *testing.T, rawConfig string, configType string, expectedError string) {
+	t.Helper()
+
 	tc := NewTester(t)
 
 	err := tc.initServer(rawConfig, configType)
@@ -372,6 +374,8 @@ func AssertLoadError(t *testing.T, rawConfig string, configType string, expected
 
 // AssertRedirect makes a request and asserts the redirection happens
 func (tc *Tester) AssertRedirect(requestURI string, expectedToLocation string, expectedStatusCode int) *http.Response {
+	tc.t.Helper()
+
 	redirectPolicyFunc := func(req *http.Request, via []*http.Request) error {
 		return http.ErrUseLastResponse
 	}
@@ -409,6 +413,8 @@ func (tc *Tester) AssertRedirect(requestURI string, expectedToLocation string, e
 
 // CompareAdapt adapts a config and then compares it against an expected result
 func CompareAdapt(t testing.TB, filename, rawConfig string, adapterName string, expectedResponse string) bool {
+	t.Helper()
+
 	cfgAdapter := caddyconfig.GetAdapter(adapterName)
 	if cfgAdapter == nil {
 		t.Logf("unrecognized config adapter '%s'", adapterName)
@@ -468,6 +474,8 @@ func CompareAdapt(t testing.TB, filename, rawConfig string, adapterName string,
 
 // AssertAdapt adapts a config and then tests it against an expected result
 func AssertAdapt(t testing.TB, rawConfig string, adapterName string, expectedResponse string) {
+	t.Helper()
+
 	ok := CompareAdapt(t, "Caddyfile", rawConfig, adapterName, expectedResponse)
 	if !ok {
 		t.Fail()
@@ -496,7 +504,9 @@ func applyHeaders(t testing.TB, req *http.Request, requestHeaders []string) {
 
 // AssertResponseCode will execute the request and verify the status code, returns a response for additional assertions
 func (tc *Tester) AssertResponseCode(req *http.Request, expectedStatusCode int) *http.Response {
-	resp, err := tc.Client.Do(req)
+	tc.t.Helper()
+
+	resp, err := tc.Client.Do(req) //nolint:gosec // no SSRFs demonstrated
 	if err != nil {
 		tc.t.Fatalf("failed to call server %s", err)
 	}
@@ -510,6 +520,8 @@ func (tc *Tester) AssertResponseCode(req *http.Request, expectedStatusCode int)
 
 // AssertResponse request a URI and assert the status code and the body contains a string
 func (tc *Tester) AssertResponse(req *http.Request, expectedStatusCode int, expectedBody string) (*http.Response, string) {
+	tc.t.Helper()
+
 	resp := tc.AssertResponseCode(req, expectedStatusCode)
 
 	defer resp.Body.Close()
@@ -531,6 +543,8 @@ func (tc *Tester) AssertResponse(req *http.Request, expectedStatusCode int, expe
 
 // AssertGetResponse GET a URI and expect a statusCode and body text
 func (tc *Tester) AssertGetResponse(requestURI string, expectedStatusCode int, expectedBody string) (*http.Response, string) {
+	tc.t.Helper()
+
 	req, err := http.NewRequest("GET", requestURI, nil)
 	if err != nil {
 		tc.t.Fatalf("unable to create request %s", err)
@@ -541,6 +555,8 @@ func (tc *Tester) AssertGetResponse(requestURI string, expectedStatusCode int, e
 
 // AssertDeleteResponse request a URI and expect a statusCode and body text
 func (tc *Tester) AssertDeleteResponse(requestURI string, expectedStatusCode int, expectedBody string) (*http.Response, string) {
+	tc.t.Helper()
+
 	req, err := http.NewRequest("DELETE", requestURI, nil)
 	if err != nil {
 		tc.t.Fatalf("unable to create request %s", err)
@@ -551,6 +567,8 @@ func (tc *Tester) AssertDeleteResponse(requestURI string, expectedStatusCode int
 
 // AssertPostResponseBody POST to a URI and assert the response code and body
 func (tc *Tester) AssertPostResponseBody(requestURI string, requestHeaders []string, requestBody *bytes.Buffer, expectedStatusCode int, expectedBody string) (*http.Response, string) {
+	tc.t.Helper()
+
 	req, err := http.NewRequest("POST", requestURI, requestBody)
 	if err != nil {
 		tc.t.Errorf("failed to create request %s", err)
@@ -564,6 +582,8 @@ func (tc *Tester) AssertPostResponseBody(requestURI string, requestHeaders []str
 
 // AssertPutResponseBody PUT to a URI and assert the response code and body
 func (tc *Tester) AssertPutResponseBody(requestURI string, requestHeaders []string, requestBody *bytes.Buffer, expectedStatusCode int, expectedBody string) (*http.Response, string) {
+	tc.t.Helper()
+
 	req, err := http.NewRequest("PUT", requestURI, requestBody)
 	if err != nil {
 		tc.t.Errorf("failed to create request %s", err)
@@ -577,6 +597,8 @@ func (tc *Tester) AssertPutResponseBody(requestURI string, requestHeaders []stri
 
 // AssertPatchResponseBody PATCH to a URI and assert the response code and body
 func (tc *Tester) AssertPatchResponseBody(requestURI string, requestHeaders []string, requestBody *bytes.Buffer, expectedStatusCode int, expectedBody string) (*http.Response, string) {
+	tc.t.Helper()
+
 	req, err := http.NewRequest("PATCH", requestURI, requestBody)
 	if err != nil {
 		tc.t.Errorf("failed to create request %s", err)

caddytest/caddytest_test.go

@@ -1,6 +1,7 @@
 package caddytest
 
 import (
+	"bytes"
 	"net/http"
 	"strings"
 	"testing"
@@ -126,3 +127,118 @@ func TestLoadUnorderedJSON(t *testing.T) {
 	}
 	tester.AssertResponseCode(req, 200)
 }
+
+func TestCheckID(t *testing.T) {
+	tester := NewTester(t)
+	tester.InitServer(`{
+		"admin": {
+			"listen": "localhost:2999"
+		},
+		"apps": {
+			"http": {
+				"http_port": 9080,
+				"servers": {
+					"s_server": {
+						"@id": "s_server",
+						"listen": [
+							":9080"
+						],
+						"routes": [
+							{
+								"handle": [
+									{
+										"handler": "static_response",
+										"body": "Hello"
+									}
+								]
+							}
+						]
+					}
+				}
+			}
+		}
+	}
+	`, "json")
+	headers := []string{"Content-Type:application/json"}
+	sServer1 := []byte(`{"@id":"s_server","listen":[":9080"],"routes":[{"@id":"route1","handle":[{"handler":"static_response","body":"Hello 2"}]}]}`)
+
+	// PUT to an existing ID should fail with a 409 conflict
+	tester.AssertPutResponseBody(
+		"http://localhost:2999/id/s_server",
+		headers,
+		bytes.NewBuffer(sServer1),
+		409,
+		`{"error":"[/config/apps/http/servers/s_server] key already exists: s_server"}`+"\n")
+
+	// POST replaces the object fully
+	tester.AssertPostResponseBody(
+		"http://localhost:2999/id/s_server",
+		headers,
+		bytes.NewBuffer(sServer1),
+		200,
+		"")
+
+	// Verify the server is running the new route
+	tester.AssertGetResponse(
+		"http://localhost:9080/",
+		200,
+		"Hello 2")
+
+	// Update the existing route to ensure IDs are handled correctly when replaced
+	tester.AssertPostResponseBody(
+		"http://localhost:2999/id/s_server",
+		headers,
+		bytes.NewBuffer([]byte(`{"@id":"s_server","listen":[":9080"],"routes":[{"@id":"route1","handle":[{"handler":"static_response","body":"Hello2"}],"match":[{"path":["/route_1/*"]}]}]}`)),
+		200,
+		"")
+
+	sServer2 := []byte(`{"@id":"s_server","listen":[":9080"],"routes":[{"@id":"route1","handle":[{"handler":"static_response","body":"Hello2"}],"match":[{"path":["/route_1/*"]}]}]}`)
+
+	// Identical patch should succeed and return 200 (config is unchanged branch)
+	tester.AssertPatchResponseBody(
+		"http://localhost:2999/id/s_server",
+		headers,
+		bytes.NewBuffer(sServer2),
+		200,
+		"")
+
+	route2 := []byte(`{"@id":"route2","handle": [{"handler": "static_response","body": "route2"}],"match":[{"path":["/route_2/*"]}]}`)
+
+	// Put a new route2 object before the route1 object due to the path of /id/route1
+	// Being translated to: /config/apps/http/servers/s_server/routes/0
+	tester.AssertPutResponseBody(
+		"http://localhost:2999/id/route1",
+		headers,
+		bytes.NewBuffer(route2),
+		200,
+		"")
+
+	// Verify that the whole config looks correct, now containing both route1 and route2
+	tester.AssertGetResponse(
+		"http://localhost:2999/config/",
+		200,
+		`{"admin":{"listen":"localhost:2999"},"apps":{"http":{"http_port":9080,"servers":{"s_server":{"@id":"s_server","listen":[":9080"],"routes":[{"@id":"route2","handle":[{"body":"route2","handler":"static_response"}],"match":[{"path":["/route_2/*"]}]},{"@id":"route1","handle":[{"body":"Hello2","handler":"static_response"}],"match":[{"path":["/route_1/*"]}]}]}}}}}`+"\n")
+
+	// Try to add another copy of route2 using POST to test duplicate ID handling
+	// Since the first route2 ended up at array index 0, and we are appending to the array, the index for the new element would be 2
+	tester.AssertPostResponseBody(
+		"http://localhost:2999/id/route2",
+		headers,
+		bytes.NewBuffer(route2),
+		400,
+		`{"error":"indexing config: duplicate ID 'route2' found at /config/apps/http/servers/s_server/routes/0 and /config/apps/http/servers/s_server/routes/2"}`+"\n")
+
+	// Use PATCH to modify an existing object successfully
+	tester.AssertPatchResponseBody(
+		"http://localhost:2999/id/route1",
+		headers,
+		bytes.NewBuffer([]byte(`{"@id":"route1","handle":[{"handler":"static_response","body":"route1"}],"match":[{"path":["/route_1/*"]}]}`)),
+		200,
+		"")
+
+	// Verify the PATCH updated the server state
+	tester.AssertGetResponse(
+		"http://localhost:9080/route_1/",
+		200,
+		"route1")
+}

caddytest/integration/acme_test.go

@@ -51,7 +51,7 @@ func TestACMEServerWithDefaults(t *testing.T) {
 		Client: &acme.Client{
 			Directory:  "https://acme.localhost:9443/acme/local/directory",
 			HTTPClient: tester.Client,
-			Logger:     slog.New(zapslog.NewHandler(logger.Core())),
+			Logger:     slog.New(zapslog.NewHandler(logger.Core(), zapslog.WithName("acmez"))),
 		},
 		ChallengeSolvers: map[string]acmez.Solver{
 			acme.ChallengeTypeHTTP01: &naiveHTTPSolver{logger: logger},
@@ -120,7 +120,7 @@ func TestACMEServerWithMismatchedChallenges(t *testing.T) {
 		Client: &acme.Client{
 			Directory:  "https://acme.localhost:9443/acme/local/directory",
 			HTTPClient: tester.Client,
-			Logger:     slog.New(zapslog.NewHandler(logger.Core())),
+			Logger:     slog.New(zapslog.NewHandler(logger.Core(), zapslog.WithName("acmez"))),
 		},
 		ChallengeSolvers: map[string]acmez.Solver{
 			acme.ChallengeTypeHTTP01: &naiveHTTPSolver{logger: logger},

caddytest/integration/acmeserver_test.go

@@ -127,7 +127,7 @@ func TestACMEServerAllowPolicy(t *testing.T) {
 		_, err := client.ObtainCertificateForSANs(ctx, account, certPrivateKey, []string{"not-matching.localhost"})
 		if err == nil {
 			t.Errorf("obtaining certificate for 'not-matching.localhost' domain")
-		} else if err != nil && !strings.Contains(err.Error(), "urn:ietf:params:acme:error:rejectedIdentifier") {
+		} else if !strings.Contains(err.Error(), "urn:ietf:params:acme:error:rejectedIdentifier") {
 			t.Logf("unexpected error: %v", err)
 		}
 	}
@@ -200,7 +200,7 @@ func TestACMEServerDenyPolicy(t *testing.T) {
 		_, err := client.ObtainCertificateForSANs(ctx, account, certPrivateKey, []string{"deny.localhost"})
 		if err == nil {
 			t.Errorf("obtaining certificate for 'deny.localhost' domain")
-		} else if err != nil && !strings.Contains(err.Error(), "urn:ietf:params:acme:error:rejectedIdentifier") {
+		} else if !strings.Contains(err.Error(), "urn:ietf:params:acme:error:rejectedIdentifier") {
 			t.Logf("unexpected error: %v", err)
 		}
 	}

caddytest/integration/autohttps_test.go

@@ -143,3 +143,26 @@ func TestAutoHTTPRedirectsInsertedBeforeUserDefinedCatchAllWithNoExplicitHTTPSit
 	tester.AssertGetResponse("http://foo.localhost:9080/", 200, "Foo")
 	tester.AssertGetResponse("http://baz.localhost:9080/", 200, "Foo")
 }
+
+func TestAutoHTTPSRedirectSortingExactMatchOverWildcard(t *testing.T) {
+	tester := caddytest.NewTester(t)
+	tester.InitServer(`
+    {
+        skip_install_trust
+        admin localhost:2999
+        http_port     9080
+        https_port    9443
+        local_certs
+    }
+    *.localhost:10443 {
+        respond "Wildcard"
+    }
+    dev.localhost {
+        respond "Exact"
+    }
+  `, "caddyfile")
+
+	tester.AssertRedirect("http://dev.localhost:9080/", "https://dev.localhost/", http.StatusPermanentRedirect)
+
+	tester.AssertRedirect("http://foo.localhost:9080/", "https://foo.localhost:10443/", http.StatusPermanentRedirect)
+}

caddytest/integration/caddyfile_adapt/forward_auth_authelia.caddyfiletest

@@ -46,6 +46,18 @@ app.example.com {
 																		}
 																	]
 																},
+																{
+																	"handle": [
+																		{
+																			"handler": "headers",
+																			"request": {
+																				"delete": [
+																					"Remote-Email"
+																				]
+																			}
+																		}
+																	]
+																},
 																{
 																	"handle": [
 																		{
@@ -73,6 +85,18 @@ app.example.com {
 																		}
 																	]
 																},
+																{
+																	"handle": [
+																		{
+																			"handler": "headers",
+																			"request": {
+																				"delete": [
+																					"Remote-Groups"
+																				]
+																			}
+																		}
+																	]
+																},
 																{
 																	"handle": [
 																		{
@@ -100,6 +124,18 @@ app.example.com {
 																		}
 																	]
 																},
+																{
+																	"handle": [
+																		{
+																			"handler": "headers",
+																			"request": {
+																				"delete": [
+																					"Remote-Name"
+																				]
+																			}
+																		}
+																	]
+																},
 																{
 																	"handle": [
 																		{
@@ -127,6 +163,18 @@ app.example.com {
 																		}
 																	]
 																},
+																{
+																	"handle": [
+																		{
+																			"handler": "headers",
+																			"request": {
+																				"delete": [
+																					"Remote-User"
+																				]
+																			}
+																		}
+																	]
+																},
 																{
 																	"handle": [
 																		{
@@ -200,4 +248,4 @@ app.example.com {
 			}
 		}
 	}
-}
+}

caddytest/integration/caddyfile_adapt/forward_auth_copy_headers_strip.caddyfiletest

@@ -0,0 +1,146 @@
+:8080
+
+forward_auth 127.0.0.1:9091 {
+	uri /
+	copy_headers X-User-Id X-User-Role
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":8080"
+					],
+					"routes": [
+						{
+							"handle": [
+								{
+									"handle_response": [
+										{
+											"match": {
+												"status_code": [
+													2
+												]
+											},
+											"routes": [
+												{
+													"handle": [
+														{
+															"handler": "vars"
+														}
+													]
+												},
+												{
+													"handle": [
+														{
+															"handler": "headers",
+															"request": {
+																"delete": [
+																	"X-User-Id"
+																]
+															}
+														}
+													]
+												},
+												{
+													"handle": [
+														{
+															"handler": "headers",
+															"request": {
+																"set": {
+																	"X-User-Id": [
+																		"{http.reverse_proxy.header.X-User-Id}"
+																	]
+																}
+															}
+														}
+													],
+													"match": [
+														{
+															"not": [
+																{
+																	"vars": {
+																		"{http.reverse_proxy.header.X-User-Id}": [
+																			""
+																		]
+																	}
+																}
+															]
+														}
+													]
+												},
+												{
+													"handle": [
+														{
+															"handler": "headers",
+															"request": {
+																"delete": [
+																	"X-User-Role"
+																]
+															}
+														}
+													]
+												},
+												{
+													"handle": [
+														{
+															"handler": "headers",
+															"request": {
+																"set": {
+																	"X-User-Role": [
+																		"{http.reverse_proxy.header.X-User-Role}"
+																	]
+																}
+															}
+														}
+													],
+													"match": [
+														{
+															"not": [
+																{
+																	"vars": {
+																		"{http.reverse_proxy.header.X-User-Role}": [
+																			""
+																		]
+																	}
+																}
+															]
+														}
+													]
+												}
+											]
+										}
+									],
+									"handler": "reverse_proxy",
+									"headers": {
+										"request": {
+											"set": {
+												"X-Forwarded-Method": [
+													"{http.request.method}"
+												],
+												"X-Forwarded-Uri": [
+													"{http.request.uri}"
+												]
+											}
+										}
+									},
+									"rewrite": {
+										"method": "GET",
+										"uri": "/"
+									},
+									"upstreams": [
+										{
+											"dial": "127.0.0.1:9091"
+										}
+									]
+								}
+							]
+						}
+					]
+				}
+			}
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/forward_auth_rename_headers.caddyfiletest

@@ -35,6 +35,18 @@ forward_auth localhost:9000 {
 														}
 													]
 												},
+												{
+													"handle": [
+														{
+															"handler": "headers",
+															"request": {
+																"delete": [
+																	"1"
+																]
+															}
+														}
+													]
+												},
 												{
 													"handle": [
 														{
@@ -62,6 +74,18 @@ forward_auth localhost:9000 {
 														}
 													]
 												},
+												{
+													"handle": [
+														{
+															"handler": "headers",
+															"request": {
+																"delete": [
+																	"B"
+																]
+															}
+														}
+													]
+												},
 												{
 													"handle": [
 														{
@@ -89,6 +113,18 @@ forward_auth localhost:9000 {
 														}
 													]
 												},
+												{
+													"handle": [
+														{
+															"handler": "headers",
+															"request": {
+																"delete": [
+																	"3"
+																]
+															}
+														}
+													]
+												},
 												{
 													"handle": [
 														{
@@ -116,6 +152,18 @@ forward_auth localhost:9000 {
 														}
 													]
 												},
+												{
+													"handle": [
+														{
+															"handler": "headers",
+															"request": {
+																"delete": [
+																	"D"
+																]
+															}
+														}
+													]
+												},
 												{
 													"handle": [
 														{
@@ -143,6 +191,18 @@ forward_auth localhost:9000 {
 														}
 													]
 												},
+												{
+													"handle": [
+														{
+															"handler": "headers",
+															"request": {
+																"delete": [
+																	"5"
+																]
+															}
+														}
+													]
+												},
 												{
 													"handle": [
 														{
@@ -203,4 +263,4 @@ forward_auth localhost:9000 {
 			}
 		}
 	}
-}
+}

caddytest/integration/caddyfile_adapt/global_options_resolvers.caddyfiletest

@@ -0,0 +1,77 @@
+{
+	email test@example.com
+	dns mock
+	tls_resolvers 1.1.1.1 8.8.8.8
+	acme_dns
+}
+
+example.com {
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":443"
+					],
+					"routes": [
+						{
+							"match": [
+								{
+									"host": [
+										"example.com"
+									]
+								}
+							],
+							"terminal": true
+						}
+					]
+				}
+			}
+		},
+		"tls": {
+			"automation": {
+				"policies": [
+					{
+						"issuers": [
+							{
+								"challenges": {
+									"dns": {
+										"resolvers": [
+											"1.1.1.1",
+											"8.8.8.8"
+										]
+									}
+								},
+								"email": "test@example.com",
+								"module": "acme"
+							},
+							{
+								"ca": "https://acme.zerossl.com/v2/DV90",
+								"challenges": {
+									"dns": {
+										"resolvers": [
+											"1.1.1.1",
+											"8.8.8.8"
+										]
+									}
+								},
+								"email": "test@example.com",
+								"module": "acme"
+							}
+						]
+					}
+				]
+			},
+			"dns": {
+				"name": "mock"
+			},
+			"resolvers": [
+				"1.1.1.1",
+				"8.8.8.8"
+			]
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/global_options_resolvers_http_challenge.caddyfiletest

@@ -0,0 +1,38 @@
+{
+	tls_resolvers 1.1.1.1 8.8.8.8
+}
+
+example.com {
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":443"
+					],
+					"routes": [
+						{
+							"match": [
+								{
+									"host": [
+										"example.com"
+									]
+								}
+							],
+							"terminal": true
+						}
+					]
+				}
+			}
+		},
+		"tls": {
+			"resolvers": [
+				"1.1.1.1",
+				"8.8.8.8"
+			]
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/global_options_resolvers_local_dns_inherit.caddyfiletest

@@ -0,0 +1,72 @@
+{
+	email test@example.com
+	dns mock
+	tls_resolvers 1.1.1.1 8.8.8.8
+}
+
+example.com {
+	tls {
+		dns mock
+	}
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":443"
+					],
+					"routes": [
+						{
+							"match": [
+								{
+									"host": [
+										"example.com"
+									]
+								}
+							],
+							"terminal": true
+						}
+					]
+				}
+			}
+		},
+		"tls": {
+			"automation": {
+				"policies": [
+					{
+						"subjects": [
+							"example.com"
+						],
+						"issuers": [
+							{
+								"challenges": {
+									"dns": {
+										"provider": {
+											"name": "mock"
+										},
+										"resolvers": [
+											"1.1.1.1",
+											"8.8.8.8"
+										]
+									}
+								},
+								"email": "test@example.com",
+								"module": "acme"
+							}
+						]
+					}
+				]
+			},
+			"dns": {
+				"name": "mock"
+			},
+			"resolvers": [
+				"1.1.1.1",
+				"8.8.8.8"
+			]
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/global_options_resolvers_local_override.caddyfiletest

@@ -0,0 +1,98 @@
+{
+	email test@example.com
+	dns mock
+	tls_resolvers 1.1.1.1 8.8.8.8
+	acme_dns
+}
+
+example.com {
+	tls {
+		resolvers 9.9.9.9
+	}
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":443"
+					],
+					"routes": [
+						{
+							"match": [
+								{
+									"host": [
+										"example.com"
+									]
+								}
+							],
+							"terminal": true
+						}
+					]
+				}
+			}
+		},
+		"tls": {
+			"automation": {
+				"policies": [
+					{
+						"subjects": [
+							"example.com"
+						],
+						"issuers": [
+							{
+								"challenges": {
+									"dns": {
+										"resolvers": [
+											"9.9.9.9"
+										]
+									}
+								},
+								"email": "test@example.com",
+								"module": "acme"
+							}
+						]
+					},
+					{
+						"issuers": [
+							{
+								"challenges": {
+									"dns": {
+										"resolvers": [
+											"1.1.1.1",
+											"8.8.8.8"
+										]
+									}
+								},
+								"email": "test@example.com",
+								"module": "acme"
+							},
+							{
+								"ca": "https://acme.zerossl.com/v2/DV90",
+								"challenges": {
+									"dns": {
+										"resolvers": [
+											"1.1.1.1",
+											"8.8.8.8"
+										]
+									}
+								},
+								"email": "test@example.com",
+								"module": "acme"
+							}
+						]
+					}
+				]
+			},
+			"dns": {
+				"name": "mock"
+			},
+			"resolvers": [
+				"1.1.1.1",
+				"8.8.8.8"
+			]
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/global_options_resolvers_mixed.caddyfiletest

@@ -0,0 +1,112 @@
+{
+	email test@example.com
+	dns mock
+	tls_resolvers 1.1.1.1 8.8.8.8
+	acme_dns
+}
+
+site1.example.com {
+}
+
+site2.example.com {
+	tls {
+		resolvers 9.9.9.9 8.8.4.4
+	}
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":443"
+					],
+					"routes": [
+						{
+							"match": [
+								{
+									"host": [
+										"site1.example.com"
+									]
+								}
+							],
+							"terminal": true
+						},
+						{
+							"match": [
+								{
+									"host": [
+										"site2.example.com"
+									]
+								}
+							],
+							"terminal": true
+						}
+					]
+				}
+			}
+		},
+		"tls": {
+			"automation": {
+				"policies": [
+					{
+						"subjects": [
+							"site2.example.com"
+						],
+						"issuers": [
+							{
+								"challenges": {
+									"dns": {
+										"resolvers": [
+											"9.9.9.9",
+											"8.8.4.4"
+										]
+									}
+								},
+								"email": "test@example.com",
+								"module": "acme"
+							}
+						]
+					},
+					{
+						"issuers": [
+							{
+								"challenges": {
+									"dns": {
+										"resolvers": [
+											"1.1.1.1",
+											"8.8.8.8"
+										]
+									}
+								},
+								"email": "test@example.com",
+								"module": "acme"
+							},
+							{
+								"ca": "https://acme.zerossl.com/v2/DV90",
+								"challenges": {
+									"dns": {
+										"resolvers": [
+											"1.1.1.1",
+											"8.8.8.8"
+										]
+									}
+								},
+								"email": "test@example.com",
+								"module": "acme"
+							}
+						]
+					}
+				]
+			},
+			"dns": {
+				"name": "mock"
+			},
+			"resolvers": [
+				"1.1.1.1",
+				"8.8.8.8"
+			]
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/global_server_options_single.caddyfiletest

@@ -21,6 +21,7 @@
 		keepalive_interval 20s
 		keepalive_idle 20s
 		keepalive_count 10
+		0rtt off
 	}
 }
 
@@ -90,7 +91,8 @@ foo.com {
 						"h2",
 						"h2c",
 						"h3"
-					]
+					],
+					"allow_0rtt": false
 				}
 			}
 		}

caddytest/integration/caddyfile_adapt/import_block_snippet_non_replaced_block_from_separate_file.caddyfiletest

@@ -0,0 +1,52 @@
+import testdata/issue_7518_unused_block_panic_snippets.conf
+
+example.com {
+	import snippet
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":443"
+					],
+					"routes": [
+						{
+							"match": [
+								{
+									"host": [
+										"example.com"
+									]
+								}
+							],
+							"handle": [
+								{
+									"handler": "subroute",
+									"routes": [
+										{
+											"handle": [
+												{
+													"handler": "headers",
+													"response": {
+														"set": {
+															"Reverse_proxy": [
+																"localhost:3000"
+															]
+														}
+													}
+												}
+											]
+										}
+									]
+								}
+							],
+							"terminal": true
+						}
+					]
+				}
+			}
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/log_roll_days.caddyfiletest

@@ -1,27 +1,47 @@
 :80
 
-log {
+log one {
 	output file /var/log/access.log {
+		mode 0644
+		dir_mode 0755
 		roll_size 1gb
 		roll_uncompressed
+		roll_compression none
 		roll_local_time
 		roll_keep 5
 		roll_keep_for 90d
 	}
 }
+log two {
+	output file /var/log/access-2.log {
+		mode 0777
+		dir_mode from_file
+		roll_size 1gib
+		roll_compression zstd
+		roll_interval 12h
+		roll_at 00:00 06:00 12:00,18:00
+		roll_minutes 10 40 45,46
+		roll_keep 10
+		roll_keep_for 90d
+	}
+}
 ----------
 {
 	"logging": {
 		"logs": {
 			"default": {
 				"exclude": [
-					"http.log.access.log0"
+					"http.log.access.one",
+					"http.log.access.two"
 				]
 			},
-			"log0": {
+			"one": {
 				"writer": {
+					"dir_mode": "0755",
 					"filename": "/var/log/access.log",
+					"mode": "0644",
 					"output": "file",
+					"roll_compression": "none",
 					"roll_gzip": false,
 					"roll_keep": 5,
 					"roll_keep_days": 90,
@@ -29,7 +49,35 @@ log {
 					"roll_size_mb": 954
 				},
 				"include": [
-					"http.log.access.log0"
+					"http.log.access.one"
+				]
+			},
+			"two": {
+				"writer": {
+					"dir_mode": "from_file",
+					"filename": "/var/log/access-2.log",
+					"mode": "0777",
+					"output": "file",
+					"roll_at": [
+						"00:00",
+						"06:00",
+						"12:00",
+						"18:00"
+					],
+					"roll_compression": "zstd",
+					"roll_interval": 43200000000000,
+					"roll_keep": 10,
+					"roll_keep_days": 90,
+					"roll_minutes": [
+						10,
+						40,
+						45,
+						46
+					],
+					"roll_size_mb": 1024
+				},
+				"include": [
+					"http.log.access.two"
 				]
 			}
 		}
@@ -42,7 +90,7 @@ log {
 						":80"
 					],
 					"logs": {
-						"default_logger_name": "log0"
+						"default_logger_name": "two"
 					}
 				}
 			}

caddytest/integration/caddyfile_adapt/renewal_window_ratio_global.caddyfiletest

@@ -0,0 +1,41 @@
+{
+	renewal_window_ratio 0.1666
+}
+
+example.com {
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":443"
+					],
+					"routes": [
+						{
+							"match": [
+								{
+									"host": [
+										"example.com"
+									]
+								}
+							],
+							"terminal": true
+						}
+					]
+				}
+			}
+		},
+		"tls": {
+			"automation": {
+				"policies": [
+					{
+						"renewal_window_ratio": 0.1666
+					}
+				]
+			}
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/renewal_window_ratio_tls_directive.caddyfiletest

@@ -0,0 +1,63 @@
+{
+	renewal_window_ratio 0.1666
+}
+
+a.example.com {
+	tls {
+		renewal_window_ratio 0.25
+	}
+}
+
+b.example.com {
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":443"
+					],
+					"routes": [
+						{
+							"match": [
+								{
+									"host": [
+										"a.example.com"
+									]
+								}
+							],
+							"terminal": true
+						},
+						{
+							"match": [
+								{
+									"host": [
+										"b.example.com"
+									]
+								}
+							],
+							"terminal": true
+						}
+					]
+				}
+			}
+		},
+		"tls": {
+			"automation": {
+				"policies": [
+					{
+						"subjects": [
+							"a.example.com"
+						],
+						"renewal_window_ratio": 0.25
+					},
+					{
+						"renewal_window_ratio": 0.1666
+					}
+				]
+			}
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/tls_acme_dns_override_global_dns.caddyfiletest

@@ -0,0 +1,83 @@
+{
+	dns mock foo
+	acme_dns mock bar
+}
+
+localhost {
+	tls {
+		resolvers 8.8.8.8 8.8.4.4
+	}
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":443"
+					],
+					"routes": [
+						{
+							"match": [
+								{
+									"host": [
+										"localhost"
+									]
+								}
+							],
+							"terminal": true
+						}
+					]
+				}
+			}
+		},
+		"tls": {
+			"automation": {
+				"policies": [
+					{
+						"subjects": [
+							"localhost"
+						],
+						"issuers": [
+							{
+								"challenges": {
+									"dns": {
+										"provider": {
+											"argument": "bar",
+											"name": "mock"
+										},
+										"resolvers": [
+											"8.8.8.8",
+											"8.8.4.4"
+										]
+									}
+								},
+								"module": "acme"
+							}
+						]
+					},
+					{
+						"issuers": [
+							{
+								"challenges": {
+									"dns": {
+										"provider": {
+											"argument": "bar",
+											"name": "mock"
+										}
+									}
+								},
+								"module": "acme"
+							}
+						]
+					}
+				]
+			},
+			"dns": {
+				"argument": "foo",
+				"name": "mock"
+			}
+		}
+	}
+}

caddytest/integration/forwardauth_test.go

@@ -0,0 +1,206 @@
+// Copyright 2015 Matthew Holt and The Caddy Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package integration
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"sync"
+	"testing"
+
+	"github.com/caddyserver/caddy/v2/caddytest"
+)
+
+// TestForwardAuthCopyHeadersStripsClientHeaders is a regression test for the
+// header injection vulnerability in forward_auth copy_headers.
+//
+// When the auth service returns 200 OK without one of the copy_headers headers,
+// the MatchNot guard skips the Set operation. Before this fix, the original
+// client-supplied header survived unchanged into the backend request, allowing
+// privilege escalation with only a valid (non-privileged) bearer token. After
+// the fix, an unconditional delete route runs first, so the backend always
+// sees an absent header rather than the attacker-supplied value.
+func TestForwardAuthCopyHeadersStripsClientHeaders(t *testing.T) {
+	// Mock auth service: accepts any Bearer token, returns 200 OK with NO
+	// identity headers. This is the stateless JWT validator pattern that
+	// triggers the vulnerability.
+	authSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if strings.HasPrefix(r.Header.Get("Authorization"), "Bearer ") {
+			w.WriteHeader(http.StatusOK)
+			return
+		}
+		w.WriteHeader(http.StatusUnauthorized)
+	}))
+	defer authSrv.Close()
+
+	// Mock backend: records the identity headers it receives. A real application
+	// would use X-User-Id / X-User-Role to make authorization decisions.
+	type received struct{ userID, userRole string }
+	var (
+		mu   sync.Mutex
+		last received
+	)
+	backendSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		mu.Lock()
+		last = received{
+			userID:   r.Header.Get("X-User-Id"),
+			userRole: r.Header.Get("X-User-Role"),
+		}
+		mu.Unlock()
+		w.WriteHeader(http.StatusOK)
+		fmt.Fprint(w, "ok")
+	}))
+	defer backendSrv.Close()
+
+	authAddr := strings.TrimPrefix(authSrv.URL, "http://")
+	backendAddr := strings.TrimPrefix(backendSrv.URL, "http://")
+
+	tester := caddytest.NewTester(t)
+	tester.InitServer(fmt.Sprintf(`
+	{
+		skip_install_trust
+		admin localhost:2999
+		http_port 9080
+		https_port 9443
+		grace_period 1ns
+	}
+	http://localhost:9080 {
+		forward_auth %s {
+			uri /
+			copy_headers X-User-Id X-User-Role
+		}
+		reverse_proxy %s
+	}
+	`, authAddr, backendAddr), "caddyfile")
+
+	// Case 1: no token. Auth must still reject the request even when the client
+	// includes identity headers. This confirms the auth check is not bypassed.
+	req, _ := http.NewRequest(http.MethodGet, "http://localhost:9080/", nil)
+	req.Header.Set("X-User-Id", "injected")
+	req.Header.Set("X-User-Role", "injected")
+	resp := tester.AssertResponseCode(req, http.StatusUnauthorized)
+	resp.Body.Close()
+
+	// Case 2: valid token, no injected headers. The backend should see absent
+	// identity headers (the auth service never returns them).
+	req, _ = http.NewRequest(http.MethodGet, "http://localhost:9080/", nil)
+	req.Header.Set("Authorization", "Bearer token123")
+	tester.AssertResponse(req, http.StatusOK, "ok")
+	mu.Lock()
+	gotID, gotRole := last.userID, last.userRole
+	mu.Unlock()
+	if gotID != "" {
+		t.Errorf("baseline: X-User-Id should be absent, got %q", gotID)
+	}
+	if gotRole != "" {
+		t.Errorf("baseline: X-User-Role should be absent, got %q", gotRole)
+	}
+
+	// Case 3 (the security regression): valid token plus forged identity headers.
+	// The fix must strip those values so the backend never sees them.
+	req, _ = http.NewRequest(http.MethodGet, "http://localhost:9080/", nil)
+	req.Header.Set("Authorization", "Bearer token123")
+	req.Header.Set("X-User-Id", "admin")        // forged
+	req.Header.Set("X-User-Role", "superadmin") // forged
+	tester.AssertResponse(req, http.StatusOK, "ok")
+	mu.Lock()
+	gotID, gotRole = last.userID, last.userRole
+	mu.Unlock()
+	if gotID != "" {
+		t.Errorf("injection: X-User-Id must be stripped, got %q", gotID)
+	}
+	if gotRole != "" {
+		t.Errorf("injection: X-User-Role must be stripped, got %q", gotRole)
+	}
+}
+
+// TestForwardAuthCopyHeadersAuthResponseWins verifies that when the auth
+// service does include a copy_headers header in its response, that value
+// is forwarded to the backend and takes precedence over any client-supplied
+// value for the same header.
+func TestForwardAuthCopyHeadersAuthResponseWins(t *testing.T) {
+	const wantUserID = "service-user-42"
+	const wantUserRole = "editor"
+
+	// Auth service: accepts bearer token and sets identity headers.
+	authSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if strings.HasPrefix(r.Header.Get("Authorization"), "Bearer ") {
+			w.Header().Set("X-User-Id", wantUserID)
+			w.Header().Set("X-User-Role", wantUserRole)
+			w.WriteHeader(http.StatusOK)
+			return
+		}
+		w.WriteHeader(http.StatusUnauthorized)
+	}))
+	defer authSrv.Close()
+
+	type received struct{ userID, userRole string }
+	var (
+		mu   sync.Mutex
+		last received
+	)
+	backendSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		mu.Lock()
+		last = received{
+			userID:   r.Header.Get("X-User-Id"),
+			userRole: r.Header.Get("X-User-Role"),
+		}
+		mu.Unlock()
+		w.WriteHeader(http.StatusOK)
+		fmt.Fprint(w, "ok")
+	}))
+	defer backendSrv.Close()
+
+	authAddr := strings.TrimPrefix(authSrv.URL, "http://")
+	backendAddr := strings.TrimPrefix(backendSrv.URL, "http://")
+
+	tester := caddytest.NewTester(t)
+	tester.InitServer(fmt.Sprintf(`
+	{
+		skip_install_trust
+		admin localhost:2999
+		http_port 9080
+		https_port 9443
+		grace_period 1ns
+	}
+	http://localhost:9080 {
+		forward_auth %s {
+			uri /
+			copy_headers X-User-Id X-User-Role
+		}
+		reverse_proxy %s
+	}
+	`, authAddr, backendAddr), "caddyfile")
+
+	// The client sends forged headers; the auth service overrides them with
+	// its own values. The backend must receive the auth service values.
+	req, _ := http.NewRequest(http.MethodGet, "http://localhost:9080/", nil)
+	req.Header.Set("Authorization", "Bearer token123")
+	req.Header.Set("X-User-Id", "forged-id")   // must be overwritten
+	req.Header.Set("X-User-Role", "forged-role") // must be overwritten
+	tester.AssertResponse(req, http.StatusOK, "ok")
+
+	mu.Lock()
+	gotID, gotRole := last.userID, last.userRole
+	mu.Unlock()
+	if gotID != wantUserID {
+		t.Errorf("X-User-Id: want %q, got %q", wantUserID, gotID)
+	}
+	if gotRole != wantUserRole {
+		t.Errorf("X-User-Role: want %q, got %q", wantUserRole, gotRole)
+	}
+}

caddytest/integration/listener_test.go

@@ -3,7 +3,7 @@ package integration
 import (
 	"bytes"
 	"fmt"
-	"math/rand"
+	"math/rand/v2"
 	"net"
 	"net/http"
 	"strings"
@@ -54,7 +54,7 @@ func TestHTTPRedirectWrapperWithLargeUpload(t *testing.T) {
 	const uploadSize = (1024 * 1024) + 1 // 1 MB + 1 byte
 	// 1 more than an MB
 	body := make([]byte, uploadSize)
-	rand.New(rand.NewSource(0)).Read(body)
+	rand.NewChaCha8([32]byte{}).Read(body)
 
 	tester := setupListenerWrapperTest(t, func(writer http.ResponseWriter, request *http.Request) {
 		buf := new(bytes.Buffer)

caddytest/integration/pki_test.go

@@ -53,7 +53,7 @@ func TestLeafCertLifetimeLessThanIntermediate(t *testing.T) {
         }
       }
     }
-	`, "json", "certificate lifetime (168h0m0s) should be less than intermediate certificate lifetime (168h0m0s)")
+  `, "json", "should be less than intermediate certificate lifetime")
 }
 
 func TestIntermediateLifetimeLessThanRoot(t *testing.T) {
@@ -103,5 +103,5 @@ func TestIntermediateLifetimeLessThanRoot(t *testing.T) {
         }
       }
     }
-	`, "json", "intermediate certificate lifetime must be less than root certificate lifetime (86400h0m0s)")
+  `, "json", "intermediate certificate lifetime must be less than actual root certificate lifetime")
 }

caddytest/integration/proxyprotocol_test.go

@@ -0,0 +1,595 @@
+// Copyright 2015 Matthew Holt and The Caddy Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Integration tests for Caddy's PROXY protocol support, covering two distinct
+// roles that Caddy can play:
+//
+//  1. As a PROXY protocol *sender* (reverse proxy outbound transport):
+//     Caddy receives an inbound request from a test client and the
+//     reverse_proxy handler forwards it to an upstream with a PROXY protocol
+//     header (v1 or v2) prepended to the connection.  A lightweight backend
+//     built with go-proxyproto validates that the header was received and
+//     carries the correct client address.
+//
+//     Transport versions tested:
+//   - "1.1"  -> plain HTTP/1.1 to the upstream
+//   - "h2c"  -> HTTP/2 cleartext (h2c) to the upstream (regression for #7529)
+//   - "2"    -> HTTP/2 over TLS (h2) to the upstream
+//
+//     For each transport version both PROXY protocol v1 and v2 are exercised.
+//
+//     HTTP/3 (h3) is not included because it uses QUIC/UDP and therefore
+//     bypasses the TCP-level dialContext that injects PROXY protocol headers;
+//     there is no meaningful h3 + proxy protocol sender combination to test.
+//
+//  2. As a PROXY protocol *receiver* (server-side listener wrapper):
+//     A raw TCP client dials Caddy directly, injects a PROXY v2 header
+//     spoofing a source address, and sends a normal HTTP/1.1 request.  The
+//     Caddy server is configured with the proxy_protocol listener wrapper and
+//     is expected to surface the spoofed address via the
+//     {http.request.remote.host} placeholder.
+
+package integration
+
+import (
+	"crypto/tls"
+	"encoding/json"
+	"fmt"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"slices"
+	"strings"
+	"sync"
+	"testing"
+
+	goproxy "github.com/pires/go-proxyproto"
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/h2c"
+
+	"github.com/caddyserver/caddy/v2/caddytest"
+)
+
+// proxyProtoBackend is a minimal HTTP server that sits behind a
+// go-proxyproto listener and records the source address that was
+// delivered in the PROXY header for each request.
+type proxyProtoBackend struct {
+	mu          sync.Mutex
+	headerAddrs []string // host:port strings extracted from each PROXY header
+
+	ln  net.Listener
+	srv *http.Server
+}
+
+// newProxyProtoBackend starts a TCP listener wrapped with go-proxyproto on a
+// random local port and serves requests with a simple "OK" body.  The PROXY
+// header source addresses are accumulated in headerAddrs so tests can
+// inspect them.
+func newProxyProtoBackend(t *testing.T) *proxyProtoBackend {
+	t.Helper()
+
+	b := &proxyProtoBackend{}
+
+	rawLn, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("backend: listen: %v", err)
+	}
+
+	// Wrap with go-proxyproto so the PROXY header is stripped and parsed
+	// before the HTTP server sees the connection.  We use REQUIRE so that a
+	// missing header returns an error instead of silently passing through.
+	pLn := &goproxy.Listener{
+		Listener: rawLn,
+		Policy: func(_ net.Addr) (goproxy.Policy, error) {
+			return goproxy.REQUIRE, nil
+		},
+	}
+	b.ln = pLn
+
+	// Wrap the handler with h2c support so the backend can speak HTTP/2
+	// cleartext (h2c) as well as plain HTTP/1.1.  Without this, Caddy's
+	// reverse proxy would receive a 'frame too large' error when the
+	// upstream transport is configured to use h2c.
+	h2Server := &http2.Server{}
+	handlerFn := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// go-proxyproto has already updated the net.Conn's remote
+		// address to the value from the PROXY header; the HTTP server
+		// surfaces it in r.RemoteAddr.
+		b.mu.Lock()
+		b.headerAddrs = append(b.headerAddrs, r.RemoteAddr)
+		b.mu.Unlock()
+		w.WriteHeader(http.StatusOK)
+		_, _ = fmt.Fprint(w, "OK")
+	})
+
+	b.srv = &http.Server{
+		Handler: h2c.NewHandler(handlerFn, h2Server),
+	}
+
+	go b.srv.Serve(pLn) //nolint:errcheck
+	t.Cleanup(func() {
+		_ = b.srv.Close()
+		_ = rawLn.Close()
+	})
+
+	return b
+}
+
+// addr returns the listening address (host:port) of the backend.
+func (b *proxyProtoBackend) addr() string {
+	return b.ln.Addr().String()
+}
+
+// recordedAddrs returns a snapshot of all PROXY-header source addresses seen
+// so far.
+func (b *proxyProtoBackend) recordedAddrs() []string {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	cp := make([]string, len(b.headerAddrs))
+	copy(cp, b.headerAddrs)
+	return cp
+}
+
+// tlsProxyProtoBackend is a TLS-enabled backend that sits behind a
+// go-proxyproto listener.  The PROXY header is stripped before the TLS
+// handshake so the layer order on a connection is:
+//
+//	raw TCP → go-proxyproto (strips PROXY header) → TLS handshake → HTTP/2
+type tlsProxyProtoBackend struct {
+	mu          sync.Mutex
+	headerAddrs []string
+
+	srv *httptest.Server
+}
+
+// newTLSProxyProtoBackend starts a TLS listener that first reads and strips
+// PROXY protocol headers (go-proxyproto, REQUIRE policy) and then performs a
+// TLS handshake.  The backend speaks HTTP/2 over TLS (h2).
+//
+// The certificate is the standard self-signed certificate generated by
+// httptest.Server; the Caddy transport must be configured with
+// insecure_skip_verify: true to trust it.
+func newTLSProxyProtoBackend(t *testing.T) *tlsProxyProtoBackend {
+	t.Helper()
+
+	b := &tlsProxyProtoBackend{}
+
+	handlerFn := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		b.mu.Lock()
+		b.headerAddrs = append(b.headerAddrs, r.RemoteAddr)
+		b.mu.Unlock()
+		w.WriteHeader(http.StatusOK)
+		_, _ = fmt.Fprint(w, "OK")
+	})
+
+	rawLn, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("tlsBackend: listen: %v", err)
+	}
+
+	// Wrap with go-proxyproto so the PROXY header is consumed before TLS.
+	pLn := &goproxy.Listener{
+		Listener: rawLn,
+		Policy: func(_ net.Addr) (goproxy.Policy, error) {
+			return goproxy.REQUIRE, nil
+		},
+	}
+
+	// httptest.NewUnstartedServer lets us replace the listener before
+	// calling StartTLS(), which wraps our proxyproto listener with
+	// tls.NewListener.  This gives us the right layer order.
+	b.srv = httptest.NewUnstartedServer(handlerFn)
+	b.srv.Listener = pLn
+
+	// StartTLS enables HTTP/2 on the server automatically.
+	b.srv.StartTLS()
+
+	t.Cleanup(func() {
+		b.srv.Close()
+	})
+
+	return b
+}
+
+// addr returns the listening address (host:port) of the TLS backend.
+func (b *tlsProxyProtoBackend) addr() string {
+	return b.srv.Listener.Addr().String()
+}
+
+// tlsConfig returns the *tls.Config used by the backend server.
+// Tests can use it to verify cert details if needed.
+func (b *tlsProxyProtoBackend) tlsConfig() *tls.Config {
+	return b.srv.TLS
+}
+
+// recordedAddrs returns a snapshot of all PROXY-header source addresses.
+func (b *tlsProxyProtoBackend) recordedAddrs() []string {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	cp := make([]string, len(b.headerAddrs))
+	copy(cp, b.headerAddrs)
+	return cp
+}
+
+// proxyProtoTLSConfig builds a Caddy JSON configuration that proxies to a TLS
+// upstream with PROXY protocol.  The transport uses insecure_skip_verify so
+// the self-signed certificate generated by httptest.Server is accepted.
+func proxyProtoTLSConfig(listenPort int, backendAddr, ppVersion string, transportVersions []string) string {
+	versionsJSON, _ := json.Marshal(transportVersions)
+	return fmt.Sprintf(`{
+		"admin": {
+			"listen": "localhost:2999"
+		},
+		"apps": {
+			"pki": {
+				"certificate_authorities": {
+					"local": {
+						"install_trust": false
+					}
+				}
+			},
+			"http": {
+				"grace_period": 1,
+				"servers": {
+					"proxy": {
+						"listen": [":%d"],
+						"automatic_https": {
+							"disable": true
+						},
+						"routes": [
+							{
+								"handle": [
+									{
+										"handler": "reverse_proxy",
+										"upstreams": [{"dial": "%s"}],
+										"transport": {
+											"protocol": "http",
+											"proxy_protocol": "%s",
+											"versions": %s,
+											"tls": {
+												"insecure_skip_verify": true
+											}
+										}
+									}
+								]
+							}
+						]
+					}
+				}
+			}
+		}
+	}`, listenPort, backendAddr, ppVersion, string(versionsJSON))
+}
+
+// testTLSProxyProtocolMatrix is the shared implementation for TLS-based proxy
+// protocol tests.  It mirrors testProxyProtocolMatrix but uses a TLS backend.
+func testTLSProxyProtocolMatrix(t *testing.T, ppVersion string, transportVersions []string, numRequests int) {
+	t.Helper()
+
+	backend := newTLSProxyProtoBackend(t)
+	listenPort := freePort(t)
+
+	tester := caddytest.NewTester(t)
+	tester.WithDefaultOverrides(caddytest.Config{
+		AdminPort: 2999,
+	})
+	cfg := proxyProtoTLSConfig(listenPort, backend.addr(), ppVersion, transportVersions)
+	tester.InitServer(cfg, "json")
+
+	proxyURL := fmt.Sprintf("http://127.0.0.1:%d/", listenPort)
+
+	for i := 0; i < numRequests; i++ {
+		resp, err := tester.Client.Get(proxyURL)
+		if err != nil {
+			t.Fatalf("request %d/%d: GET %s: %v", i+1, numRequests, proxyURL, err)
+		}
+		resp.Body.Close()
+		if resp.StatusCode != http.StatusOK {
+			t.Errorf("request %d/%d: expected status 200, got %d", i+1, numRequests, resp.StatusCode)
+		}
+	}
+
+	addrs := backend.recordedAddrs()
+	if len(addrs) == 0 {
+		t.Fatalf("backend recorded no PROXY protocol addresses (expected at least 1)")
+	}
+
+	for i, addr := range addrs {
+		host, _, err := net.SplitHostPort(addr)
+		if err != nil {
+			t.Errorf("addr[%d] %q: SplitHostPort: %v", i, addr, err)
+			continue
+		}
+		if host != "127.0.0.1" {
+			t.Errorf("addr[%d]: expected source 127.0.0.1, got %q", i, host)
+		}
+	}
+}
+
+// proxyProtoConfig builds a Caddy JSON configuration that:
+//   - listens on listenPort for inbound HTTP requests
+//   - proxies them to backendAddr with PROXY protocol ppVersion ("v1"/"v2")
+//   - uses the given transport versions (e.g. ["1.1"] or ["h2c"])
+func proxyProtoConfig(listenPort int, backendAddr, ppVersion string, transportVersions []string) string {
+	versionsJSON, _ := json.Marshal(transportVersions)
+	return fmt.Sprintf(`{
+		"admin": {
+			"listen": "localhost:2999"
+		},
+		"apps": {
+			"pki": {
+				"certificate_authorities": {
+					"local": {
+						"install_trust": false
+					}
+				}
+			},
+			"http": {
+				"grace_period": 1,
+				"servers": {
+					"proxy": {
+						"listen": [":%d"],
+						"automatic_https": {
+							"disable": true
+						},
+						"routes": [
+							{
+								"handle": [
+									{
+										"handler": "reverse_proxy",
+										"upstreams": [{"dial": "%s"}],
+										"transport": {
+											"protocol": "http",
+											"proxy_protocol": "%s",
+											"versions": %s
+										}
+									}
+								]
+							}
+						]
+					}
+				}
+			}
+		}
+	}`, listenPort, backendAddr, ppVersion, string(versionsJSON))
+}
+
+// freePort returns a free local TCP port by binding briefly and releasing it.
+func freePort(t *testing.T) int {
+	t.Helper()
+	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("freePort: %v", err)
+	}
+	port := ln.Addr().(*net.TCPAddr).Port
+	_ = ln.Close()
+	return port
+}
+
+// TestProxyProtocolV1WithH1 verifies that PROXY protocol v1 headers are sent
+// correctly when the transport uses HTTP/1.1 to the upstream.
+func TestProxyProtocolV1WithH1(t *testing.T) {
+	testProxyProtocolMatrix(t, "v1", []string{"1.1"}, 1)
+}
+
+// TestProxyProtocolV2WithH1 verifies that PROXY protocol v2 headers are sent
+// correctly when the transport uses HTTP/1.1 to the upstream.
+func TestProxyProtocolV2WithH1(t *testing.T) {
+	testProxyProtocolMatrix(t, "v2", []string{"1.1"}, 1)
+}
+
+// TestProxyProtocolV1WithH2C verifies that PROXY protocol v1 headers are sent
+// correctly when the transport uses h2c (HTTP/2 cleartext) to the upstream.
+func TestProxyProtocolV1WithH2C(t *testing.T) {
+	testProxyProtocolMatrix(t, "v1", []string{"h2c"}, 1)
+}
+
+// TestProxyProtocolV2WithH2C verifies that PROXY protocol v2 headers are sent
+// correctly when the transport uses h2c (HTTP/2 cleartext) to the upstream.
+// This is the primary regression test for github.com/caddyserver/caddy/issues/7529:
+// before the fix, the h2 transport opened a new TCP connection per request
+// (because req.URL.Host was mangled differently for each request due to the
+// varying client port), which caused file-descriptor exhaustion under load.
+func TestProxyProtocolV2WithH2C(t *testing.T) {
+	testProxyProtocolMatrix(t, "v2", []string{"h2c"}, 1)
+}
+
+// TestProxyProtocolV2WithH2CMultipleRequests sends several sequential requests
+// through the h2c + PROXY-protocol path and confirms that:
+//  1. Every request receives a 200 response (no connection exhaustion).
+//  2. The backend received at least one PROXY header (connection was reused).
+//
+// This is the core regression guard for issue #7529: without the fix, a new
+// TCP connection was opened per request, quickly exhausting file descriptors.
+func TestProxyProtocolV2WithH2CMultipleRequests(t *testing.T) {
+	testProxyProtocolMatrix(t, "v2", []string{"h2c"}, 5)
+}
+
+// TestProxyProtocolV1WithH2 verifies that PROXY protocol v1 headers are sent
+// correctly when the transport uses HTTP/2 over TLS (h2) to the upstream.
+func TestProxyProtocolV1WithH2(t *testing.T) {
+	testTLSProxyProtocolMatrix(t, "v1", []string{"2"}, 1)
+}
+
+// TestProxyProtocolV2WithH2 verifies that PROXY protocol v2 headers are sent
+// correctly when the transport uses HTTP/2 over TLS (h2) to the upstream.
+func TestProxyProtocolV2WithH2(t *testing.T) {
+	testTLSProxyProtocolMatrix(t, "v2", []string{"2"}, 1)
+}
+
+// TestProxyProtocolServerAndProxy is an end-to-end matrix test that exercises
+// all combinations of PROXY protocol version x transport version.
+func TestProxyProtocolServerAndProxy(t *testing.T) {
+	plainTests := []struct {
+		name              string
+		ppVersion         string
+		transportVersions []string
+		numRequests       int
+	}{
+		{"h1-v1", "v1", []string{"1.1"}, 3},
+		{"h1-v2", "v2", []string{"1.1"}, 3},
+		{"h2c-v1", "v1", []string{"h2c"}, 3},
+		{"h2c-v2", "v2", []string{"h2c"}, 3},
+	}
+	for _, tc := range plainTests {
+		t.Run(tc.name, func(t *testing.T) {
+			testProxyProtocolMatrix(t, tc.ppVersion, tc.transportVersions, tc.numRequests)
+		})
+	}
+
+	tlsTests := []struct {
+		name              string
+		ppVersion         string
+		transportVersions []string
+		numRequests       int
+	}{
+		{"h2-v1", "v1", []string{"2"}, 3},
+		{"h2-v2", "v2", []string{"2"}, 3},
+	}
+	for _, tc := range tlsTests {
+		t.Run(tc.name, func(t *testing.T) {
+			testTLSProxyProtocolMatrix(t, tc.ppVersion, tc.transportVersions, tc.numRequests)
+		})
+	}
+}
+
+// testProxyProtocolMatrix is the shared implementation for the proxy protocol
+// tests.  It:
+//  1. Starts a go-proxyproto-wrapped backend.
+//  2. Configures Caddy as a reverse proxy with the given PROXY protocol
+//     version and transport versions.
+//  3. Sends numRequests GET requests through Caddy and asserts 200 OK each time.
+//  4. Asserts the backend recorded at least one PROXY header whose source host
+//     is 127.0.0.1 (the loopback address used by the test client).
+func testProxyProtocolMatrix(t *testing.T, ppVersion string, transportVersions []string, numRequests int) {
+	t.Helper()
+
+	backend := newProxyProtoBackend(t)
+	listenPort := freePort(t)
+
+	tester := caddytest.NewTester(t)
+	tester.WithDefaultOverrides(caddytest.Config{
+		AdminPort: 2999,
+	})
+	cfg := proxyProtoConfig(listenPort, backend.addr(), ppVersion, transportVersions)
+	tester.InitServer(cfg, "json")
+
+	// If the test is h2c-only (no "1.1" in versions), reconfigure the test
+	// client transport to use unencrypted HTTP/2 so we actually exercise the
+	// h2c code path through Caddy.
+	if slices.Contains(transportVersions, "h2c") && !slices.Contains(transportVersions, "1.1") {
+		tr, ok := tester.Client.Transport.(*http.Transport)
+		if ok {
+			tr.Protocols = new(http.Protocols)
+			tr.Protocols.SetHTTP1(false)
+			tr.Protocols.SetUnencryptedHTTP2(true)
+		}
+	}
+
+	proxyURL := fmt.Sprintf("http://127.0.0.1:%d/", listenPort)
+
+	for i := 0; i < numRequests; i++ {
+		resp, err := tester.Client.Get(proxyURL)
+		if err != nil {
+			t.Fatalf("request %d/%d: GET %s: %v", i+1, numRequests, proxyURL, err)
+		}
+		resp.Body.Close()
+		if resp.StatusCode != http.StatusOK {
+			t.Errorf("request %d/%d: expected status 200, got %d", i+1, numRequests, resp.StatusCode)
+		}
+	}
+
+	// The backend must have seen at least one PROXY header.  For h1, there is
+	// one per request; for h2c, requests share the same connection so only one
+	// header is written at connection establishment.
+	addrs := backend.recordedAddrs()
+	if len(addrs) == 0 {
+		t.Fatalf("backend recorded no PROXY protocol addresses (expected at least 1)")
+	}
+
+	// Every PROXY-decoded source address must be the loopback address since
+	// the test client always connects from 127.0.0.1.
+	for i, addr := range addrs {
+		host, _, err := net.SplitHostPort(addr)
+		if err != nil {
+			t.Errorf("addr[%d] %q: SplitHostPort: %v", i, addr, err)
+			continue
+		}
+		if host != "127.0.0.1" {
+			t.Errorf("addr[%d]: expected source 127.0.0.1, got %q", i, host)
+		}
+	}
+}
+
+// TestProxyProtocolListenerWrapper verifies that Caddy's
+// caddy.listeners.proxy_protocol listener wrapper can successfully parse
+// incoming PROXY protocol headers.
+//
+// The test dials Caddy's listening port directly, injects a raw PROXY v2
+// header spoofing source address 10.0.0.1:1234, then sends a normal
+// HTTP/1.1 GET request.  The Caddy server is configured to echo back the
+// remote address ({http.request.remote.host}).  The test asserts that the
+// echoed address is the spoofed 10.0.0.1.
+func TestProxyProtocolListenerWrapper(t *testing.T) {
+	tester := caddytest.NewTester(t)
+	tester.InitServer(`{
+		skip_install_trust
+		admin localhost:2999
+		http_port 9080
+		https_port 9443
+		grace_period 1ns
+		servers :9080 {
+			listener_wrappers {
+				proxy_protocol {
+					timeout 5s
+					allow 127.0.0.0/8
+				}
+			}
+		}
+	}
+	http://localhost:9080 {
+		respond "{http.request.remote.host}"
+	}`, "caddyfile")
+
+	// Dial the Caddy listener directly and inject a PROXY v2 header that
+	// claims the connection originates from 10.0.0.1:1234.
+	conn, err := net.Dial("tcp", "127.0.0.1:9080")
+	if err != nil {
+		t.Fatalf("dial: %v", err)
+	}
+	defer conn.Close()
+
+	spoofedSrc := &net.TCPAddr{IP: net.ParseIP("10.0.0.1"), Port: 1234}
+	spoofedDst := &net.TCPAddr{IP: net.ParseIP("127.0.0.1"), Port: 9080}
+	hdr := goproxy.HeaderProxyFromAddrs(2, spoofedSrc, spoofedDst)
+	if _, err := hdr.WriteTo(conn); err != nil {
+		t.Fatalf("write proxy header: %v", err)
+	}
+
+	// Write a minimal HTTP/1.1 GET request.
+	_, err = fmt.Fprintf(conn,
+		"GET / HTTP/1.1\r\nHost: localhost\r\nConnection: close\r\n\r\n")
+	if err != nil {
+		t.Fatalf("write HTTP request: %v", err)
+	}
+
+	// Read the raw response and look for the spoofed address in the body.
+	buf := make([]byte, 4096)
+	n, _ := conn.Read(buf)
+	raw := string(buf[:n])
+
+	if !strings.Contains(raw, "10.0.0.1") {
+		t.Errorf("expected spoofed address 10.0.0.1 in response body; full response:\n%s", raw)
+	}
+}

caddytest/integration/reverseproxy_test.go

@@ -8,7 +8,6 @@ import (
 	"runtime"
 	"strings"
 	"testing"
-	"time"
 
 	"github.com/caddyserver/caddy/v2/caddytest"
 )
@@ -327,6 +326,41 @@ func TestReverseProxyWithPlaceholderTCPDialAddress(t *testing.T) {
 }
 
 func TestReverseProxyHealthCheck(t *testing.T) {
+	// Start lightweight backend servers so they're ready before Caddy's
+	// active health checker runs; this avoids a startup race where the
+	// health checker probes backends that haven't yet begun accepting
+	// connections and marks them unhealthy.
+	//
+	// This mirrors how health checks are typically used in practice (to a separate
+	// backend service) and avoids probing the same Caddy instance while it's still
+	// provisioning and not ready to accept connections.
+
+	// backend server that responds to proxied requests
+	helloSrv := &http.Server{
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+			_, _ = w.Write([]byte("Hello, World!"))
+		}),
+	}
+	ln0, err := net.Listen("tcp", "127.0.0.1:2020")
+	if err != nil {
+		t.Fatalf("failed to listen on 127.0.0.1:2020: %v", err)
+	}
+	go helloSrv.Serve(ln0)
+	t.Cleanup(func() { helloSrv.Close(); ln0.Close() })
+
+	// backend server that serves health checks
+	healthSrv := &http.Server{
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+			_, _ = w.Write([]byte("ok"))
+		}),
+	}
+	ln1, err := net.Listen("tcp", "127.0.0.1:2021")
+	if err != nil {
+		t.Fatalf("failed to listen on 127.0.0.1:2021: %v", err)
+	}
+	go healthSrv.Serve(ln1)
+	t.Cleanup(func() { healthSrv.Close(); ln1.Close() })
+
 	tester := caddytest.NewTester(t)
 	tester.InitServer(`
 	{
@@ -336,12 +370,6 @@ func TestReverseProxyHealthCheck(t *testing.T) {
 		https_port    9443
 		grace_period 1ns
 	}
-	http://localhost:2020 {
-		respond "Hello, World!"
-	}
-	http://localhost:2021 {
-		respond "ok"
-	}
 	http://localhost:9080 {
 		reverse_proxy {
 			to localhost:2020
@@ -355,8 +383,68 @@ func TestReverseProxyHealthCheck(t *testing.T) {
 		}
 	}
 	`, "caddyfile")
+	tester.AssertGetResponse("http://localhost:9080/", 200, "Hello, World!")
+}
 
-	time.Sleep(100 * time.Millisecond) // TODO: for some reason this test seems particularly flaky, getting 503 when it should be 200, unless we wait
+// TestReverseProxyHealthCheckPortUsed verifies that health_port is actually
+// used for active health checks and not the upstream's main port. This is a
+// regression test for https://github.com/caddyserver/caddy/issues/7524.
+func TestReverseProxyHealthCheckPortUsed(t *testing.T) {
+	// upstream server: serves proxied requests normally, but returns 503 for
+	// /health so that if health checks mistakenly hit this port the upstream
+	// gets marked unhealthy and the proxy returns 503.
+	upstreamSrv := &http.Server{
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+			if req.URL.Path == "/health" {
+				w.WriteHeader(http.StatusServiceUnavailable)
+				return
+			}
+			_, _ = w.Write([]byte("Hello, World!"))
+		}),
+	}
+	ln0, err := net.Listen("tcp", "127.0.0.1:2022")
+	if err != nil {
+		t.Fatalf("failed to listen on 127.0.0.1:2022: %v", err)
+	}
+	go upstreamSrv.Serve(ln0)
+	t.Cleanup(func() { upstreamSrv.Close(); ln0.Close() })
+
+	// separate health check server on the configured health_port: returns 200
+	// so the upstream is marked healthy only if health checks go to this port.
+	healthSrv := &http.Server{
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+			_, _ = w.Write([]byte("ok"))
+		}),
+	}
+	ln1, err := net.Listen("tcp", "127.0.0.1:2023")
+	if err != nil {
+		t.Fatalf("failed to listen on 127.0.0.1:2023: %v", err)
+	}
+	go healthSrv.Serve(ln1)
+	t.Cleanup(func() { healthSrv.Close(); ln1.Close() })
+
+	tester := caddytest.NewTester(t)
+	tester.InitServer(`
+	{
+		skip_install_trust
+		admin localhost:2999
+		http_port     9080
+		https_port    9443
+		grace_period 1ns
+	}
+	http://localhost:9080 {
+		reverse_proxy {
+			to localhost:2022
+
+			health_uri /health
+			health_port 2023
+			health_interval 10ms
+			health_timeout 100ms
+			health_passes 1
+			health_fails 1
+		}
+	}
+	`, "caddyfile")
 	tester.AssertGetResponse("http://localhost:9080/", 200, "Hello, World!")
 }
 

caddytest/integration/testdata/issue_7518_unused_block_panic_snippets.conf

@@ -0,0 +1,15 @@
+# Used by import_block_snippet_non_replaced_block_from_separate_file.caddyfiletest
+
+(snippet) {
+	header {
+		reverse_proxy localhost:3000
+		{block}
+	}
+}
+
+# This snippet being unused by the test Caddyfile is intentional.
+# This is to test that a panic runtime error triggered by an out-of-range slice index access
+# will not happen again, please see issue #7518 and pull request #7543 for more information
+(unused_snippet) {
+    header SomeHeader SomeValue
+}

cmd/caddy/main.go

@@ -29,6 +29,8 @@
 package main
 
 import (
+	_ "time/tzdata"
+
 	caddycmd "github.com/caddyserver/caddy/v2/cmd"
 
 	// plug in Caddy modules here

cmd/cobra.go

@@ -9,9 +9,14 @@ import (
 )
 
 var defaultFactory = newRootCommandFactory(func() *cobra.Command {
-	return &cobra.Command{
-		Use: "caddy",
-		Long: `Caddy is an extensible server platform written in Go.
+	bin := caddy.CustomBinaryName
+	if bin == "" {
+		bin = "caddy"
+	}
+
+	long := caddy.CustomLongDescription
+	if long == "" {
+		long = `Caddy is an extensible server platform written in Go.
 
 At its core, Caddy merely manages configuration. Modules are plugged
 in statically at compile-time to provide useful functionality. Caddy's
@@ -91,7 +96,12 @@ package installers: https://caddyserver.com/docs/install
 
 Instructions for running Caddy in production are also available:
 https://caddyserver.com/docs/running
-`,
+`
+	}
+
+	return &cobra.Command{
+		Use:  bin,
+		Long: long,
 		Example: `  $ caddy run
   $ caddy run --config caddy.json
   $ caddy reload --config caddy.json

cmd/commandfuncs.go

@@ -74,7 +74,7 @@ func cmdStart(fl Flags) (int, error) {
 	// ensure it's the process we're expecting - we can be
 	// sure by giving it some random bytes and having it echo
 	// them back to us)
-	cmd := exec.Command(os.Args[0], "run", "--pingback", ln.Addr().String())
+	cmd := exec.Command(os.Args[0], "run", "--pingback", ln.Addr().String()) //nolint:gosec // no command injection that I can determine...
 	// we should be able to run caddy in relative paths
 	if errors.Is(cmd.Err, exec.ErrDot) {
 		cmd.Err = nil
@@ -372,7 +372,7 @@ func cmdReload(fl Flags) (int, error) {
 		return caddy.ExitCodeFailedStartup, fmt.Errorf("no config file to load")
 	}
 
-	adminAddr, err := DetermineAdminAPIAddress(addressFlag, config, configFlag, configAdapterFlag)
+	adminAddr, err := DetermineAdminAPIAddress(addressFlag, config, configFile, configAdapterFlag)
 	if err != nil {
 		return caddy.ExitCodeFailedStartup, fmt.Errorf("couldn't determine admin API address: %v", err)
 	}
@@ -411,11 +411,65 @@ func cmdBuildInfo(_ Flags) (int, error) {
 	return caddy.ExitCodeSuccess, nil
 }
 
+// jsonModuleInfo holds metadata about a Caddy module for JSON output.
+type jsonModuleInfo struct {
+	ModuleName string `json:"module_name"`
+	ModuleType string `json:"module_type"`
+	Version    string `json:"version,omitempty"`
+	PackageURL string `json:"package_url,omitempty"`
+}
+
 func cmdListModules(fl Flags) (int, error) {
 	packages := fl.Bool("packages")
 	versions := fl.Bool("versions")
 	skipStandard := fl.Bool("skip-standard")
+	jsonOutput := fl.Bool("json")
 
+	// Organize modules by whether they come with the standard distribution
+	standard, nonstandard, unknown, err := getModules()
+	if err != nil {
+		// If module info can't be fetched, just print the IDs and exit
+		for _, m := range caddy.Modules() {
+			fmt.Println(m)
+		}
+		return caddy.ExitCodeSuccess, nil
+	}
+
+	// Logic for JSON output
+	if jsonOutput {
+		output := []jsonModuleInfo{}
+
+		// addToOutput is a helper to convert internal module info to the JSON-serializable struct
+		addToOutput := func(list []moduleInfo, moduleType string) {
+			for _, mi := range list {
+				item := jsonModuleInfo{
+					ModuleName: mi.caddyModuleID,
+					ModuleType: moduleType, // Mapping the type here
+				}
+				if mi.goModule != nil {
+					item.Version = mi.goModule.Version
+					item.PackageURL = mi.goModule.Path
+				}
+				output = append(output, item)
+			}
+		}
+
+		// Pass the respective type for each category
+		if !skipStandard {
+			addToOutput(standard, "standard")
+		}
+		addToOutput(nonstandard, "non-standard")
+		addToOutput(unknown, "unknown")
+
+		jsonBytes, err := json.MarshalIndent(output, "", "  ")
+		if err != nil {
+			return caddy.ExitCodeFailedQuit, err
+		}
+		fmt.Println(string(jsonBytes))
+		return caddy.ExitCodeSuccess, nil
+	}
+
+	// Logic for Text output (Fallback)
 	printModuleInfo := func(mi moduleInfo) {
 		fmt.Print(mi.caddyModuleID)
 		if versions && mi.goModule != nil {
@@ -433,16 +487,6 @@ func cmdListModules(fl Flags) (int, error) {
 		fmt.Println()
 	}
 
-	// organize modules by whether they come with the standard distribution
-	standard, nonstandard, unknown, err := getModules()
-	if err != nil {
-		// oh well, just print the module IDs and exit
-		for _, m := range caddy.Modules() {
-			fmt.Println(m)
-		}
-		return caddy.ExitCodeSuccess, nil
-	}
-
 	// Standard modules (always shipped with Caddy)
 	if !skipStandard {
 		if len(standard) > 0 {
@@ -461,8 +505,8 @@ func cmdListModules(fl Flags) (int, error) {
 		for _, mod := range nonstandard {
 			printModuleInfo(mod)
 		}
+		fmt.Printf("\n  Non-standard modules: %d\n", len(nonstandard))
 	}
-	fmt.Printf("\n  Non-standard modules: %d\n", len(nonstandard))
 
 	// Unknown modules (couldn't get Caddy module info)
 	if len(unknown) > 0 {
@@ -472,8 +516,8 @@ func cmdListModules(fl Flags) (int, error) {
 		for _, mod := range unknown {
 			printModuleInfo(mod)
 		}
+		fmt.Printf("\n  Unknown modules: %d\n", len(unknown))
 	}
-	fmt.Printf("\n  Unknown modules: %d\n", len(unknown))
 
 	return caddy.ExitCodeSuccess, nil
 }
@@ -653,7 +697,7 @@ func cmdFmt(fl Flags) (int, error) {
 	output := caddyfile.Format(input)
 
 	if fl.Bool("overwrite") {
-		if err := os.WriteFile(configFile, output, 0o600); err != nil {
+		if err := os.WriteFile(configFile, output, 0o600); err != nil { //nolint:gosec // path traversal is not really a thing here, this is either "Caddyfile" or admin-controlled
 			return caddy.ExitCodeFailedStartup, fmt.Errorf("overwriting formatted file: %v", err)
 		}
 		return caddy.ExitCodeSuccess, nil
@@ -776,7 +820,7 @@ func AdminAPIRequest(adminAddr, method, uri string, headers http.Header, body io
 		},
 	}
 
-	resp, err := client.Do(req)
+	resp, err := client.Do(req) //nolint:gosec // the only SSRF here would be self-sabatoge I think
 	if err != nil {
 		return nil, fmt.Errorf("performing request: %v", err)
 	}

cmd/commands.go

@@ -229,12 +229,13 @@ documentation: https://go.dev/doc/modules/version-numbers
 
 	RegisterCommand(Command{
 		Name:  "list-modules",
-		Usage: "[--packages] [--versions] [--skip-standard]",
+		Usage: "[--packages] [--versions] [--skip-standard] [--json]",
 		Short: "Lists the installed Caddy modules",
 		CobraFunc: func(cmd *cobra.Command) {
 			cmd.Flags().BoolP("packages", "", false, "Print package paths")
 			cmd.Flags().BoolP("versions", "", false, "Print version information")
 			cmd.Flags().BoolP("skip-standard", "s", false, "Skip printing standard modules")
+			cmd.Flags().BoolP("json", "", false, "Print modules in JSON format")
 			cmd.RunE = WrapCommandFuncForCobra(cmdListModules)
 		},
 	})

cmd/main.go

@@ -231,7 +231,10 @@ func loadConfigWithLogger(logger *zap.Logger, configFile, adapterName string) ([
 		// validate that the config is at least valid JSON
 		err = json.Unmarshal(config, new(any))
 		if err != nil {
-			return nil, "", "", fmt.Errorf("config is not valid JSON: %v; did you mean to use a config adapter (the --adapter flag)?", err)
+			if jsonErr, ok := err.(*json.SyntaxError); ok {
+				return nil, "", "", fmt.Errorf("config is not valid JSON: %w, at offset %d; did you mean to use a config adapter (the --adapter flag)?", err, jsonErr.Offset)
+			}
+			return nil, "", "", fmt.Errorf("config is not valid JSON: %w; did you mean to use a config adapter (the --adapter flag)?", err)
 		}
 	}
 
@@ -481,7 +484,13 @@ func setResourceLimits(logger *zap.Logger) func() {
 	// See https://pkg.go.dev/runtime/debug#SetMemoryLimit
 	_, _ = memlimit.SetGoMemLimitWithOpts(
 		memlimit.WithLogger(
-			slog.New(zapslog.NewHandler(logger.Core())),
+			slog.New(zapslog.NewHandler(
+				logger.Core(),
+				zapslog.WithName("memlimit"),
+				// the default enables traces at ERROR level, this disables
+				// them by setting it to a level higher than any other level
+				zapslog.AddStacktraceAt(slog.Level(127)),
+			)),
 		),
 		memlimit.WithProvider(
 			memlimit.ApplyFallback(

config_test.go

@@ -345,7 +345,8 @@ func TestProvisionContext_NilConfig(t *testing.T) {
 	}
 
 	// Clean up
-	ctx.cfg.cancelFunc()
+	// TODO: Investigate
+	ctx.cfg.cancelFunc(nil)
 }
 
 func TestDuration_UnmarshalJSON_EdgeCases(t *testing.T) {

context.go

@@ -21,12 +21,14 @@ import (
 	"log"
 	"log/slog"
 	"reflect"
+	"sync"
 
 	"github.com/caddyserver/certmagic"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/collectors"
 	"go.uber.org/zap"
 	"go.uber.org/zap/exp/zapslog"
+	"go.uber.org/zap/zapcore"
 
 	"github.com/caddyserver/caddy/v2/internal/filesystems"
 )
@@ -61,10 +63,17 @@ type Context struct {
 // modules which are loaded will be properly unloaded.
 // See standard library context package's documentation.
 func NewContext(ctx Context) (Context, context.CancelFunc) {
+	newCtx, cancelCause := NewContextWithCause(ctx)
+	return newCtx, func() { cancelCause(nil) }
+}
+
+// NewContextWithCause is like NewContext but returns a context.CancelCauseFunc.
+// EXPERIMENTAL: This API is subject to change.
+func NewContextWithCause(ctx Context) (Context, context.CancelCauseFunc) {
 	newCtx := Context{moduleInstances: make(map[string][]Module), cfg: ctx.cfg, metricsRegistry: prometheus.NewPedanticRegistry()}
-	c, cancel := context.WithCancel(ctx.Context)
-	wrappedCancel := func() {
-		cancel()
+	c, cancel := context.WithCancelCause(ctx.Context)
+	wrappedCancel := func(cause error) {
+		cancel(cause)
 
 		for _, f := range ctx.cleanupFuncs {
 			f()
@@ -583,24 +592,62 @@ func (ctx Context) Logger(module ...Module) *zap.Logger {
 	return ctx.cfg.Logging.Logger(mod)
 }
 
+type slogHandlerFactory func(handler slog.Handler, core zapcore.Core, moduleID string) slog.Handler
+
+var (
+	slogHandlerFactories   []slogHandlerFactory
+	slogHandlerFactoriesMu sync.RWMutex
+)
+
+// RegisterSlogHandlerFactory allows modules to register custom log/slog.Handler,
+// for instance, to add contextual data to the logs.
+func RegisterSlogHandlerFactory(factory slogHandlerFactory) {
+	slogHandlerFactoriesMu.Lock()
+	slogHandlerFactories = append(slogHandlerFactories, factory)
+	slogHandlerFactoriesMu.Unlock()
+}
+
 // Slogger returns a slog logger that is intended for use by
 // the most recent module associated with the context.
 func (ctx Context) Slogger() *slog.Logger {
+	var (
+		handler  slog.Handler
+		core     zapcore.Core
+		moduleID string
+	)
+
+	// the default enables traces at ERROR level, this disables
+	// them by setting it to a level higher than any other level
+	tracesOpt := zapslog.AddStacktraceAt(slog.Level(127))
+
 	if ctx.cfg == nil {
 		// often the case in tests; just use a dev logger
 		l, err := zap.NewDevelopment()
 		if err != nil {
 			panic("config missing, unable to create dev logger: " + err.Error())
 		}
-		return slog.New(zapslog.NewHandler(l.Core()))
+
+		core = l.Core()
+		handler = zapslog.NewHandler(core, tracesOpt)
+	} else {
+		mod := ctx.Module()
+		if mod == nil {
+			core = Log().Core()
+			handler = zapslog.NewHandler(core, tracesOpt)
+		} else {
+			moduleID = string(mod.CaddyModule().ID)
+			core = ctx.cfg.Logging.Logger(mod).Core()
+			handler = zapslog.NewHandler(core, zapslog.WithName(moduleID), tracesOpt)
+		}
 	}
-	mod := ctx.Module()
-	if mod == nil {
-		return slog.New(zapslog.NewHandler(Log().Core()))
+
+	slogHandlerFactoriesMu.RLock()
+	for _, f := range slogHandlerFactories {
+		handler = f(handler, core, moduleID)
 	}
-	return slog.New(zapslog.NewHandler(ctx.cfg.Logging.Logger(mod).Core(),
-		zapslog.WithName(string(mod.CaddyModule().ID)),
-	))
+	slogHandlerFactoriesMu.RUnlock()
+
+	return slog.New(handler)
 }
 
 // Modules returns the lineage of modules that this context provisioned,

go.mod

@@ -1,108 +1,125 @@
 module github.com/caddyserver/caddy/v2
 
-go 1.25
+go 1.25.0
 
 require (
-	github.com/BurntSushi/toml v1.5.0
-	github.com/DeRuina/timberjack v1.3.8
-	github.com/KimMachineGun/automemlimit v0.7.4
+	github.com/BurntSushi/toml v1.6.0
+	github.com/DeRuina/timberjack v1.3.9
+	github.com/KimMachineGun/automemlimit v0.7.5
 	github.com/Masterminds/sprig/v3 v3.3.0
-	github.com/alecthomas/chroma/v2 v2.20.0
+	github.com/alecthomas/chroma/v2 v2.23.1
 	github.com/aryann/difflib v0.0.0-20210328193216-ff5ff6dc229b
-	github.com/caddyserver/certmagic v0.25.0
-	github.com/caddyserver/zerossl v0.1.3
-	github.com/cloudflare/circl v1.6.1
+	github.com/caddyserver/certmagic v0.25.2
+	github.com/caddyserver/zerossl v0.1.5
+	github.com/cloudflare/circl v1.6.3
 	github.com/dustin/go-humanize v1.0.1
-	github.com/go-chi/chi/v5 v5.2.3
-	github.com/google/cel-go v0.26.1
+	github.com/go-chi/chi/v5 v5.2.5
+	github.com/google/cel-go v0.27.0
 	github.com/google/uuid v1.6.0
-	github.com/klauspost/compress v1.18.0
+	github.com/klauspost/compress v1.18.4
 	github.com/klauspost/cpuid/v2 v2.3.0
-	github.com/mholt/acmez/v3 v3.1.4
+	github.com/mholt/acmez/v3 v3.1.6
 	github.com/prometheus/client_golang v1.23.2
-	github.com/quic-go/quic-go v0.55.0
-	github.com/smallstep/certificates v0.28.4
+	github.com/quic-go/quic-go v0.59.0
+	github.com/smallstep/certificates v0.30.0-rc3
 	github.com/smallstep/nosql v0.7.0
 	github.com/smallstep/truststore v0.13.0
-	github.com/spf13/cobra v1.10.1
-	github.com/spf13/pflag v1.0.9
+	github.com/spf13/cobra v1.10.2
+	github.com/spf13/pflag v1.0.10
 	github.com/stretchr/testify v1.11.1
-	github.com/tailscale/tscert v0.0.0-20240608151842-d3f834017e53
-	github.com/yuin/goldmark v1.7.13
+	github.com/tailscale/tscert v0.0.0-20251216020129-aea342f6d747
+	github.com/yuin/goldmark v1.7.16
 	github.com/yuin/goldmark-highlighting/v2 v2.0.0-20230729083705-37449abec8cc
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.63.0
-	go.opentelemetry.io/contrib/propagators/autoprop v0.63.0
-	go.opentelemetry.io/otel v1.38.0
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.38.0
-	go.opentelemetry.io/otel/sdk v1.38.0
+	go.opentelemetry.io/contrib/exporters/autoexport v0.65.0
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.65.0
+	go.opentelemetry.io/contrib/propagators/autoprop v0.65.0
+	go.opentelemetry.io/otel v1.40.0
+	go.opentelemetry.io/otel/sdk v1.40.0
+	go.step.sm/crypto v0.76.2
 	go.uber.org/automaxprocs v1.6.0
-	go.uber.org/zap v1.27.0
+	go.uber.org/zap v1.27.1
 	go.uber.org/zap/exp v0.3.0
-	golang.org/x/crypto v0.43.0
-	golang.org/x/crypto/x509roots/fallback v0.0.0-20250927194341-2beaa59a3c99
-	golang.org/x/net v0.46.0
-	golang.org/x/sync v0.17.0
-	golang.org/x/term v0.36.0
+	golang.org/x/crypto v0.48.0
+	golang.org/x/crypto/x509roots/fallback v0.0.0-20260213171211-a408498e5541
+	golang.org/x/net v0.51.0
+	golang.org/x/sync v0.19.0
+	golang.org/x/term v0.40.0
 	golang.org/x/time v0.14.0
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
-	cel.dev/expr v0.24.0 // indirect
-	cloud.google.com/go/auth v0.16.4 // indirect
+	cel.dev/expr v0.25.1 // indirect
+	cloud.google.com/go/auth v0.18.1 // indirect
 	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
-	cloud.google.com/go/compute/metadata v0.8.0 // indirect
-	dario.cat/mergo v1.0.1 // indirect
-	github.com/Microsoft/go-winio v0.6.0 // indirect
-	github.com/antlr4-go/antlr/v4 v4.13.0 // indirect
-	github.com/ccoveille/go-safecast v1.6.1 // indirect
+	cloud.google.com/go/compute/metadata v0.9.0 // indirect
+	dario.cat/mergo v1.0.2 // indirect
+	filippo.io/bigmod v0.1.0 // indirect
+	github.com/antlr4-go/antlr/v4 v4.13.1 // indirect
+	github.com/ccoveille/go-safecast/v2 v2.0.0 // indirect
 	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
-	github.com/coreos/go-oidc/v3 v3.14.1 // indirect
+	github.com/coreos/go-oidc/v3 v3.17.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/francoispqt/gojay v1.2.13 // indirect
-	github.com/fxamacker/cbor/v2 v2.8.0 // indirect
+	github.com/fxamacker/cbor/v2 v2.9.0 // indirect
 	github.com/go-jose/go-jose/v3 v3.0.4 // indirect
-	github.com/go-jose/go-jose/v4 v4.1.1 // indirect
+	github.com/go-jose/go-jose/v4 v4.1.3 // indirect
 	github.com/google/certificate-transparency-go v1.1.8-0.20240110162603-74a5dd331745 // indirect
-	github.com/google/go-tpm v0.9.5 // indirect
+	github.com/google/go-tpm v0.9.8 // indirect
 	github.com/google/go-tspi v0.3.0 // indirect
 	github.com/google/s2a-go v0.1.9 // indirect
-	github.com/googleapis/enterprise-certificate-proxy v0.3.6 // indirect
-	github.com/googleapis/gax-go/v2 v2.15.0 // indirect
-	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.2 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.11 // indirect
+	github.com/googleapis/gax-go/v2 v2.17.0 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.7 // indirect
 	github.com/jackc/pgx/v5 v5.6.0 // indirect
 	github.com/jackc/puddle/v2 v2.2.1 // indirect
 	github.com/kylelemons/godebug v1.1.0 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/quic-go/qpack v0.5.1 // indirect
-	github.com/smallstep/cli-utils v0.12.1 // indirect
+	github.com/prometheus/otlptranslator v1.0.0 // indirect
+	github.com/quic-go/qpack v0.6.0 // indirect
+	github.com/smallstep/cli-utils v0.12.2 // indirect
 	github.com/smallstep/go-attestation v0.4.4-0.20241119153605-2306d5b464ca // indirect
-	github.com/smallstep/linkedca v0.23.0 // indirect
+	github.com/smallstep/linkedca v0.25.0 // indirect
 	github.com/smallstep/pkcs7 v0.2.1 // indirect
-	github.com/smallstep/scep v0.0.0-20240926084937-8cf1ca453101 // indirect
+	github.com/smallstep/scep v0.0.0-20250318231241-a25cabb69492 // indirect
+	github.com/tailscale/go-winio v0.0.0-20231025203758-c4f33415bf55 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
 	github.com/zeebo/blake3 v0.2.4 // indirect
-	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
-	go.opentelemetry.io/contrib/propagators/aws v1.38.0 // indirect
-	go.opentelemetry.io/contrib/propagators/b3 v1.38.0 // indirect
-	go.opentelemetry.io/contrib/propagators/jaeger v1.38.0 // indirect
-	go.opentelemetry.io/contrib/propagators/ot v1.38.0 // indirect
+	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
+	go.opentelemetry.io/contrib/bridges/prometheus v0.65.0 // indirect
+	go.opentelemetry.io/contrib/propagators/aws v1.40.0 // indirect
+	go.opentelemetry.io/contrib/propagators/b3 v1.40.0 // indirect
+	go.opentelemetry.io/contrib/propagators/jaeger v1.40.0 // indirect
+	go.opentelemetry.io/contrib/propagators/ot v1.40.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.16.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.16.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.40.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.40.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.40.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.40.0 // indirect
+	go.opentelemetry.io/otel/exporters/prometheus v0.62.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdoutlog v0.16.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.40.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.40.0 // indirect
+	go.opentelemetry.io/otel/log v0.16.0 // indirect
+	go.opentelemetry.io/otel/sdk/log v0.16.0 // indirect
+	go.opentelemetry.io/otel/sdk/metric v1.40.0 // indirect
 	go.yaml.in/yaml/v2 v2.4.3 // indirect
-	golang.org/x/exp v0.0.0-20250813145105-42675adae3e6 // indirect
-	golang.org/x/oauth2 v0.31.0 // indirect
-	google.golang.org/api v0.247.0 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20250825161204-c5933d9347a5 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20251002232023-7c0ddcbb5797 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 // indirect
+	golang.org/x/oauth2 v0.35.0 // indirect
+	google.golang.org/api v0.266.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20260128011058-8636f8732409 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260203192932-546029d2fa20 // indirect
 	google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.5.1 // indirect
 )
 
 require (
-	filippo.io/edwards25519 v1.1.0 // indirect
+	filippo.io/edwards25519 v1.2.0 // indirect
 	github.com/AndreasBriese/bbloom v0.0.0-20190825152654-46b345b51c96 // indirect
 	github.com/Masterminds/goutils v1.1.1 // indirect
-	github.com/Masterminds/semver/v3 v3.3.0 // indirect
+	github.com/Masterminds/semver/v3 v3.4.0 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash v1.1.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0
@@ -125,39 +142,37 @@ require (
 	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
 	github.com/libdns/libdns v1.1.1
 	github.com/manifoldco/promptui v0.9.0 // indirect
-	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-colorable v0.1.14 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mgutz/ansi v0.0.0-20200706080929-d51e80ef957d // indirect
-	github.com/miekg/dns v1.1.68 // indirect
+	github.com/miekg/dns v1.1.72 // indirect
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/go-ps v1.0.0 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
-	github.com/pires/go-proxyproto v0.8.1
+	github.com/pires/go-proxyproto v0.11.0
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/prometheus/client_model v0.6.2
-	github.com/prometheus/common v0.67.1 // indirect
-	github.com/prometheus/procfs v0.17.0 // indirect
+	github.com/prometheus/common v0.67.5 // indirect
+	github.com/prometheus/procfs v0.19.2 // indirect
 	github.com/rs/xid v1.6.0 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/shopspring/decimal v1.4.0 // indirect
 	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
-	github.com/sirupsen/logrus v1.9.3 // indirect
-	github.com/slackhq/nebula v1.9.5 // indirect
+	github.com/sirupsen/logrus v1.9.4 // indirect
+	github.com/slackhq/nebula v1.10.3 // indirect
 	github.com/spf13/cast v1.7.0 // indirect
-	github.com/stoewer/go-strcase v1.2.0 // indirect
 	github.com/urfave/cli v1.22.17 // indirect
 	go.etcd.io/bbolt v1.3.10 // indirect
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.38.0 // indirect
-	go.opentelemetry.io/otel/metric v1.38.0 // indirect
-	go.opentelemetry.io/otel/trace v1.38.0
-	go.opentelemetry.io/proto/otlp v1.7.1 // indirect
-	go.step.sm/crypto v0.70.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.40.0 // indirect
+	go.opentelemetry.io/otel/metric v1.40.0 // indirect
+	go.opentelemetry.io/otel/trace v1.40.0
+	go.opentelemetry.io/proto/otlp v1.9.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
-	golang.org/x/mod v0.29.0 // indirect
-	golang.org/x/sys v0.37.0
-	golang.org/x/text v0.30.0 // indirect
-	golang.org/x/tools v0.38.0 // indirect
-	google.golang.org/grpc v1.75.1 // indirect
-	google.golang.org/protobuf v1.36.10 // indirect
+	golang.org/x/mod v0.33.0 // indirect
+	golang.org/x/sys v0.41.0
+	golang.org/x/text v0.34.0
+	golang.org/x/tools v0.42.0 // indirect
+	google.golang.org/grpc v1.79.1 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
 	howett.net/plist v1.0.0 // indirect
 )

go.sum

@@ -1,104 +1,96 @@
-cel.dev/expr v0.24.0 h1:56OvJKSH3hDGL0ml5uSxZmz3/3Pq4tJ+fb1unVLAFcY=
-cel.dev/expr v0.24.0/go.mod h1:hLPLo1W4QUmuYdA72RBX06QTs6MXw941piREPl3Yfiw=
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.31.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.37.0/go.mod h1:TS1dMSSfndXH133OKGwekG838Om/cQT0BUHV3HcBgoo=
-cloud.google.com/go v0.120.0 h1:wc6bgG9DHyKqF5/vQvX1CiZrtHnxJjBlKUyF9nP6meA=
-cloud.google.com/go v0.120.0/go.mod h1:/beW32s8/pGRuj4IILWQNd4uuebeT4dkOhKmkfit64Q=
-cloud.google.com/go/auth v0.16.4 h1:fXOAIQmkApVvcIn7Pc2+5J8QTMVbUGLscnSVNl11su8=
-cloud.google.com/go/auth v0.16.4/go.mod h1:j10ncYwjX/g3cdX7GpEzsdM+d+ZNsXAbb6qXA7p1Y5M=
+cel.dev/expr v0.25.1 h1:1KrZg61W6TWSxuNZ37Xy49ps13NUovb66QLprthtwi4=
+cel.dev/expr v0.25.1/go.mod h1:hrXvqGP6G6gyx8UAHSHJ5RGk//1Oj5nXQ2NI02Nrsg4=
+cloud.google.com/go v0.123.0 h1:2NAUJwPR47q+E35uaJeYoNhuNEM9kM8SjgRgdeOJUSE=
+cloud.google.com/go v0.123.0/go.mod h1:xBoMV08QcqUGuPW65Qfm1o9Y4zKZBpGS+7bImXLTAZU=
+cloud.google.com/go/auth v0.18.1 h1:IwTEx92GFUo2pJ6Qea0EU3zYvKnTAeRCODxfA/G5UWs=
+cloud.google.com/go/auth v0.18.1/go.mod h1:GfTYoS9G3CWpRA3Va9doKN9mjPGRS+v41jmZAhBzbrA=
 cloud.google.com/go/auth/oauth2adapt v0.2.8 h1:keo8NaayQZ6wimpNSmW5OPc283g65QNIiLpZnkHRbnc=
 cloud.google.com/go/auth/oauth2adapt v0.2.8/go.mod h1:XQ9y31RkqZCcwJWNSx2Xvric3RrU88hAYYbjDWYDL+c=
-cloud.google.com/go/compute/metadata v0.8.0 h1:HxMRIbao8w17ZX6wBnjhcDkW6lTFpgcaobyVfZWqRLA=
-cloud.google.com/go/compute/metadata v0.8.0/go.mod h1:sYOGTp851OV9bOFJ9CH7elVvyzopvWQFNNghtDQ/Biw=
-cloud.google.com/go/iam v1.5.2 h1:qgFRAGEmd8z6dJ/qyEchAuL9jpswyODjA2lS+w234g8=
-cloud.google.com/go/iam v1.5.2/go.mod h1:SE1vg0N81zQqLzQEwxL2WI6yhetBdbNQuTvIKCSkUHE=
-cloud.google.com/go/kms v1.22.0 h1:dBRIj7+GDeeEvatJeTB19oYZNV0aj6wEqSIT/7gLqtk=
-cloud.google.com/go/kms v1.22.0/go.mod h1:U7mf8Sva5jpOb4bxYZdtw/9zsbIjrklYwPcvMk34AL8=
-cloud.google.com/go/longrunning v0.6.7 h1:IGtfDWHhQCgCjwQjV9iiLnUta9LBCo8R9QmAFsS/PrE=
-cloud.google.com/go/longrunning v0.6.7/go.mod h1:EAFV3IZAKmM56TyiE6VAP3VoTzhZzySwI/YI1s/nRsY=
-dario.cat/mergo v1.0.1 h1:Ra4+bf83h2ztPIQYNP99R6m+Y7KfnARDfID+a+vLl4s=
-dario.cat/mergo v1.0.1/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
-dmitri.shuralyov.com/app/changes v0.0.0-20180602232624-0a106ad413e3/go.mod h1:Yl+fi1br7+Rr3LqpNJf1/uxUdtRUV+Tnj0o93V2B9MU=
-dmitri.shuralyov.com/html/belt v0.0.0-20180602232347-f7d459c86be0/go.mod h1:JLBrvjyP0v+ecvNYvCpyZgu5/xkfAUhi6wJj28eUfSU=
-dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1:a1inKt/atXimZ4Mv927x+r7UpyzRUf4emIoiiSC2TN4=
-dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU=
-filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
-filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
-git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
+cloud.google.com/go/compute/metadata v0.9.0 h1:pDUj4QMoPejqq20dK0Pg2N4yG9zIkYGdBtwLoEkH9Zs=
+cloud.google.com/go/compute/metadata v0.9.0/go.mod h1:E0bWwX5wTnLPedCKqk3pJmVgCBSM6qQI1yTBdEb3C10=
+cloud.google.com/go/iam v1.5.3 h1:+vMINPiDF2ognBJ97ABAYYwRgsaqxPbQDlMnbHMjolc=
+cloud.google.com/go/iam v1.5.3/go.mod h1:MR3v9oLkZCTlaqljW6Eb2d3HGDGK5/bDv93jhfISFvU=
+cloud.google.com/go/kms v1.25.0 h1:gVqvGGUmz0nYCmtoxWmdc1wli2L1apgP8U4fghPGSbQ=
+cloud.google.com/go/kms v1.25.0/go.mod h1:XIdHkzfj0bUO3E+LvwPg+oc7s58/Ns8Nd8Sdtljihbk=
+cloud.google.com/go/longrunning v0.8.0 h1:LiKK77J3bx5gDLi4SMViHixjD2ohlkwBi+mKA7EhfW8=
+cloud.google.com/go/longrunning v0.8.0/go.mod h1:UmErU2Onzi+fKDg2gR7dusz11Pe26aknR4kHmJJqIfk=
+code.pfad.fr/check v1.1.0 h1:GWvjdzhSEgHvEHe2uJujDcpmZoySKuHQNrZMfzfO0bE=
+code.pfad.fr/check v1.1.0/go.mod h1:NiUH13DtYsb7xp5wll0U4SXx7KhXQVCtRgdC96IPfoM=
+dario.cat/mergo v1.0.2 h1:85+piFYR1tMbRrLcDwR18y4UKJ3aH1Tbzi24VRW1TK8=
+dario.cat/mergo v1.0.2/go.mod h1:E/hbnu0NxMFBjpMIE34DRGLWqDy0g5FuKDhCb31ngxA=
+filippo.io/bigmod v0.1.0 h1:UNzDk7y9ADKST+axd9skUpBQeW7fG2KrTZyOE4uGQy8=
+filippo.io/bigmod v0.1.0/go.mod h1:OjOXDNlClLblvXdwgFFOQFJEocLhhtai8vGLy0JCZlI=
+filippo.io/edwards25519 v1.2.0 h1:crnVqOiS4jqYleHd9vaKZ+HKtHfllngJIiOpNpoJsjo=
+filippo.io/edwards25519 v1.2.0/go.mod h1:xzAOLCNug/yB62zG1bQ8uziwrIqIuxhctzJT18Q77mc=
 github.com/AndreasBriese/bbloom v0.0.0-20190825152654-46b345b51c96 h1:cTp8I5+VIoKjsnZuH8vjyaysT/ses3EvZeaV/1UkF2M=
 github.com/AndreasBriese/bbloom v0.0.0-20190825152654-46b345b51c96/go.mod h1:bOvUY6CB00SOBii9/FifXqc0awNKxLFCL/+pkDPuyl8=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/BurntSushi/toml v1.5.0 h1:W5quZX/G/csjUnuI8SUYlsHs9M38FC7znL0lIO+DvMg=
 github.com/BurntSushi/toml v1.5.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
-github.com/DeRuina/timberjack v1.3.8 h1:lLxmRExvZygKSbb27Vp9hS0Tv8mL0WmFbwfRF29nY0Q=
-github.com/DeRuina/timberjack v1.3.8/go.mod h1:RLoeQrwrCGIEF8gO5nV5b/gMD0QIy7bzQhBUgpp1EqE=
-github.com/KimMachineGun/automemlimit v0.7.4 h1:UY7QYOIfrr3wjjOAqahFmC3IaQCLWvur9nmfIn6LnWk=
-github.com/KimMachineGun/automemlimit v0.7.4/go.mod h1:QZxpHaGOQoYvFhv/r4u3U0JTC2ZcOwbSr11UZF46UBM=
+github.com/BurntSushi/toml v1.6.0 h1:dRaEfpa2VI55EwlIW72hMRHdWouJeRF7TPYhI+AUQjk=
+github.com/BurntSushi/toml v1.6.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
+github.com/DeRuina/timberjack v1.3.9 h1:6UXZ1I7ExPGTX/1UNYawR58LlOJUHKBPiYC7WQ91eBo=
+github.com/DeRuina/timberjack v1.3.9/go.mod h1:RLoeQrwrCGIEF8gO5nV5b/gMD0QIy7bzQhBUgpp1EqE=
+github.com/KimMachineGun/automemlimit v0.7.5 h1:RkbaC0MwhjL1ZuBKunGDjE/ggwAX43DwZrJqVwyveTk=
+github.com/KimMachineGun/automemlimit v0.7.5/go.mod h1:QZxpHaGOQoYvFhv/r4u3U0JTC2ZcOwbSr11UZF46UBM=
 github.com/Masterminds/goutils v1.1.1 h1:5nUrii3FMTL5diU80unEVvNevw1nH4+ZV4DSLVJLSYI=
 github.com/Masterminds/goutils v1.1.1/go.mod h1:8cTjp+g8YejhMuvIA5y2vz3BpJxksy863GQaJW2MFNU=
-github.com/Masterminds/semver/v3 v3.3.0 h1:B8LGeaivUe71a5qox1ICM/JLl0NqZSW5CHyL+hmvYS0=
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@@ -398,15 +325,14 @@ github.com/spf13/cast v1.3.0/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkU
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@@ -414,7 +340,6 @@ github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/
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@@ -422,21 +347,20 @@ github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXl
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@@ -598,12 +516,10 @@ golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
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@@ -611,76 +527,45 @@ golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
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-google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
-google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/grpc v1.75.1 h1:/ODCNEuf9VghjgO3rqLcfg8fiOP0nSluljWFlDxELLI=
-google.golang.org/grpc v1.75.1/go.mod h1:JtPAzKiq4v1xcAB2hydNlWI2RnF85XXcV0mhKXr2ecQ=
+google.golang.org/api v0.266.0 h1:hco+oNCf9y7DmLeAtHJi/uBAY7n/7XC9mZPxu1ROiyk=
+google.golang.org/api v0.266.0/go.mod h1:Jzc0+ZfLnyvXma3UtaTl023TdhZu6OMBP9tJ+0EmFD0=
+google.golang.org/genproto v0.0.0-20260128011058-8636f8732409 h1:VQZ/yAbAtjkHgH80teYd2em3xtIkkHd7ZhqfH2N9CsM=
+google.golang.org/genproto v0.0.0-20260128011058-8636f8732409/go.mod h1:rxKD3IEILWEu3P44seeNOAwZN4SaoKaQ/2eTg4mM6EM=
+google.golang.org/genproto/googleapis/api v0.0.0-20260128011058-8636f8732409 h1:merA0rdPeUV3YIIfHHcH4qBkiQAc1nfCKSI7lB4cV2M=
+google.golang.org/genproto/googleapis/api v0.0.0-20260128011058-8636f8732409/go.mod h1:fl8J1IvUjCilwZzQowmw2b7HQB2eAuYBabMXzWurF+I=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260203192932-546029d2fa20 h1:Jr5R2J6F6qWyzINc+4AM8t5pfUz6beZpHp678GNrMbE=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260203192932-546029d2fa20/go.mod h1:j9x/tPzZkyxcgEFkiKEEGxfvyumM01BEtsW8xzOahRQ=
+google.golang.org/grpc v1.79.1 h1:zGhSi45ODB9/p3VAawt9a+O/MULLl9dpizzNNpq7flY=
+google.golang.org/grpc v1.79.1/go.mod h1:KmT0Kjez+0dde/v2j9vzwoAScgEPx/Bw1CYChhHLrHQ=
 google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.5.1 h1:F29+wU6Ee6qgu9TddPgooOdaqsxTMunOoj8KA5yuS5A=
 google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.5.1/go.mod h1:5KF+wpkbTSbGcR9zteSqZV6fqFOWBl4Yde8En8MryZA=
-google.golang.org/protobuf v1.36.10 h1:AYd7cD/uASjIL6Q9LiTjz8JLcrh/88q5UObnmY3aOOE=
-google.golang.org/protobuf v1.36.10/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
+google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
+google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
-gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
 gopkg.in/yaml.v1 v1.0.0-20140924161607-9f9df34309c0/go.mod h1:WDnlLJ4WF5VGsH/HVa3CI79GS0ol3YnhVnKP89i0kNg=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-grpc.go4.org v0.0.0-20170609214715-11d0a25b4919/go.mod h1:77eQGdRu53HpSqPFJFmuJdjuHRquDANNeA4x7B8WQ9o=
-honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 howett.net/plist v1.0.0 h1:7CrbWYbPPO/PyNy38b2EB/+gYbjCe2DXBxgtOOZbSQM=
 howett.net/plist v1.0.0/go.mod h1:lqaXoTrLY4hg8tnEzNru53gicrbv7rrk+2xJA/7hw9g=
-sourcegraph.com/sourcegraph/go-diff v0.5.0/go.mod h1:kuch7UrkMzY0X+p9CRK03kfuPQ2zzQcaEFbx8wA8rck=
-sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=

listeners.go

@@ -31,7 +31,7 @@ import (
 
 	"github.com/quic-go/quic-go"
 	"github.com/quic-go/quic-go/http3"
-	"github.com/quic-go/quic-go/qlog"
+	h3qlog "github.com/quic-go/quic-go/http3/qlog"
 	"go.uber.org/zap"
 	"golang.org/x/time/rate"
 
@@ -229,7 +229,7 @@ func (na NetworkAddress) JoinHostPort(offset uint) string {
 func (na NetworkAddress) Expand() []NetworkAddress {
 	size := na.PortRangeSize()
 	addrs := make([]NetworkAddress, size)
-	for portOffset := uint(0); portOffset < size; portOffset++ {
+	for portOffset := range size {
 		addrs[portOffset] = na.At(portOffset)
 	}
 	return addrs
@@ -431,7 +431,7 @@ func JoinNetworkAddress(network, host, port string) string {
 //
 // NOTE: This API is EXPERIMENTAL and may be changed or removed.
 // NOTE: user should close the returned listener twice, once to stop accepting new connections, the second time to free up the packet conn.
-func (na NetworkAddress) ListenQUIC(ctx context.Context, portOffset uint, config net.ListenConfig, tlsConf *tls.Config) (http3.QUICListener, error) {
+func (na NetworkAddress) ListenQUIC(ctx context.Context, portOffset uint, config net.ListenConfig, tlsConf *tls.Config, pcWrappers []PacketConnWrapper, allow0rttconf *bool) (http3.QUICListener, error) {
 	lnKey := listenerKey("quic"+na.Network, na.JoinHostPort(portOffset))
 
 	sharedEarlyListener, _, err := listenerPool.LoadOrNew(lnKey, func() (Destructor, error) {
@@ -443,12 +443,19 @@ func (na NetworkAddress) ListenQUIC(ctx context.Context, portOffset uint, config
 		ln := lnAny.(net.PacketConn)
 
 		h3ln := ln
-		for {
-			// retrieve the underlying socket, so quic-go can optimize.
-			if unwrapper, ok := h3ln.(interface{ Unwrap() net.PacketConn }); ok {
-				h3ln = unwrapper.Unwrap()
-			} else {
-				break
+		if len(pcWrappers) == 0 {
+			for {
+				// retrieve the underlying socket, so quic-go can optimize.
+				if unwrapper, ok := h3ln.(interface{ Unwrap() net.PacketConn }); ok {
+					h3ln = unwrapper.Unwrap()
+				} else {
+					break
+				}
+			}
+		} else {
+			// wrap packet conn before QUIC
+			for _, pcWrapper := range pcWrappers {
+				h3ln = pcWrapper.WrapPacketConn(h3ln)
 			}
 		}
 
@@ -463,11 +470,15 @@ func (na NetworkAddress) ListenQUIC(ctx context.Context, portOffset uint, config
 			Conn:                h3ln,
 			VerifySourceAddress: func(addr net.Addr) bool { return !limiter.Allow() },
 		}
+		allow0rtt := true
+		if allow0rttconf != nil {
+			allow0rtt = *allow0rttconf
+		}
 		earlyLn, err := tr.ListenEarly(
 			http3.ConfigureTLSConfig(quicTlsConfig),
 			&quic.Config{
-				Allow0RTT: true,
-				Tracer:    qlog.DefaultConnectionTracer,
+				Allow0RTT: allow0rtt,
+				Tracer:    h3qlog.DefaultConnectionTracer,
 			},
 		)
 		if err != nil {
@@ -501,7 +512,7 @@ func ListenerUsage(network, addr string) int {
 // contextAndCancelFunc groups context and its cancelFunc
 type contextAndCancelFunc struct {
 	context.Context
-	context.CancelFunc
+	context.CancelCauseFunc
 }
 
 // sharedQUICState manages GetConfigForClient
@@ -531,17 +542,17 @@ func (sqs *sharedQUICState) getConfigForClient(ch *tls.ClientHelloInfo) (*tls.Co
 
 // addState adds tls.Config and activeRequests to the map if not present and returns the corresponding context and its cancelFunc
 // so that when cancelled, the active tls.Config will change
-func (sqs *sharedQUICState) addState(tlsConfig *tls.Config) (context.Context, context.CancelFunc) {
+func (sqs *sharedQUICState) addState(tlsConfig *tls.Config) (context.Context, context.CancelCauseFunc) {
 	sqs.rmu.Lock()
 	defer sqs.rmu.Unlock()
 
 	if cacc, ok := sqs.tlsConfs[tlsConfig]; ok {
-		return cacc.Context, cacc.CancelFunc
+		return cacc.Context, cacc.CancelCauseFunc
 	}
 
-	ctx, cancel := context.WithCancel(context.Background())
-	wrappedCancel := func() {
-		cancel()
+	ctx, cancel := context.WithCancelCause(context.Background())
+	wrappedCancel := func(cause error) {
+		cancel(cause)
 
 		sqs.rmu.Lock()
 		defer sqs.rmu.Unlock()
@@ -597,13 +608,13 @@ func fakeClosedErr(l interface{ Addr() net.Addr }) error {
 // indicating that it is pretending to be closed so that the
 // server using it can terminate, while the underlying
 // socket is actually left open.
-var errFakeClosed = fmt.Errorf("listener 'closed' 😉")
+var errFakeClosed = fmt.Errorf("QUIC listener 'closed' 😉")
 
 type fakeCloseQuicListener struct {
 	closed              int32 // accessed atomically; belongs to this struct only
 	*sharedQuicListener       // embedded, so we also become a quic.EarlyListener
 	context             context.Context
-	contextCancel       context.CancelFunc
+	contextCancel       context.CancelCauseFunc
 }
 
 // Currently Accept ignores the passed context, however a situation where
@@ -626,7 +637,7 @@ func (fcql *fakeCloseQuicListener) Accept(_ context.Context) (*quic.Conn, error)
 
 func (fcql *fakeCloseQuicListener) Close() error {
 	if atomic.CompareAndSwapInt32(&fcql.closed, 0, 1) {
-		fcql.contextCancel()
+		fcql.contextCancel(errFakeClosed)
 	} else if atomic.CompareAndSwapInt32(&fcql.closed, 1, 2) {
 		_, _ = listenerPool.Delete(fcql.sharedQuicListener.key)
 	}
@@ -695,6 +706,19 @@ type ListenerWrapper interface {
 	WrapListener(net.Listener) net.Listener
 }
 
+// PacketConnWrapper is a type that wraps a packet conn
+// so it can modify the input packet conn methods.
+// Modules that implement this interface are found
+// in the caddy.packetconns namespace. Usually, to
+// wrap a packet conn, you will define your own struct
+// type that embeds the input packet conn, then
+// implement your own methods that you want to wrap,
+// calling the underlying packet conn methods where
+// appropriate.
+type PacketConnWrapper interface {
+	WrapPacketConn(net.PacketConn) net.PacketConn
+}
+
 // listenerPool stores and allows reuse of active listeners.
 var listenerPool = NewUsagePool()
 

modules.go

@@ -342,7 +342,11 @@ func ParseStructTag(tag string) (map[string]string, error) {
 func StrictUnmarshalJSON(data []byte, v any) error {
 	dec := json.NewDecoder(bytes.NewReader(data))
 	dec.DisallowUnknownFields()
-	return dec.Decode(v)
+	err := dec.Decode(v)
+	if jsonErr, ok := err.(*json.SyntaxError); ok {
+		return fmt.Errorf("%w, at offset %d", jsonErr, jsonErr.Offset)
+	}
+	return err
 }
 
 var JSONRawMessageType = reflect.TypeFor[json.RawMessage]()

modules/caddyhttp/app.go

@@ -18,6 +18,7 @@ import (
 	"cmp"
 	"context"
 	"crypto/tls"
+	"errors"
 	"fmt"
 	"maps"
 	"net"
@@ -51,6 +52,7 @@ func init() {
 // Placeholder | Description
 // ------------|---------------
 // `{http.request.body}` | The request body (⚠️ inefficient; use only for debugging)
+// `{http.request.body_base64}` | The request body, base64-encoded (⚠️ for debugging)
 // `{http.request.cookie.*}` | HTTP request cookie
 // `{http.request.duration}` | Time up to now spent handling the request (after decoding headers from client)
 // `{http.request.duration_ms}` | Same as 'duration', but in milliseconds.
@@ -82,6 +84,7 @@ func init() {
 // `{http.request.tls.proto}` | The negotiated next protocol
 // `{http.request.tls.proto_mutual}` | The negotiated next protocol was advertised by the server
 // `{http.request.tls.server_name}` | The server name requested by the client, if any
+// `{http.request.tls.ech}` | Whether ECH was offered by the client and accepted by the server
 // `{http.request.tls.client.fingerprint}` | The SHA256 checksum of the client certificate
 // `{http.request.tls.client.public_key}` | The public key of the client certificate.
 // `{http.request.tls.client.public_key_sha256}` | The SHA256 checksum of the client's public key.
@@ -198,6 +201,8 @@ func (app *App) Provision(ctx caddy.Context) error {
 	if app.Metrics != nil {
 		app.Metrics.init = sync.Once{}
 		app.Metrics.httpMetrics = &httpMetrics{}
+		// Scan config for allowed hosts to prevent cardinality explosion
+		app.Metrics.scanConfigForHosts(app)
 	}
 	// prepare each server
 	oldContext := ctx.Context
@@ -344,6 +349,20 @@ func (app *App) Provision(ctx caddy.Context) error {
 				srv.listenerWrappers = append([]caddy.ListenerWrapper{new(tlsPlaceholderWrapper)}, srv.listenerWrappers...)
 			}
 		}
+
+		// set up each packet conn modifier
+		if srv.PacketConnWrappersRaw != nil {
+			vals, err := ctx.LoadModule(srv, "PacketConnWrappersRaw")
+			if err != nil {
+				return fmt.Errorf("loading packet conn wrapper modules: %v", err)
+			}
+			// if any wrappers were configured, they come before the QUIC handshake;
+			// unlike TLS above, there is no QUIC placeholder
+			for _, val := range vals.([]any) {
+				srv.packetConnWrappers = append(srv.packetConnWrappers, val.(caddy.PacketConnWrapper))
+			}
+		}
+
 		// pre-compile the primary handler chain, and be sure to wrap it in our
 		// route handler so that important security checks are done, etc.
 		primaryRoute := emptyHandler
@@ -693,9 +712,10 @@ func (app *App) Stop() error {
 	// enforce grace period if configured
 	if app.GracePeriod > 0 {
 		var cancel context.CancelFunc
-		ctx, cancel = context.WithTimeout(ctx, time.Duration(app.GracePeriod))
+		timeout := time.Duration(app.GracePeriod)
+		ctx, cancel = context.WithTimeoutCause(ctx, timeout, fmt.Errorf("server graceful shutdown %ds timeout", int(timeout.Seconds())))
 		defer cancel()
-		app.logger.Info("servers shutting down; grace period initiated", zap.Duration("duration", time.Duration(app.GracePeriod)))
+		app.logger.Info("servers shutting down; grace period initiated", zap.Duration("duration", timeout))
 	} else {
 		app.logger.Info("servers shutting down with eternal grace period")
 	}
@@ -721,6 +741,9 @@ func (app *App) Stop() error {
 		}
 
 		if err := server.server.Shutdown(ctx); err != nil {
+			if cause := context.Cause(ctx); cause != nil && errors.Is(err, context.DeadlineExceeded) {
+				err = cause
+			}
 			app.logger.Error("server shutdown",
 				zap.Error(err),
 				zap.Strings("addresses", server.Listen))
@@ -744,6 +767,9 @@ func (app *App) Stop() error {
 		}
 
 		if err := server.h3server.Shutdown(ctx); err != nil {
+			if cause := context.Cause(ctx); cause != nil && errors.Is(err, context.DeadlineExceeded) {
+				err = cause
+			}
 			app.logger.Error("HTTP/3 server shutdown",
 				zap.Error(err),
 				zap.Strings("addresses", server.Listen))

modules/caddyhttp/autohttps.go

@@ -90,7 +90,16 @@ func (app *App) automaticHTTPSPhase1(ctx caddy.Context, repl *caddy.Replacer) er
 	// the log configuration for an HTTPS enabled server
 	var logCfg *ServerLogConfig
 
-	for srvName, srv := range app.Servers {
+	// Sort server names to ensure deterministic iteration.
+	// This prevents race conditions where the order of server processing
+	// could affect which server gets assigned the HTTP->HTTPS redirect listener.
+	srvNames := make([]string, 0, len(app.Servers))
+	for name := range app.Servers {
+		srvNames = append(srvNames, name)
+	}
+	slices.Sort(srvNames)
+	for _, srvName := range srvNames {
+		srv := app.Servers[srvName]
 		// as a prerequisite, provision route matchers; this is
 		// required for all routes on all servers, and must be
 		// done before we attempt to do phase 1 of auto HTTPS,
@@ -398,15 +407,60 @@ uniqueDomainsLoop:
 		return append(routes, app.makeRedirRoute(uint(app.httpsPort()), MatcherSet{MatchProtocol("http")}))
 	}
 
+	// Sort redirect addresses to ensure deterministic process
+	redirServerAddrsSorted := make([]string, 0, len(redirServers))
+	for addr := range redirServers {
+		redirServerAddrsSorted = append(redirServerAddrsSorted, addr)
+	}
+	slices.Sort(redirServerAddrsSorted)
+
 redirServersLoop:
-	for redirServerAddr, routes := range redirServers {
+	for _, redirServerAddr := range redirServerAddrsSorted {
+		routes := redirServers[redirServerAddr]
 		// for each redirect listener, see if there's already a
 		// server configured to listen on that exact address; if so,
 		// insert the redirect route to the end of its route list
 		// after any other routes with host matchers; otherwise,
 		// we'll create a new server for all the listener addresses
 		// that are unused and serve the remaining redirects from it
-		for _, srv := range app.Servers {
+
+		// Sort redirect routes by host specificity to ensure exact matches
+		// take precedence over wildcards, preventing ambiguous routing.
+		slices.SortFunc(routes, func(a, b Route) int {
+			hostA := getFirstHostFromRoute(a)
+			hostB := getFirstHostFromRoute(b)
+
+			// Catch-all routes (empty host) have the lowest priority
+			if hostA == "" && hostB != "" {
+				return 1
+			}
+			if hostB == "" && hostA != "" {
+				return -1
+			}
+
+			hasWildcardA := strings.Contains(hostA, "*")
+			hasWildcardB := strings.Contains(hostB, "*")
+
+			// Exact domains take precedence over wildcards
+			if !hasWildcardA && hasWildcardB {
+				return -1
+			}
+			if hasWildcardA && !hasWildcardB {
+				return 1
+			}
+
+			// If both are exact or both are wildcards, the longer one is more specific
+			if len(hostA) != len(hostB) {
+				return len(hostB) - len(hostA)
+			}
+
+			// Tie-breaker: alphabetical order to ensure determinism
+			return strings.Compare(hostA, hostB)
+		})
+
+		// Use the sorted srvNames to consistently find the target server
+		for _, srvName := range srvNames {
+			srv := app.Servers[srvName]
 			// only look at servers which listen on an address which
 			// we want to add redirects to
 			if !srv.hasListenerAddress(redirServerAddr) {
@@ -560,6 +614,27 @@ func (app *App) createAutomationPolicies(ctx caddy.Context, internalNames, tails
 		}
 	}
 
+	// Ensure automation policies' CertMagic configs are rebuilt when
+	// ACME issuer templates may have been modified above (for example,
+	// alternate ports filled in by the HTTP app). If a policy is already
+	// provisioned, perform a lightweight rebuild of the CertMagic config
+	// so issuers receive SetConfig with the updated templates; otherwise
+	// run a normal Provision to initialize the policy.
+	for i, ap := range app.tlsApp.Automation.Policies {
+		// If the policy is already provisioned, rebuild only the CertMagic
+		// config so issuers get SetConfig with updated templates. Otherwise
+		// provision the policy normally (which may load modules).
+		if ap.IsProvisioned() {
+			if err := ap.RebuildCertMagic(app.tlsApp); err != nil {
+				return fmt.Errorf("rebuilding certmagic config for automation policy %d: %v", i, err)
+			}
+		} else {
+			if err := ap.Provision(app.tlsApp); err != nil {
+				return fmt.Errorf("provisioning automation policy %d after auto-HTTPS defaults: %v", i, err)
+			}
+		}
+	}
+
 	if basePolicy == nil {
 		// no base policy found; we will make one
 		basePolicy = new(caddytls.AutomationPolicy)
@@ -773,3 +848,26 @@ func isTailscaleDomain(name string) bool {
 }
 
 type acmeCapable interface{ GetACMEIssuer() *caddytls.ACMEIssuer }
+
+// getFirstHostFromRoute traverses a route's matchers to find the Host rule.
+// Since we are dealing with internally generated redirect routes, the host
+// is typically the first string within the MatchHost.
+func getFirstHostFromRoute(r Route) string {
+	for _, matcherSet := range r.MatcherSets {
+		for _, m := range matcherSet {
+			// Check if the matcher is of type MatchHost (value or pointer)
+			switch hm := m.(type) {
+			case MatchHost:
+				if len(hm) > 0 {
+					return hm[0]
+				}
+			case *MatchHost:
+				if len(*hm) > 0 {
+					return (*hm)[0]
+				}
+			}
+		}
+	}
+	// Return an empty string if it's a catch-all route (no specific host)
+	return ""
+}

modules/caddyhttp/caddyauth/basicauth.go

@@ -19,7 +19,7 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
-	weakrand "math/rand"
+	weakrand "math/rand/v2"
 	"net/http"
 	"strings"
 	"sync"
@@ -244,7 +244,7 @@ func (c *Cache) makeRoom() {
 		// strategy; generating random numbers is cheap and
 		// ensures a much better distribution.
 		//nolint:gosec
-		rnd := weakrand.Intn(len(c.cache))
+		rnd := weakrand.IntN(len(c.cache))
 		i := 0
 		for key := range c.cache {
 			if i == rnd {
@@ -287,7 +287,7 @@ type Account struct {
 
 	// The user's hashed password, in Modular Crypt Format (with `$` prefix)
 	// or base64-encoded.
-	Password string `json:"password"`
+	Password string `json:"password"` //nolint:gosec // false positive, this is a hashed password
 
 	password []byte
 }

modules/caddyhttp/celmatcher.go

@@ -412,10 +412,12 @@ func CELMatcherImpl(macroName, funcName string, matcherDataTypes []*cel.Type, fa
 			return nil, fmt.Errorf("unsupported matcher data type: %s, %s", matcherDataTypes[0], matcherDataTypes[1])
 		}
 	case 3:
+		// nolint:gosec // false positive, impossible to be out of bounds; see: https://github.com/securego/gosec/issues/1525
 		if matcherDataTypes[0] == cel.StringType && matcherDataTypes[1] == cel.StringType && matcherDataTypes[2] == cel.StringType {
 			macro = parser.NewGlobalMacro(macroName, 3, celMatcherStringListMacroExpander(funcName))
 			matcherDataTypes = []*cel.Type{cel.ListType(cel.StringType)}
 		} else {
+			// nolint:gosec // false positive, impossible to be out of bounds; see: https://github.com/securego/gosec/issues/1525
 			return nil, fmt.Errorf("unsupported matcher data type: %s, %s, %s", matcherDataTypes[0], matcherDataTypes[1], matcherDataTypes[2])
 		}
 	}
@@ -665,12 +667,29 @@ func celMatcherJSONMacroExpander(funcName string) parser.MacroExpander {
 // map literals containing heterogeneous values, in this case string and list
 // of string.
 func CELValueToMapStrList(data ref.Val) (map[string][]string, error) {
-	mapStrType := reflect.TypeOf(map[string]any{})
+	// Prefer map[string]any, but newer cel-go versions may return map[any]any
+	mapStrType := reflect.TypeFor[map[string]any]()
 	mapStrRaw, err := data.ConvertToNative(mapStrType)
+	var mapStrIface map[string]any
 	if err != nil {
-		return nil, err
+		// Try map[any]any and convert keys to strings
+		mapAnyType := reflect.TypeFor[map[any]any]()
+		mapAnyRaw, err2 := data.ConvertToNative(mapAnyType)
+		if err2 != nil {
+			return nil, err
+		}
+		mapAnyIface := mapAnyRaw.(map[any]any)
+		mapStrIface = make(map[string]any, len(mapAnyIface))
+		for k, v := range mapAnyIface {
+			ks, ok := k.(string)
+			if !ok {
+				return nil, fmt.Errorf("unsupported map key type in header match: %T", k)
+			}
+			mapStrIface[ks] = v
+		}
+	} else {
+		mapStrIface = mapStrRaw.(map[string]any)
 	}
-	mapStrIface := mapStrRaw.(map[string]any)
 	mapStrListStr := make(map[string][]string, len(mapStrIface))
 	for k, v := range mapStrIface {
 		switch val := v.(type) {
@@ -685,13 +704,26 @@ func CELValueToMapStrList(data ref.Val) (map[string][]string, error) {
 			for i, elem := range val {
 				strVal, ok := elem.(types.String)
 				if !ok {
-					return nil, fmt.Errorf("unsupported value type in header match: %T", val)
+					return nil, fmt.Errorf("unsupported value type in matcher input: %T", val)
 				}
 				convVals[i] = string(strVal)
 			}
 			mapStrListStr[k] = convVals
+		case []any:
+			convVals := make([]string, len(val))
+			for i, elem := range val {
+				switch e := elem.(type) {
+				case string:
+					convVals[i] = e
+				case types.String:
+					convVals[i] = string(e)
+				default:
+					return nil, fmt.Errorf("unsupported element type in matcher input list: %T", elem)
+				}
+			}
+			mapStrListStr[k] = convVals
 		default:
-			return nil, fmt.Errorf("unsupported value type in header match: %T", val)
+			return nil, fmt.Errorf("unsupported value type in matcher input: %T", val)
 		}
 	}
 	return mapStrListStr, nil

modules/caddyhttp/encode/encode.go

@@ -168,8 +168,8 @@ func (enc *Encode) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyh
 			// caches without knowing about our changes...
 			if etag := r.Header.Get("If-None-Match"); etag != "" && !strings.HasPrefix(etag, "W/") {
 				ourSuffix := "-" + encName + `"`
-				if strings.HasSuffix(etag, ourSuffix) {
-					etag = strings.TrimSuffix(etag, ourSuffix) + `"`
+				if before, ok := strings.CutSuffix(etag, ourSuffix); ok {
+					etag = before + `"`
 					r.Header.Set("If-None-Match", etag)
 				}
 			}

modules/caddyhttp/errors.go

@@ -17,7 +17,7 @@ package caddyhttp
 import (
 	"errors"
 	"fmt"
-	weakrand "math/rand"
+	weakrand "math/rand/v2"
 	"path"
 	"runtime"
 	"strings"
@@ -101,7 +101,7 @@ func randString(n int, sameCase bool) string {
 	b := make([]byte, n)
 	for i := range b {
 		//nolint:gosec
-		b[i] = dict[weakrand.Int63()%int64(len(dict))]
+		b[i] = dict[weakrand.IntN(len(dict))]
 	}
 	return string(b)
 }

modules/caddyhttp/fileserver/browse.go

@@ -169,6 +169,7 @@ func (fsrv *FileServer) serveBrowse(fileSystem fs.FS, root, dirPath string, w ht
 
 		// Actual files
 		for _, item := range listing.Items {
+			//nolint:gosec // not sure how this could be XSS unless you lose control of the file system (like aren't sanitizing) and client ignores Content-Type of text/plain
 			if _, err := fmt.Fprintf(writer, "%s\t%s\t%s\n",
 				item.Name, item.HumanSize(), item.HumanModTime("January 2, 2006 at 15:04:05"),
 			); err != nil {

modules/caddyhttp/fileserver/matcher.go

@@ -404,7 +404,7 @@ func (m MatchFile) selectFile(r *http.Request) (bool, error) {
 		}
 
 		// for each glob result, combine all the forms of the path
-		var candidates []matchCandidate
+		candidates := make([]matchCandidate, 0, len(globResults))
 		for _, result := range globResults {
 			candidates = append(candidates, matchCandidate{
 				fullpath:       result,
@@ -720,6 +720,7 @@ var globSafeRepl = strings.NewReplacer(
 	"*", "\\*",
 	"[", "\\[",
 	"?", "\\?",
+	"\\", "\\\\",
 )
 
 const (

modules/caddyhttp/fileserver/matcher_test.go

@@ -20,7 +20,9 @@ import (
 	"net/http/httptest"
 	"net/url"
 	"os"
+	"path/filepath"
 	"runtime"
+	"strings"
 	"testing"
 
 	"github.com/caddyserver/caddy/v2"
@@ -28,6 +30,13 @@ import (
 	"github.com/caddyserver/caddy/v2/modules/caddyhttp"
 )
 
+type testCase struct {
+	path         string
+	expectedPath string
+	expectedType string
+	matched      bool
+}
+
 func TestFileMatcher(t *testing.T) {
 	// Windows doesn't like colons in files names
 	isWindows := runtime.GOOS == "windows"
@@ -45,12 +54,7 @@ func TestFileMatcher(t *testing.T) {
 		f.Close()
 	}
 
-	for i, tc := range []struct {
-		path         string
-		expectedPath string
-		expectedType string
-		matched      bool
-	}{
+	for i, tc := range []testCase{
 		{
 			path:         "/foo.txt",
 			expectedPath: "/foo.txt",
@@ -116,44 +120,71 @@ func TestFileMatcher(t *testing.T) {
 			matched:      !isWindows,
 		},
 	} {
-		m := &MatchFile{
-			fsmap:    &filesystems.FileSystemMap{},
-			Root:     "./testdata",
-			TryFiles: []string{"{http.request.uri.path}", "{http.request.uri.path}/"},
-		}
+		fileMatcherTest(t, i, tc)
+	}
+}
 
-		u, err := url.Parse(tc.path)
-		if err != nil {
-			t.Errorf("Test %d: parsing path: %v", i, err)
-		}
+func TestFileMatcherNonWindows(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		return
+	}
 
-		req := &http.Request{URL: u}
-		repl := caddyhttp.NewTestReplacer(req)
+	// this is impossible to test on Windows, but tests a security patch for other platforms
+	tc := testCase{
+		path:         "/foodir/secr%5Cet.txt",
+		expectedPath: "/foodir/secr\\et.txt",
+		expectedType: "file",
+		matched:      true,
+	}
 
-		result, err := m.MatchWithError(req)
-		if err != nil {
-			t.Errorf("Test %d: unexpected error: %v", i, err)
-		}
-		if result != tc.matched {
-			t.Errorf("Test %d: expected match=%t, got %t", i, tc.matched, result)
-		}
+	f, err := os.Create(filepath.Join("testdata", strings.TrimPrefix(tc.expectedPath, "/")))
+	if err != nil {
+		t.Fatalf("could not create test file: %v", err)
+	}
+	defer f.Close()
+	defer os.Remove(f.Name())
 
-		rel, ok := repl.Get("http.matchers.file.relative")
-		if !ok && result {
-			t.Errorf("Test %d: expected replacer value", i)
-		}
-		if !result {
-			continue
-		}
+	fileMatcherTest(t, 0, tc)
+}
 
-		if rel != tc.expectedPath {
-			t.Errorf("Test %d: actual path: %v, expected: %v", i, rel, tc.expectedPath)
-		}
+func fileMatcherTest(t *testing.T, i int, tc testCase) {
+	m := &MatchFile{
+		fsmap:    &filesystems.FileSystemMap{},
+		Root:     "./testdata",
+		TryFiles: []string{"{http.request.uri.path}", "{http.request.uri.path}/"},
+	}
 
-		fileType, _ := repl.Get("http.matchers.file.type")
-		if fileType != tc.expectedType {
-			t.Errorf("Test %d: actual file type: %v, expected: %v", i, fileType, tc.expectedType)
-		}
+	u, err := url.Parse(tc.path)
+	if err != nil {
+		t.Errorf("Test %d: parsing path: %v", i, err)
+	}
+
+	req := &http.Request{URL: u}
+	repl := caddyhttp.NewTestReplacer(req)
+
+	result, err := m.MatchWithError(req)
+	if err != nil {
+		t.Errorf("Test %d: unexpected error: %v", i, err)
+	}
+	if result != tc.matched {
+		t.Errorf("Test %d: expected match=%t, got %t", i, tc.matched, result)
+	}
+
+	rel, ok := repl.Get("http.matchers.file.relative")
+	if !ok && result {
+		t.Errorf("Test %d: expected replacer value", i)
+	}
+	if !result {
+		return
+	}
+
+	if rel != tc.expectedPath {
+		t.Errorf("Test %d: actual path: %v, expected: %v", i, rel, tc.expectedPath)
+	}
+
+	fileType, _ := repl.Get("http.matchers.file.type")
+	if fileType != tc.expectedType {
+		t.Errorf("Test %d: actual file type: %v, expected: %v", i, fileType, tc.expectedType)
 	}
 }
 

modules/caddyhttp/fileserver/staticfiles.go

@@ -20,7 +20,7 @@ import (
 	"fmt"
 	"io"
 	"io/fs"
-	weakrand "math/rand"
+	weakrand "math/rand/v2"
 	"mime"
 	"net/http"
 	"os"
@@ -125,6 +125,11 @@ type FileServer struct {
 	// When possible, all paths are resolved to their absolute form before
 	// comparisons are made. For maximum clarity and explictness, use complete,
 	// absolute paths; or, for greater portability, use relative paths instead.
+	//
+	// Note that hide comparisons are case-sensitive. On case-insensitive
+	// filesystems, requests with different path casing may still resolve to the
+	// same file or directory on disk, so hide should not be treated as a
+	// security boundary for sensitive paths.
 	Hide []string `json:"hide,omitempty"`
 
 	// The names of files to try as index files if a folder is requested.
@@ -601,7 +606,7 @@ func (fsrv *FileServer) openFile(fileSystem fs.FS, filename string, w http.Respo
 		// maybe the server is under load and ran out of file descriptors?
 		// have client wait arbitrary seconds to help prevent a stampede
 		//nolint:gosec
-		backoff := weakrand.Intn(maxBackoff-minBackoff) + minBackoff
+		backoff := weakrand.IntN(maxBackoff-minBackoff) + minBackoff
 		w.Header().Set("Retry-After", strconv.Itoa(backoff))
 		if c := fsrv.logger.Check(zapcore.DebugLevel, "retry after backoff"); c != nil {
 			c.Write(zap.String("filename", filename), zap.Int("backoff", backoff), zap.Error(err))

modules/caddyhttp/headers/caddyfile.go

@@ -168,8 +168,6 @@ func parseReqHdrCaddyfile(h httpcaddyfile.Helper) ([]httpcaddyfile.ConfigValue,
 	}
 	h.Next() // consume the directive name again (matcher parsing resets)
 
-	configValues := []httpcaddyfile.ConfigValue{}
-
 	if !h.NextArg() {
 		return nil, h.ArgErr()
 	}
@@ -204,7 +202,7 @@ func parseReqHdrCaddyfile(h httpcaddyfile.Helper) ([]httpcaddyfile.ConfigValue,
 		return nil, h.Err(err.Error())
 	}
 
-	configValues = append(configValues, h.NewRoute(matcherSet, hdr)...)
+	configValues := h.NewRoute(matcherSet, hdr)
 
 	if h.NextArg() {
 		return nil, h.ArgErr()

modules/caddyhttp/headers/headers.go

@@ -161,11 +161,11 @@ func (ops *HeaderOps) Provision(_ caddy.Context) error {
 
 // containsPlaceholders checks if the string contains Caddy placeholder syntax {key}
 func containsPlaceholders(s string) bool {
-	openIdx := strings.Index(s, "{")
-	if openIdx == -1 {
+	_, after, ok := strings.Cut(s, "{")
+	if !ok {
 		return false
 	}
-	closeIdx := strings.Index(s[openIdx+1:], "}")
+	closeIdx := strings.Index(after, "}")
 	if closeIdx == -1 {
 		return false
 	}
@@ -217,7 +217,10 @@ type RespHeaderOps struct {
 }
 
 // ApplyTo applies ops to hdr using repl.
-func (ops HeaderOps) ApplyTo(hdr http.Header, repl *caddy.Replacer) {
+func (ops *HeaderOps) ApplyTo(hdr http.Header, repl *caddy.Replacer) {
+	if ops == nil {
+		return
+	}
 	// before manipulating headers in other ways, check if there
 	// is configuration to delete all headers, and do that first
 	// because if a header is to be added, we don't want to delete

modules/caddyhttp/intercept/intercept.go

@@ -17,6 +17,7 @@ package intercept
 import (
 	"bytes"
 	"fmt"
+	"io"
 	"net/http"
 	"strconv"
 	"strings"
@@ -175,10 +176,35 @@ func (ir Intercept) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddy
 		c.Write(zap.Int("handler", rec.handlerIndex))
 	}
 
-	// pass the request through the response handler routes
-	return rec.handler.Routes.Compile(next).ServeHTTP(w, r)
+	// response recorder doesn't create a new copy of the original headers, they're
+	// present in the original response writer
+	// create a new recorder to see if any response body from the new handler is present,
+	// if not, use the already buffered response body
+	recorder := caddyhttp.NewResponseRecorder(w, nil, nil)
+	if err := rec.handler.Routes.Compile(emptyHandler).ServeHTTP(recorder, r); err != nil {
+		return err
+	}
+
+	// no new response status and the status is not 0
+	if recorder.Status() == 0 && rec.Status() != 0 {
+		w.WriteHeader(rec.Status())
+	}
+
+	// no new response body and there is some in the original response
+	// TODO: what if the new response doesn't have a body by design?
+	// see: https://github.com/caddyserver/caddy/pull/6232#issue-2235224400
+	if recorder.Size() == 0 && buf.Len() > 0 {
+		_, err := io.Copy(w, buf)
+		return err
+	}
+	return nil
 }
 
+// this handler does nothing because everything we need is already buffered
+var emptyHandler caddyhttp.Handler = caddyhttp.HandlerFunc(func(_ http.ResponseWriter, req *http.Request) error {
+	return nil
+})
+
 // UnmarshalCaddyfile sets up the handler from Caddyfile tokens. Syntax:
 //
 //	intercept [<matcher>] {

modules/caddyhttp/logging.go

@@ -15,18 +15,28 @@
 package caddyhttp
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
+	"log/slog"
 	"net"
 	"net/http"
 	"strings"
+	"sync"
 
 	"go.uber.org/zap"
+	"go.uber.org/zap/exp/zapslog"
 	"go.uber.org/zap/zapcore"
 
 	"github.com/caddyserver/caddy/v2"
 )
 
+func init() {
+	caddy.RegisterSlogHandlerFactory(func(handler slog.Handler, core zapcore.Core, moduleID string) slog.Handler {
+		return &extraFieldsSlogHandler{defaultHandler: handler, core: core, moduleID: moduleID}
+	})
+}
+
 // ServerLogConfig describes a server's logging configuration. If
 // enabled without customization, all requests to this server are
 // logged to the default logger; logger destinations may be
@@ -223,17 +233,21 @@ func errLogValues(err error) (status int, msg string, fields func() []zapcore.Fi
 
 // ExtraLogFields is a list of extra fields to log with every request.
 type ExtraLogFields struct {
-	fields []zapcore.Field
+	fields   []zapcore.Field
+	handlers sync.Map
 }
 
 // Add adds a field to the list of extra fields to log.
 func (e *ExtraLogFields) Add(field zap.Field) {
+	e.handlers.Clear()
 	e.fields = append(e.fields, field)
 }
 
 // Set sets a field in the list of extra fields to log.
 // If the field already exists, it is replaced.
 func (e *ExtraLogFields) Set(field zap.Field) {
+	e.handlers.Clear()
+
 	for i := range e.fields {
 		if e.fields[i].Key == field.Key {
 			e.fields[i] = field
@@ -243,6 +257,29 @@ func (e *ExtraLogFields) Set(field zap.Field) {
 	e.fields = append(e.fields, field)
 }
 
+func (e *ExtraLogFields) getSloggerHandler(handler *extraFieldsSlogHandler) (h slog.Handler) {
+	if existing, ok := e.handlers.Load(handler); ok {
+		return existing.(slog.Handler)
+	}
+
+	if handler.moduleID == "" {
+		h = zapslog.NewHandler(handler.core.With(e.fields))
+	} else {
+		h = zapslog.NewHandler(handler.core.With(e.fields), zapslog.WithName(handler.moduleID))
+	}
+
+	if handler.group != "" {
+		h = h.WithGroup(handler.group)
+	}
+	if handler.attrs != nil {
+		h = h.WithAttrs(handler.attrs)
+	}
+
+	e.handlers.Store(handler, h)
+
+	return h
+}
+
 const (
 	// Variable name used to indicate that this request
 	// should be omitted from the access logs
@@ -254,3 +291,43 @@ const (
 	// Variable name used to indicate the logger to be used
 	AccessLoggerNameVarKey string = "access_logger_names"
 )
+
+type extraFieldsSlogHandler struct {
+	defaultHandler slog.Handler
+	core           zapcore.Core
+	moduleID       string
+	group          string
+	attrs          []slog.Attr
+}
+
+func (e *extraFieldsSlogHandler) Enabled(ctx context.Context, level slog.Level) bool {
+	return e.defaultHandler.Enabled(ctx, level)
+}
+
+func (e *extraFieldsSlogHandler) Handle(ctx context.Context, record slog.Record) error {
+	if elf, ok := ctx.Value(ExtraLogFieldsCtxKey).(*ExtraLogFields); ok {
+		return elf.getSloggerHandler(e).Handle(ctx, record)
+	}
+
+	return e.defaultHandler.Handle(ctx, record)
+}
+
+func (e *extraFieldsSlogHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
+	return &extraFieldsSlogHandler{
+		e.defaultHandler.WithAttrs(attrs),
+		e.core,
+		e.moduleID,
+		e.group,
+		append(e.attrs, attrs...),
+	}
+}
+
+func (e *extraFieldsSlogHandler) WithGroup(name string) slog.Handler {
+	return &extraFieldsSlogHandler{
+		e.defaultHandler.WithGroup(name),
+		e.core,
+		e.moduleID,
+		name,
+		e.attrs,
+	}
+}

modules/caddyhttp/logging/caddyfile.go

@@ -15,6 +15,8 @@
 package logging
 
 import (
+	"strings"
+
 	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
 	"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
 	"github.com/caddyserver/caddy/v2/modules/caddyhttp"
@@ -26,7 +28,7 @@ func init() {
 
 // parseCaddyfile sets up the log_append handler from Caddyfile tokens. Syntax:
 //
-//	log_append [<matcher>] <key> <value>
+//	log_append [<matcher>] [<]<key> <value>
 func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
 	handler := new(LogAppend)
 	err := handler.UnmarshalCaddyfile(h.Dispenser)
@@ -43,6 +45,10 @@ func (h *LogAppend) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 	if !d.NextArg() {
 		return d.ArgErr()
 	}
+	if strings.HasPrefix(h.Key, "<") && len(h.Key) > 1 {
+		h.Early = true
+		h.Key = h.Key[1:]
+	}
 	h.Value = d.Val()
 	return nil
 }

modules/caddyhttp/logging/logappend.go

@@ -15,6 +15,8 @@
 package logging
 
 import (
+	"bytes"
+	"encoding/base64"
 	"net/http"
 	"strings"
 
@@ -42,6 +44,12 @@ type LogAppend struct {
 	// map, the value of that key will be used. Otherwise
 	// the value will be used as-is as a constant string.
 	Value string `json:"value,omitempty"`
+
+	// Early, if true, adds the log field before calling
+	// the next handler in the chain. By default, the log
+	// field is added on the way back up the middleware chain,
+	// after all subsequent handlers have completed.
+	Early bool `json:"early,omitempty"`
 }
 
 // CaddyModule returns the Caddy module information.
@@ -53,13 +61,63 @@ func (LogAppend) CaddyModule() caddy.ModuleInfo {
 }
 
 func (h LogAppend) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
-	// Run the next handler in the chain first.
+	// Determine if we need to add the log field early.
+	// We do if the Early flag is set, or for convenience,
+	// if the value is a special placeholder for the request body.
+	needsEarly := h.Early || h.Value == placeholderRequestBody || h.Value == placeholderRequestBodyBase64
+
+	// Check if we need to buffer the response for special placeholders
+	needsResponseBody := h.Value == placeholderResponseBody || h.Value == placeholderResponseBodyBase64
+
+	if needsEarly && !needsResponseBody {
+		// Add the log field before calling the next handler
+		// (but not if we need the response body, which isn't available yet)
+		h.addLogField(r, nil)
+	}
+
+	var rec caddyhttp.ResponseRecorder
+	var buf *bytes.Buffer
+
+	if needsResponseBody {
+		// Wrap the response writer with a recorder to capture the response body
+		buf = new(bytes.Buffer)
+		rec = caddyhttp.NewResponseRecorder(w, buf, func(status int, header http.Header) bool {
+			// Always buffer the response when we need to log the body
+			return true
+		})
+		w = rec
+	}
+
+	// Run the next handler in the chain.
 	// If an error occurs, we still want to add
 	// any extra log fields that we can, so we
 	// hold onto the error and return it later.
 	handlerErr := next.ServeHTTP(w, r)
 
-	// On the way back up the chain, add the extra log field
+	if needsResponseBody {
+		// Write the buffered response to the client
+		if rec.Buffered() {
+			h.addLogField(r, buf)
+			err := rec.WriteResponse()
+			if err != nil {
+				return err
+			}
+		}
+		return handlerErr
+	}
+
+	if !h.Early {
+		// Add the log field after the handler completes
+		h.addLogField(r, buf)
+	}
+
+	return handlerErr
+}
+
+// addLogField adds the log field to the request's extra log fields.
+// If buf is not nil, it contains the buffered response body for special
+// response body placeholders.
+func (h LogAppend) addLogField(r *http.Request, buf *bytes.Buffer) {
 	ctx := r.Context()
 
 	vars := ctx.Value(caddyhttp.VarsCtxKey).(map[string]any)
@@ -67,7 +125,21 @@ func (h LogAppend) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyh
 	extra := ctx.Value(caddyhttp.ExtraLogFieldsCtxKey).(*caddyhttp.ExtraLogFields)
 
 	var varValue any
-	if strings.HasPrefix(h.Value, "{") &&
+
+	// Handle special case placeholders for response body
+	if h.Value == placeholderResponseBody {
+		if buf != nil {
+			varValue = buf.String()
+		} else {
+			varValue = ""
+		}
+	} else if h.Value == placeholderResponseBodyBase64 {
+		if buf != nil {
+			varValue = base64.StdEncoding.EncodeToString(buf.Bytes())
+		} else {
+			varValue = ""
+		}
+	} else if strings.HasPrefix(h.Value, "{") &&
 		strings.HasSuffix(h.Value, "}") &&
 		strings.Count(h.Value, "{") == 1 {
 		// the value looks like a placeholder, so get its value
@@ -84,10 +156,17 @@ func (h LogAppend) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyh
 	// We use zap.Any because it will reflect
 	// to the correct type for us.
 	extra.Add(zap.Any(h.Key, varValue))
-
-	return handlerErr
 }
 
+const (
+	// Special placeholder values that are handled by log_append
+	// rather than by the replacer.
+	placeholderRequestBody        = "{http.request.body}"
+	placeholderRequestBodyBase64  = "{http.request.body_base64}"
+	placeholderResponseBody       = "{http.response.body}"
+	placeholderResponseBodyBase64 = "{http.response.body_base64}"
+)
+
 // Interface guards
 var (
 	_ caddyhttp.MiddlewareHandler = (*LogAppend)(nil)

modules/caddyhttp/marshalers.go

@@ -110,6 +110,7 @@ func (t LoggableTLSConnState) MarshalLogObject(enc zapcore.ObjectEncoder) error
 	enc.AddUint16("cipher_suite", t.CipherSuite)
 	enc.AddString("proto", t.NegotiatedProtocol)
 	enc.AddString("server_name", t.ServerName)
+	enc.AddBool("ech", t.ECHAccepted)
 	if len(t.PeerCertificates) > 0 {
 		enc.AddString("client_common_name", t.PeerCertificates[0].Subject.CommonName)
 		enc.AddString("client_serial", t.PeerCertificates[0].SerialNumber.String())

modules/caddyhttp/matchers.go

@@ -262,13 +262,17 @@ func (m MatchHost) Provision(_ caddy.Context) error {
 		if err != nil {
 			return fmt.Errorf("converting hostname '%s' to ASCII: %v", host, err)
 		}
-		if asciiHost != host {
-			m[i] = asciiHost
-		}
 		normalizedHost := strings.ToLower(asciiHost)
 		if firstI, ok := seen[normalizedHost]; ok {
 			return fmt.Errorf("host at index %d is repeated at index %d: %s", firstI, i, host)
 		}
+		// Normalize exact hosts for standardized comparison in large-list fastpath later on.
+		// Keep wildcards/placeholders untouched.
+		if m.fuzzy(asciiHost) {
+			m[i] = asciiHost
+		} else {
+			m[i] = normalizedHost
+		}
 		seen[normalizedHost] = i
 	}
 
@@ -312,14 +316,15 @@ func (m MatchHost) MatchWithError(r *http.Request) (bool, error) {
 	}
 
 	if m.large() {
+		reqHostLower := strings.ToLower(reqHost)
 		// fast path: locate exact match using binary search (about 100-1000x faster for large lists)
 		pos := sort.Search(len(m), func(i int) bool {
 			if m.fuzzy(m[i]) {
 				return false
 			}
-			return m[i] >= reqHost
+			return m[i] >= reqHostLower
 		})
-		if pos < len(m) && m[pos] == reqHost {
+		if pos < len(m) && m[pos] == reqHostLower {
 			return true, nil
 		}
 	}
@@ -533,6 +538,7 @@ func (m MatchPath) MatchWithError(r *http.Request) (bool, error) {
 }
 
 func (MatchPath) matchPatternWithEscapeSequence(escapedPath, matchPath string) bool {
+	escapedPath = strings.ToLower(escapedPath)
 	// We would just compare the pattern against r.URL.Path,
 	// but the pattern contains %, indicating that we should
 	// compare at least some part of the path in raw/escaped
@@ -632,8 +638,8 @@ func (MatchPath) matchPatternWithEscapeSequence(escapedPath, matchPath string) b
 	// we can now treat rawpath globs (%*) as regular globs (*)
 	matchPath = strings.ReplaceAll(matchPath, "%*", "*")
 
-	// ignore error here because we can't handle it anyway=
-	matches, _ := path.Match(matchPath, sb.String())
+	// ignore error here because we can't handle it anyway
+	matches, _ := path.Match(matchPath, strings.ToLower(sb.String()))
 	return matches
 }
 

modules/caddyhttp/matchers_test.go

@@ -412,6 +412,16 @@ func TestPathMatcher(t *testing.T) {
 			input:  "/foo%2fbar/baz",
 			expect: true,
 		},
+		{
+			match:  MatchPath{"/admin%2fpanel"},
+			input:  "/ADMIN%2fpanel",
+			expect: true,
+		},
+		{
+			match:  MatchPath{"/admin%2fpa*el"},
+			input:  "/ADMIN%2fPaAzZLm123NEL",
+			expect: true,
+		},
 	} {
 		err := tc.match.Provision(caddy.Context{})
 		if err == nil && tc.provisionErr {
@@ -957,6 +967,7 @@ func TestVarREMatcher(t *testing.T) {
 		desc       string
 		match      MatchVarsRE
 		input      VarsMiddleware
+		headers    http.Header
 		expect     bool
 		expectRepl map[string]string
 	}{
@@ -991,6 +1002,14 @@ func TestVarREMatcher(t *testing.T) {
 			input:  VarsMiddleware{"Var1": "var1Value"},
 			expect: true,
 		},
+		{
+			desc:       "placeholder key value containing braces is not double-expanded",
+			match:      MatchVarsRE{"{http.request.header.X-Input}": &MatchRegexp{Pattern: ".+", Name: "val"}},
+			input:      VarsMiddleware{},
+			headers:    http.Header{"X-Input": []string{"{env.HOME}"}},
+			expect:     true,
+			expectRepl: map[string]string{"val.0": "{env.HOME}"},
+		},
 	} {
 		t.Run(tc.desc, func(t *testing.T) {
 			t.Parallel()
@@ -1007,7 +1026,7 @@ func TestVarREMatcher(t *testing.T) {
 			}
 
 			// set up the fake request and its Replacer
-			req := &http.Request{URL: new(url.URL), Method: http.MethodGet}
+			req := &http.Request{URL: new(url.URL), Method: http.MethodGet, Header: tc.headers}
 			repl := caddy.NewReplacer()
 			ctx := context.WithValue(req.Context(), caddy.ReplacerCtxKey, repl)
 			ctx = context.WithValue(ctx, VarsCtxKey, make(map[string]any))

modules/caddyhttp/metrics.go

@@ -17,14 +17,60 @@ import (
 
 // Metrics configures metrics observations.
 // EXPERIMENTAL and subject to change or removal.
+//
+// Example configuration:
+//
+//	{
+//		"apps": {
+//			"http": {
+//				"metrics": {
+//					"per_host": true,
+//					"observe_catchall_hosts": false
+//				},
+//				"servers": {
+//					"srv0": {
+//						"routes": [{
+//							"match": [{"host": ["example.com", "www.example.com"]}],
+//							"handle": [{"handler": "static_response", "body": "Hello"}]
+//						}]
+//					}
+//				}
+//			}
+//		}
+//	}
+//
+// In this configuration:
+// - Requests to example.com and www.example.com get individual host labels
+// - All other hosts (e.g., attacker.com) are aggregated under "_other" label
+// - This prevents unlimited cardinality from arbitrary Host headers
 type Metrics struct {
 	// Enable per-host metrics. Enabling this option may
 	// incur high-memory consumption, depending on the number of hosts
 	// managed by Caddy.
+	//
+	// CARDINALITY PROTECTION: To prevent unbounded cardinality attacks,
+	// only explicitly configured hosts (via host matchers) are allowed
+	// by default. Other hosts are aggregated under the "_other" label.
+	// See AllowCatchAllHosts to change this behavior.
 	PerHost bool `json:"per_host,omitempty"`
 
-	init        sync.Once
-	httpMetrics *httpMetrics `json:"-"`
+	// Allow metrics for catch-all hosts (hosts without explicit configuration).
+	// When false (default), only hosts explicitly configured via host matchers
+	// will get individual metrics labels. All other hosts will be aggregated
+	// under the "_other" label to prevent cardinality explosion.
+	//
+	// This is automatically enabled for HTTPS servers (since certificates provide
+	// some protection against unbounded cardinality), but disabled for HTTP servers
+	// by default to prevent cardinality attacks from arbitrary Host headers.
+	//
+	// Set to true to allow all hosts to get individual metrics (NOT RECOMMENDED
+	// for production environments exposed to the internet).
+	ObserveCatchallHosts bool `json:"observe_catchall_hosts,omitempty"`
+
+	init           sync.Once
+	httpMetrics    *httpMetrics
+	allowedHosts   map[string]struct{}
+	hasHTTPSServer bool
 }
 
 type httpMetrics struct {
@@ -101,6 +147,63 @@ func initHTTPMetrics(ctx caddy.Context, metrics *Metrics) {
 	}, httpLabels)
 }
 
+// scanConfigForHosts scans the HTTP app configuration to build a set of allowed hosts
+// for metrics collection, similar to how auto-HTTPS scans for domain names.
+func (m *Metrics) scanConfigForHosts(app *App) {
+	if !m.PerHost {
+		return
+	}
+
+	m.allowedHosts = make(map[string]struct{})
+	m.hasHTTPSServer = false
+
+	for _, srv := range app.Servers {
+		// Check if this server has TLS enabled
+		serverHasTLS := len(srv.TLSConnPolicies) > 0
+		if serverHasTLS {
+			m.hasHTTPSServer = true
+		}
+
+		// Collect hosts from route matchers
+		for _, route := range srv.Routes {
+			for _, matcherSet := range route.MatcherSets {
+				for _, matcher := range matcherSet {
+					if hm, ok := matcher.(*MatchHost); ok {
+						for _, host := range *hm {
+							// Only allow non-fuzzy hosts to prevent unbounded cardinality
+							if !hm.fuzzy(host) {
+								m.allowedHosts[strings.ToLower(host)] = struct{}{}
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+}
+
+// shouldAllowHostMetrics determines if metrics should be collected for the given host.
+// This implements the cardinality protection by only allowing metrics for:
+// 1. Explicitly configured hosts
+// 2. Catch-all requests on HTTPS servers (if AllowCatchAllHosts is true or auto-enabled)
+// 3. Catch-all requests on HTTP servers only if explicitly allowed
+func (m *Metrics) shouldAllowHostMetrics(host string, isHTTPS bool) bool {
+	if !m.PerHost {
+		return true // host won't be used in labels anyway
+	}
+
+	normalizedHost := strings.ToLower(host)
+
+	// Always allow explicitly configured hosts
+	if _, exists := m.allowedHosts[normalizedHost]; exists {
+		return true
+	}
+
+	// For catch-all requests (not in allowed hosts)
+	allowCatchAll := m.ObserveCatchallHosts || (isHTTPS && m.hasHTTPSServer)
+	return allowCatchAll
+}
+
 // serverNameFromContext extracts the current server name from the context.
 // Returns "UNKNOWN" if none is available (should probably never happen).
 func serverNameFromContext(ctx context.Context) string {
@@ -111,21 +214,24 @@ func serverNameFromContext(ctx context.Context) string {
 	return srv.name
 }
 
-type metricsInstrumentedHandler struct {
+// metricsInstrumentedRoute wraps a compiled route Handler with metrics
+// instrumentation. It wraps the entire compiled route chain once,
+// collecting metrics only once per route match.
+type metricsInstrumentedRoute struct {
 	handler string
-	mh      MiddlewareHandler
+	next    Handler
 	metrics *Metrics
 }
 
-func newMetricsInstrumentedHandler(ctx caddy.Context, handler string, mh MiddlewareHandler, metrics *Metrics) *metricsInstrumentedHandler {
-	metrics.init.Do(func() {
-		initHTTPMetrics(ctx, metrics)
+func newMetricsInstrumentedRoute(ctx caddy.Context, handler string, next Handler, m *Metrics) *metricsInstrumentedRoute {
+	m.init.Do(func() {
+		initHTTPMetrics(ctx, m)
 	})
 
-	return &metricsInstrumentedHandler{handler, mh, metrics}
+	return &metricsInstrumentedRoute{handler: handler, next: next, metrics: m}
 }
 
-func (h *metricsInstrumentedHandler) ServeHTTP(w http.ResponseWriter, r *http.Request, next Handler) error {
+func (h *metricsInstrumentedRoute) ServeHTTP(w http.ResponseWriter, r *http.Request) error {
 	server := serverNameFromContext(r.Context())
 	labels := prometheus.Labels{"server": server, "handler": h.handler}
 	method := metrics.SanitizeMethod(r.Method)
@@ -133,9 +239,19 @@ func (h *metricsInstrumentedHandler) ServeHTTP(w http.ResponseWriter, r *http.Re
 	// of a panic
 	statusLabels := prometheus.Labels{"server": server, "handler": h.handler, "method": method, "code": ""}
 
+	// Determine if this is an HTTPS request
+	isHTTPS := r.TLS != nil
+
 	if h.metrics.PerHost {
-		labels["host"] = strings.ToLower(r.Host)
-		statusLabels["host"] = strings.ToLower(r.Host)
+		// Apply cardinality protection for host metrics
+		if h.metrics.shouldAllowHostMetrics(r.Host, isHTTPS) {
+			labels["host"] = strings.ToLower(r.Host)
+			statusLabels["host"] = strings.ToLower(r.Host)
+		} else {
+			// Use a catch-all label for unallowed hosts to prevent cardinality explosion
+			labels["host"] = "_other"
+			statusLabels["host"] = "_other"
+		}
 	}
 
 	inFlight := h.metrics.httpMetrics.requestInFlight.With(labels)
@@ -154,7 +270,7 @@ func (h *metricsInstrumentedHandler) ServeHTTP(w http.ResponseWriter, r *http.Re
 		return false
 	})
 	wrec := NewResponseRecorder(w, nil, writeHeaderRecorder)
-	err := h.mh.ServeHTTP(wrec, r, next)
+	err := h.next.ServeHTTP(wrec, r)
 	dur := time.Since(start).Seconds()
 	h.metrics.httpMetrics.requestCount.With(labels).Inc()
 

modules/caddyhttp/metrics_test.go

@@ -2,6 +2,7 @@ package caddyhttp
 
 import (
 	"context"
+	"crypto/tls"
 	"errors"
 	"net/http"
 	"net/http/httptest"
@@ -46,16 +47,12 @@ func TestMetricsInstrumentedHandler(t *testing.T) {
 		return handlerErr
 	})
 
-	mh := middlewareHandlerFunc(func(w http.ResponseWriter, r *http.Request, h Handler) error {
-		return h.ServeHTTP(w, r)
-	})
-
-	ih := newMetricsInstrumentedHandler(ctx, "bar", mh, metrics)
+	ih := newMetricsInstrumentedRoute(ctx, "bar", h, metrics)
 
 	r := httptest.NewRequest("GET", "/", nil)
 	w := httptest.NewRecorder()
 
-	if actual := ih.ServeHTTP(w, r, h); actual != handlerErr {
+	if actual := ih.ServeHTTP(w, r); actual != handlerErr {
 		t.Errorf("Not same: expected %#v, but got %#v", handlerErr, actual)
 	}
 	if actual := testutil.ToFloat64(metrics.httpMetrics.requestInFlight); actual != 0.0 {
@@ -63,19 +60,19 @@ func TestMetricsInstrumentedHandler(t *testing.T) {
 	}
 
 	handlerErr = nil
-	if err := ih.ServeHTTP(w, r, h); err != nil {
+	if err := ih.ServeHTTP(w, r); err != nil {
 		t.Errorf("Received unexpected error: %v", err)
 	}
 
 	// an empty handler - no errors, no header written
-	mh = middlewareHandlerFunc(func(w http.ResponseWriter, r *http.Request, h Handler) error {
+	emptyHandler := HandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
 		return nil
 	})
-	ih = newMetricsInstrumentedHandler(ctx, "empty", mh, metrics)
+	ih = newMetricsInstrumentedRoute(ctx, "empty", emptyHandler, metrics)
 	r = httptest.NewRequest("GET", "/", nil)
 	w = httptest.NewRecorder()
 
-	if err := ih.ServeHTTP(w, r, h); err != nil {
+	if err := ih.ServeHTTP(w, r); err != nil {
 		t.Errorf("Received unexpected error: %v", err)
 	}
 	if actual := w.Result().StatusCode; actual != 200 {
@@ -86,16 +83,16 @@ func TestMetricsInstrumentedHandler(t *testing.T) {
 	}
 
 	// handler returning an error with an HTTP status
-	mh = middlewareHandlerFunc(func(w http.ResponseWriter, r *http.Request, h Handler) error {
+	errHandler := HandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
 		return Error(http.StatusTooManyRequests, nil)
 	})
 
-	ih = newMetricsInstrumentedHandler(ctx, "foo", mh, metrics)
+	ih = newMetricsInstrumentedRoute(ctx, "foo", errHandler, metrics)
 
 	r = httptest.NewRequest("GET", "/", nil)
 	w = httptest.NewRecorder()
 
-	if err := ih.ServeHTTP(w, r, nil); err == nil {
+	if err := ih.ServeHTTP(w, r); err == nil {
 		t.Errorf("expected error to be propagated")
 	}
 
@@ -206,9 +203,11 @@ func TestMetricsInstrumentedHandler(t *testing.T) {
 func TestMetricsInstrumentedHandlerPerHost(t *testing.T) {
 	ctx, _ := caddy.NewContext(caddy.Context{Context: context.Background()})
 	metrics := &Metrics{
-		PerHost:     true,
-		init:        sync.Once{},
-		httpMetrics: &httpMetrics{},
+		PerHost:              true,
+		ObserveCatchallHosts: true, // Allow all hosts for testing
+		init:                 sync.Once{},
+		httpMetrics:          &httpMetrics{},
+		allowedHosts:         make(map[string]struct{}),
 	}
 	handlerErr := errors.New("oh noes")
 	response := []byte("hello world!")
@@ -222,16 +221,12 @@ func TestMetricsInstrumentedHandlerPerHost(t *testing.T) {
 		return handlerErr
 	})
 
-	mh := middlewareHandlerFunc(func(w http.ResponseWriter, r *http.Request, h Handler) error {
-		return h.ServeHTTP(w, r)
-	})
-
-	ih := newMetricsInstrumentedHandler(ctx, "bar", mh, metrics)
+	ih := newMetricsInstrumentedRoute(ctx, "bar", h, metrics)
 
 	r := httptest.NewRequest("GET", "/", nil)
 	w := httptest.NewRecorder()
 
-	if actual := ih.ServeHTTP(w, r, h); actual != handlerErr {
+	if actual := ih.ServeHTTP(w, r); actual != handlerErr {
 		t.Errorf("Not same: expected %#v, but got %#v", handlerErr, actual)
 	}
 	if actual := testutil.ToFloat64(metrics.httpMetrics.requestInFlight); actual != 0.0 {
@@ -239,19 +234,19 @@ func TestMetricsInstrumentedHandlerPerHost(t *testing.T) {
 	}
 
 	handlerErr = nil
-	if err := ih.ServeHTTP(w, r, h); err != nil {
+	if err := ih.ServeHTTP(w, r); err != nil {
 		t.Errorf("Received unexpected error: %v", err)
 	}
 
 	// an empty handler - no errors, no header written
-	mh = middlewareHandlerFunc(func(w http.ResponseWriter, r *http.Request, h Handler) error {
+	emptyHandler := HandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
 		return nil
 	})
-	ih = newMetricsInstrumentedHandler(ctx, "empty", mh, metrics)
+	ih = newMetricsInstrumentedRoute(ctx, "empty", emptyHandler, metrics)
 	r = httptest.NewRequest("GET", "/", nil)
 	w = httptest.NewRecorder()
 
-	if err := ih.ServeHTTP(w, r, h); err != nil {
+	if err := ih.ServeHTTP(w, r); err != nil {
 		t.Errorf("Received unexpected error: %v", err)
 	}
 	if actual := w.Result().StatusCode; actual != 200 {
@@ -262,16 +257,16 @@ func TestMetricsInstrumentedHandlerPerHost(t *testing.T) {
 	}
 
 	// handler returning an error with an HTTP status
-	mh = middlewareHandlerFunc(func(w http.ResponseWriter, r *http.Request, h Handler) error {
+	errHandler := HandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
 		return Error(http.StatusTooManyRequests, nil)
 	})
 
-	ih = newMetricsInstrumentedHandler(ctx, "foo", mh, metrics)
+	ih = newMetricsInstrumentedRoute(ctx, "foo", errHandler, metrics)
 
 	r = httptest.NewRequest("GET", "/", nil)
 	w = httptest.NewRecorder()
 
-	if err := ih.ServeHTTP(w, r, nil); err == nil {
+	if err := ih.ServeHTTP(w, r); err == nil {
 		t.Errorf("expected error to be propagated")
 	}
 
@@ -379,8 +374,208 @@ func TestMetricsInstrumentedHandlerPerHost(t *testing.T) {
 	}
 }
 
-type middlewareHandlerFunc func(http.ResponseWriter, *http.Request, Handler) error
+func TestMetricsCardinalityProtection(t *testing.T) {
+	ctx, _ := caddy.NewContext(caddy.Context{Context: context.Background()})
 
-func (f middlewareHandlerFunc) ServeHTTP(w http.ResponseWriter, r *http.Request, h Handler) error {
-	return f(w, r, h)
+	// Test 1: Without AllowCatchAllHosts, arbitrary hosts should be mapped to "_other"
+	metrics := &Metrics{
+		PerHost:              true,
+		ObserveCatchallHosts: false, // Default - should map unknown hosts to "_other"
+		init:                 sync.Once{},
+		httpMetrics:          &httpMetrics{},
+		allowedHosts:         make(map[string]struct{}),
+	}
+
+	// Add one allowed host
+	metrics.allowedHosts["allowed.com"] = struct{}{}
+
+	h := HandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
+		w.Write([]byte("hello"))
+		return nil
+	})
+
+	ih := newMetricsInstrumentedRoute(ctx, "test", h, metrics)
+
+	// Test request to allowed host
+	r1 := httptest.NewRequest("GET", "http://allowed.com/", nil)
+	r1.Host = "allowed.com"
+	w1 := httptest.NewRecorder()
+	ih.ServeHTTP(w1, r1)
+
+	// Test request to unknown host (should be mapped to "_other")
+	r2 := httptest.NewRequest("GET", "http://attacker.com/", nil)
+	r2.Host = "attacker.com"
+	w2 := httptest.NewRecorder()
+	ih.ServeHTTP(w2, r2)
+
+	// Test request to another unknown host (should also be mapped to "_other")
+	r3 := httptest.NewRequest("GET", "http://evil.com/", nil)
+	r3.Host = "evil.com"
+	w3 := httptest.NewRecorder()
+	ih.ServeHTTP(w3, r3)
+
+	// Check that metrics contain:
+	// - One entry for "allowed.com"
+	// - One entry for "_other" (aggregating attacker.com and evil.com)
+	expected := `
+	# HELP caddy_http_requests_total Counter of HTTP(S) requests made.
+	# TYPE caddy_http_requests_total counter
+	caddy_http_requests_total{handler="test",host="_other",server="UNKNOWN"} 2
+	caddy_http_requests_total{handler="test",host="allowed.com",server="UNKNOWN"} 1
+	`
+
+	if err := testutil.GatherAndCompare(ctx.GetMetricsRegistry(), strings.NewReader(expected),
+		"caddy_http_requests_total",
+	); err != nil {
+		t.Errorf("Cardinality protection test failed: %s", err)
+	}
+}
+
+func TestMetricsHTTPSCatchAll(t *testing.T) {
+	ctx, _ := caddy.NewContext(caddy.Context{Context: context.Background()})
+
+	// Test that HTTPS requests allow catch-all even when AllowCatchAllHosts is false
+	metrics := &Metrics{
+		PerHost:              true,
+		ObserveCatchallHosts: false,
+		hasHTTPSServer:       true, // Simulate having HTTPS servers
+		init:                 sync.Once{},
+		httpMetrics:          &httpMetrics{},
+		allowedHosts:         make(map[string]struct{}), // Empty - no explicitly allowed hosts
+	}
+
+	h := HandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
+		w.Write([]byte("hello"))
+		return nil
+	})
+
+	ih := newMetricsInstrumentedRoute(ctx, "test", h, metrics)
+
+	// Test HTTPS request (should be allowed even though not in allowedHosts)
+	r1 := httptest.NewRequest("GET", "https://unknown.com/", nil)
+	r1.Host = "unknown.com"
+	r1.TLS = &tls.ConnectionState{} // Mark as TLS/HTTPS
+	w1 := httptest.NewRecorder()
+	ih.ServeHTTP(w1, r1)
+
+	// Test HTTP request (should be mapped to "_other")
+	r2 := httptest.NewRequest("GET", "http://unknown.com/", nil)
+	r2.Host = "unknown.com"
+	// No TLS field = HTTP request
+	w2 := httptest.NewRecorder()
+	ih.ServeHTTP(w2, r2)
+
+	// Check that HTTPS request gets real host, HTTP gets "_other"
+	expected := `
+	# HELP caddy_http_requests_total Counter of HTTP(S) requests made.
+	# TYPE caddy_http_requests_total counter
+	caddy_http_requests_total{handler="test",host="_other",server="UNKNOWN"} 1
+	caddy_http_requests_total{handler="test",host="unknown.com",server="UNKNOWN"} 1
+	`
+
+	if err := testutil.GatherAndCompare(ctx.GetMetricsRegistry(), strings.NewReader(expected),
+		"caddy_http_requests_total",
+	); err != nil {
+		t.Errorf("HTTPS catch-all test failed: %s", err)
+	}
+}
+
+func TestMetricsInstrumentedRoute(t *testing.T) {
+	ctx, _ := caddy.NewContext(caddy.Context{Context: context.Background()})
+	m := &Metrics{
+		init:        sync.Once{},
+		httpMetrics: &httpMetrics{},
+	}
+
+	handlerErr := errors.New("oh noes")
+	response := []byte("hello world!")
+	innerHandler := HandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
+		if actual := testutil.ToFloat64(m.httpMetrics.requestInFlight); actual != 1.0 {
+			t.Errorf("Expected requestInFlight to be 1.0, got %v", actual)
+		}
+		if handlerErr == nil {
+			w.Write(response)
+		}
+		return handlerErr
+	})
+
+	ih := newMetricsInstrumentedRoute(ctx, "test_handler", innerHandler, m)
+
+	r := httptest.NewRequest("GET", "/", nil)
+	w := httptest.NewRecorder()
+
+	// Test with error
+	if actual := ih.ServeHTTP(w, r); actual != handlerErr {
+		t.Errorf("Expected error %v, got %v", handlerErr, actual)
+	}
+	if actual := testutil.ToFloat64(m.httpMetrics.requestInFlight); actual != 0.0 {
+		t.Errorf("Expected requestInFlight to be 0.0 after request, got %v", actual)
+	}
+	if actual := testutil.ToFloat64(m.httpMetrics.requestErrors); actual != 1.0 {
+		t.Errorf("Expected requestErrors to be 1.0, got %v", actual)
+	}
+
+	// Test without error
+	handlerErr = nil
+	w = httptest.NewRecorder()
+	if err := ih.ServeHTTP(w, r); err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+}
+
+func BenchmarkMetricsInstrumentedRoute(b *testing.B) {
+	ctx, _ := caddy.NewContext(caddy.Context{Context: context.Background()})
+	m := &Metrics{
+		init:        sync.Once{},
+		httpMetrics: &httpMetrics{},
+	}
+
+	noopHandler := HandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
+		w.Write([]byte("ok"))
+		return nil
+	})
+
+	ih := newMetricsInstrumentedRoute(ctx, "bench_handler", noopHandler, m)
+
+	r := httptest.NewRequest("GET", "/", nil)
+	w := httptest.NewRecorder()
+
+	b.ResetTimer()
+	b.ReportAllocs()
+	for i := 0; i < b.N; i++ {
+		ih.ServeHTTP(w, r)
+	}
+}
+
+// BenchmarkSingleRouteMetrics simulates the new behavior where metrics
+// are collected once for the entire route.
+func BenchmarkSingleRouteMetrics(b *testing.B) {
+	ctx, _ := caddy.NewContext(caddy.Context{Context: context.Background()})
+	m := &Metrics{
+		init:        sync.Once{},
+		httpMetrics: &httpMetrics{},
+	}
+
+	// Build a chain of 5 plain middleware handlers (no per-handler metrics)
+	var next Handler = HandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
+		return nil
+	})
+	for i := 0; i < 5; i++ {
+		capturedNext := next
+		next = HandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
+			return capturedNext.ServeHTTP(w, r)
+		})
+	}
+
+	// Wrap the entire chain with a single route-level metrics handler
+	ih := newMetricsInstrumentedRoute(ctx, "handler", next, m)
+
+	r := httptest.NewRequest("GET", "/", nil)
+	w := httptest.NewRecorder()
+
+	b.ResetTimer()
+	b.ReportAllocs()
+	for i := 0; i < b.N; i++ {
+		ih.ServeHTTP(w, r)
+	}
 }

modules/caddyhttp/push/caddyfile.go

@@ -64,6 +64,7 @@ func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error)
 				var err error
 
 				// include current token, which we treat as an argument here
+				// nolint:prealloc
 				args := []string{h.Val()}
 				args = append(args, h.RemainingArgs()...)
 

modules/caddyhttp/replacer.go

@@ -229,6 +229,21 @@ func addHTTPVarsToReplacer(repl *caddy.Replacer, req *http.Request, w http.Respo
 				req.Body = io.NopCloser(buf)  // replace real body with buffered data
 				return buf.String(), true
 
+			case "http.request.body_base64":
+				if req.Body == nil {
+					return "", true
+				}
+				// normally net/http will close the body for us, but since we
+				// are replacing it with a fake one, we have to ensure we close
+				// the real body ourselves when we're done
+				defer req.Body.Close()
+				// read the request body into a buffer (can't pool because we
+				// don't know its lifetime and would have to make a copy anyway)
+				buf := new(bytes.Buffer)
+				_, _ = io.Copy(buf, req.Body) // can't handle error, so just ignore it
+				req.Body = io.NopCloser(buf)  // replace real body with buffered data
+				return base64.StdEncoding.EncodeToString(buf.Bytes()), true
+
 			// original request, before any internal changes
 			case "http.request.orig_method":
 				or, _ := req.Context().Value(OriginalRequestCtxKey).(http.Request)
@@ -405,7 +420,16 @@ func getReqTLSReplacement(req *http.Request, key string) (any, bool) {
 	if strings.HasPrefix(field, "client.") {
 		cert := getTLSPeerCert(req.TLS)
 		if cert == nil {
-			return nil, false
+			// Instead of returning (nil, false) here, we set it to a dummy
+			// value to fix #7530. This way, even if there is no client cert,
+			// evaluating placeholders with ReplaceKnown() will still remove
+			// the placeholder, which would be expected. It is not expected
+			// for the placeholder to sometimes get removed based on whether
+			// the client presented a cert. We also do not return true here
+			// because we probably should remain accurate about whether a
+			// placeholder is, in fact, known or not.
+			// (This allocation may be slightly inefficient.)
+			cert = new(x509.Certificate)
 		}
 
 		// subject alternate names (SANs)
@@ -511,6 +535,8 @@ func getReqTLSReplacement(req *http.Request, key string) (any, bool) {
 		return true, true
 	case "server_name":
 		return req.TLS.ServerName, true
+	case "ech":
+		return req.TLS.ECHAccepted, true
 	}
 	return nil, false
 }

modules/caddyhttp/reverseproxy/admin.go

@@ -73,8 +73,9 @@ func (adminUpstreams) handleUpstreams(w http.ResponseWriter, r *http.Request) er
 
 	// Collect the results to respond with
 	results := []upstreamStatus{}
+	knownHosts := make(map[string]struct{})
 
-	// Iterate over the upstream pool (needs to be fast)
+	// Iterate over the static upstream pool (needs to be fast)
 	var rangeErr error
 	hosts.Range(func(key, val any) bool {
 		address, ok := key.(string)
@@ -95,6 +96,8 @@ func (adminUpstreams) handleUpstreams(w http.ResponseWriter, r *http.Request) er
 			return false
 		}
 
+		knownHosts[address] = struct{}{}
+
 		results = append(results, upstreamStatus{
 			Address:     address,
 			NumRequests: upstream.NumRequests(),
@@ -103,11 +106,32 @@ func (adminUpstreams) handleUpstreams(w http.ResponseWriter, r *http.Request) er
 		return true
 	})
 
-	// If an error happened during the range, return it
+	currentInFlight := getInFlightRequests()
+	for address, count := range currentInFlight {
+		if _, exists := knownHosts[address]; !exists && count > 0 {
+			results = append(results, upstreamStatus{
+				Address:     address,
+				NumRequests: int(count),
+				Fails:       0,
+			})
+		}
+	}
+
 	if rangeErr != nil {
 		return rangeErr
 	}
 
+	// Also include dynamic upstreams
+	dynamicHostsMu.RLock()
+	for address, entry := range dynamicHosts {
+		results = append(results, upstreamStatus{
+			Address:     address,
+			NumRequests: entry.host.NumRequests(),
+			Fails:       entry.host.Fails(),
+		})
+	}
+	dynamicHostsMu.RUnlock()
+
 	err := enc.Encode(results)
 	if err != nil {
 		return caddy.APIError{

modules/caddyhttp/reverseproxy/admin_test.go

@@ -0,0 +1,275 @@
+// Copyright 2015 Matthew Holt and The Caddy Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package reverseproxy
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+)
+
+// adminHandlerFixture sets up the global host state for an admin endpoint test
+// and returns a cleanup function that must be deferred by the caller.
+//
+// staticAddrs are inserted into the UsagePool (as a static upstream would be).
+// dynamicAddrs are inserted into the dynamicHosts map (as a dynamic upstream would be).
+func adminHandlerFixture(t *testing.T, staticAddrs, dynamicAddrs []string) func() {
+	t.Helper()
+
+	for _, addr := range staticAddrs {
+		u := &Upstream{Dial: addr}
+		u.fillHost()
+	}
+
+	dynamicHostsMu.Lock()
+	for _, addr := range dynamicAddrs {
+		dynamicHosts[addr] = dynamicHostEntry{host: new(Host), lastSeen: time.Now()}
+	}
+	dynamicHostsMu.Unlock()
+
+	return func() {
+		// Remove static entries from the UsagePool.
+		for _, addr := range staticAddrs {
+			_, _ = hosts.Delete(addr)
+		}
+		// Remove dynamic entries.
+		dynamicHostsMu.Lock()
+		for _, addr := range dynamicAddrs {
+			delete(dynamicHosts, addr)
+		}
+		dynamicHostsMu.Unlock()
+	}
+}
+
+// callAdminUpstreams fires a GET against handleUpstreams and returns the
+// decoded response body.
+func callAdminUpstreams(t *testing.T) []upstreamStatus {
+	t.Helper()
+	req := httptest.NewRequest(http.MethodGet, "/reverse_proxy/upstreams", nil)
+	w := httptest.NewRecorder()
+
+	handler := adminUpstreams{}
+	if err := handler.handleUpstreams(w, req); err != nil {
+		t.Fatalf("handleUpstreams returned unexpected error: %v", err)
+	}
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d", w.Code)
+	}
+	if ct := w.Header().Get("Content-Type"); ct != "application/json" {
+		t.Fatalf("expected Content-Type application/json, got %q", ct)
+	}
+
+	var results []upstreamStatus
+	if err := json.NewDecoder(w.Body).Decode(&results); err != nil {
+		t.Fatalf("failed to decode response: %v", err)
+	}
+	return results
+}
+
+// resultsByAddress indexes a slice of upstreamStatus by address for easier
+// lookup in assertions.
+func resultsByAddress(statuses []upstreamStatus) map[string]upstreamStatus {
+	m := make(map[string]upstreamStatus, len(statuses))
+	for _, s := range statuses {
+		m[s.Address] = s
+	}
+	return m
+}
+
+// TestAdminUpstreamsMethodNotAllowed verifies that non-GET methods are rejected.
+func TestAdminUpstreamsMethodNotAllowed(t *testing.T) {
+	for _, method := range []string{http.MethodPost, http.MethodPut, http.MethodDelete} {
+		req := httptest.NewRequest(method, "/reverse_proxy/upstreams", nil)
+		w := httptest.NewRecorder()
+		err := (adminUpstreams{}).handleUpstreams(w, req)
+		if err == nil {
+			t.Errorf("method %s: expected an error, got nil", method)
+			continue
+		}
+		apiErr, ok := err.(interface{ HTTPStatus() int })
+		if !ok {
+			// caddy.APIError stores the code in HTTPStatus field, access via the
+			// exported interface it satisfies indirectly; just check non-nil.
+			continue
+		}
+		if code := apiErr.HTTPStatus(); code != http.StatusMethodNotAllowed {
+			t.Errorf("method %s: expected 405, got %d", method, code)
+		}
+	}
+}
+
+// TestAdminUpstreamsEmpty verifies that an empty response is valid JSON when
+// no upstreams are registered.
+func TestAdminUpstreamsEmpty(t *testing.T) {
+	resetDynamicHosts()
+
+	results := callAdminUpstreams(t)
+	if results == nil {
+		t.Error("expected non-nil (empty) slice, got nil")
+	}
+	if len(results) != 0 {
+		t.Errorf("expected 0 results with empty pools, got %d", len(results))
+	}
+}
+
+// TestAdminUpstreamsStaticOnly verifies that static upstreams (from the
+// UsagePool) appear in the response with correct addresses.
+func TestAdminUpstreamsStaticOnly(t *testing.T) {
+	resetDynamicHosts()
+	cleanup := adminHandlerFixture(t,
+		[]string{"10.0.0.1:80", "10.0.0.2:80"},
+		nil,
+	)
+	defer cleanup()
+
+	results := callAdminUpstreams(t)
+	byAddr := resultsByAddress(results)
+
+	for _, addr := range []string{"10.0.0.1:80", "10.0.0.2:80"} {
+		if _, ok := byAddr[addr]; !ok {
+			t.Errorf("expected static upstream %q in response", addr)
+		}
+	}
+	if len(results) != 2 {
+		t.Errorf("expected exactly 2 results, got %d", len(results))
+	}
+}
+
+// TestAdminUpstreamsDynamicOnly verifies that dynamic upstreams (from
+// dynamicHosts) appear in the response with correct addresses.
+func TestAdminUpstreamsDynamicOnly(t *testing.T) {
+	resetDynamicHosts()
+	cleanup := adminHandlerFixture(t,
+		nil,
+		[]string{"10.0.1.1:80", "10.0.1.2:80"},
+	)
+	defer cleanup()
+
+	results := callAdminUpstreams(t)
+	byAddr := resultsByAddress(results)
+
+	for _, addr := range []string{"10.0.1.1:80", "10.0.1.2:80"} {
+		if _, ok := byAddr[addr]; !ok {
+			t.Errorf("expected dynamic upstream %q in response", addr)
+		}
+	}
+	if len(results) != 2 {
+		t.Errorf("expected exactly 2 results, got %d", len(results))
+	}
+}
+
+// TestAdminUpstreamsBothPools verifies that static and dynamic upstreams are
+// both present in the same response and that there is no overlap or omission.
+func TestAdminUpstreamsBothPools(t *testing.T) {
+	resetDynamicHosts()
+	cleanup := adminHandlerFixture(t,
+		[]string{"10.0.2.1:80"},
+		[]string{"10.0.2.2:80"},
+	)
+	defer cleanup()
+
+	results := callAdminUpstreams(t)
+	if len(results) != 2 {
+		t.Fatalf("expected 2 results (1 static + 1 dynamic), got %d", len(results))
+	}
+
+	byAddr := resultsByAddress(results)
+	if _, ok := byAddr["10.0.2.1:80"]; !ok {
+		t.Error("static upstream missing from response")
+	}
+	if _, ok := byAddr["10.0.2.2:80"]; !ok {
+		t.Error("dynamic upstream missing from response")
+	}
+}
+
+// TestAdminUpstreamsNoOverlapBetweenPools verifies that an address registered
+// only as a static upstream does not also appear as a dynamic entry, and
+// vice-versa.
+func TestAdminUpstreamsNoOverlapBetweenPools(t *testing.T) {
+	resetDynamicHosts()
+	cleanup := adminHandlerFixture(t,
+		[]string{"10.0.3.1:80"},
+		[]string{"10.0.3.2:80"},
+	)
+	defer cleanup()
+
+	results := callAdminUpstreams(t)
+	seen := make(map[string]int)
+	for _, r := range results {
+		seen[r.Address]++
+	}
+	for addr, count := range seen {
+		if count > 1 {
+			t.Errorf("address %q appeared %d times; expected exactly once", addr, count)
+		}
+	}
+}
+
+// TestAdminUpstreamsReportsFailCounts verifies that fail counts accumulated on
+// a dynamic upstream's Host are reflected in the response.
+func TestAdminUpstreamsReportsFailCounts(t *testing.T) {
+	resetDynamicHosts()
+
+	const addr = "10.0.4.1:80"
+	h := new(Host)
+	_ = h.countFail(3)
+
+	dynamicHostsMu.Lock()
+	dynamicHosts[addr] = dynamicHostEntry{host: h, lastSeen: time.Now()}
+	dynamicHostsMu.Unlock()
+	defer func() {
+		dynamicHostsMu.Lock()
+		delete(dynamicHosts, addr)
+		dynamicHostsMu.Unlock()
+	}()
+
+	results := callAdminUpstreams(t)
+	byAddr := resultsByAddress(results)
+
+	status, ok := byAddr[addr]
+	if !ok {
+		t.Fatalf("expected %q in response", addr)
+	}
+	if status.Fails != 3 {
+		t.Errorf("expected Fails=3, got %d", status.Fails)
+	}
+}
+
+// TestAdminUpstreamsReportsNumRequests verifies that the active request count
+// for a static upstream is reflected in the response.
+func TestAdminUpstreamsReportsNumRequests(t *testing.T) {
+	resetDynamicHosts()
+
+	const addr = "10.0.4.2:80"
+	u := &Upstream{Dial: addr}
+	u.fillHost()
+	defer func() { _, _ = hosts.Delete(addr) }()
+
+	_ = u.Host.countRequest(2)
+	defer func() { _ = u.Host.countRequest(-2) }()
+
+	results := callAdminUpstreams(t)
+	byAddr := resultsByAddress(results)
+
+	status, ok := byAddr[addr]
+	if !ok {
+		t.Fatalf("expected %q in response", addr)
+	}
+	if status.NumRequests != 2 {
+		t.Errorf("expected NumRequests=2, got %d", status.NumRequests)
+	}
+}

modules/caddyhttp/reverseproxy/caddyfile.go

@@ -888,8 +888,11 @@ func (h *Handler) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 			if commonScheme == "http" && te.TLSEnabled() {
 				return d.Errf("upstream address scheme is HTTP but transport is configured for HTTP+TLS (HTTPS)")
 			}
-			if te, ok := transport.(*HTTPTransport); ok && commonScheme == "h2c" {
-				te.Versions = []string{"h2c", "2"}
+			if h2ct, ok := transport.(H2CTransport); ok && commonScheme == "h2c" {
+				err := h2ct.EnableH2C()
+				if err != nil {
+					return err
+				}
 			}
 		} else if commonScheme == "https" {
 			return d.Errf("upstreams are configured for HTTPS but transport module does not support TLS: %T", transport)
@@ -1525,6 +1528,7 @@ func (u *SRVUpstreams) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 				return d.Errf("bad delay value '%s': %v", d.Val(), err)
 			}
 			u.FallbackDelay = caddy.Duration(dur)
+
 		case "grace_period":
 			if !d.NextArg() {
 				return d.ArgErr()

modules/caddyhttp/reverseproxy/dynamic_upstreams_test.go

@@ -0,0 +1,345 @@
+// Copyright 2015 Matthew Holt and The Caddy Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package reverseproxy
+
+import (
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/caddyserver/caddy/v2"
+)
+
+// resetDynamicHosts clears global dynamic host state between tests.
+func resetDynamicHosts() {
+	dynamicHostsMu.Lock()
+	dynamicHosts = make(map[string]dynamicHostEntry)
+	dynamicHostsMu.Unlock()
+	// Reset the Once so cleanup goroutine tests can re-trigger if needed.
+	dynamicHostsCleanerOnce = sync.Once{}
+}
+
+// TestFillDynamicHostCreatesEntry verifies that calling fillDynamicHost on a
+// new address inserts an entry into dynamicHosts and assigns a non-nil Host.
+func TestFillDynamicHostCreatesEntry(t *testing.T) {
+	resetDynamicHosts()
+
+	u := &Upstream{Dial: "192.0.2.1:80"}
+	u.fillDynamicHost()
+
+	if u.Host == nil {
+		t.Fatal("expected Host to be set after fillDynamicHost")
+	}
+
+	dynamicHostsMu.RLock()
+	entry, ok := dynamicHosts["192.0.2.1:80"]
+	dynamicHostsMu.RUnlock()
+
+	if !ok {
+		t.Fatal("expected entry in dynamicHosts map")
+	}
+	if entry.host != u.Host {
+		t.Error("dynamicHosts entry host should be the same pointer assigned to Upstream.Host")
+	}
+	if entry.lastSeen.IsZero() {
+		t.Error("expected lastSeen to be set")
+	}
+}
+
+// TestFillDynamicHostReusesSameHost verifies that two calls for the same address
+// return the exact same *Host pointer so that state (e.g. fail counts) is shared.
+func TestFillDynamicHostReusesSameHost(t *testing.T) {
+	resetDynamicHosts()
+
+	u1 := &Upstream{Dial: "192.0.2.2:80"}
+	u1.fillDynamicHost()
+
+	u2 := &Upstream{Dial: "192.0.2.2:80"}
+	u2.fillDynamicHost()
+
+	if u1.Host != u2.Host {
+		t.Error("expected both upstreams to share the same *Host pointer")
+	}
+}
+
+// TestFillDynamicHostUpdatesLastSeen verifies that a second call for the same
+// address advances the lastSeen timestamp.
+func TestFillDynamicHostUpdatesLastSeen(t *testing.T) {
+	resetDynamicHosts()
+
+	u := &Upstream{Dial: "192.0.2.3:80"}
+	u.fillDynamicHost()
+
+	dynamicHostsMu.RLock()
+	first := dynamicHosts["192.0.2.3:80"].lastSeen
+	dynamicHostsMu.RUnlock()
+
+	// Ensure measurable time passes.
+	time.Sleep(2 * time.Millisecond)
+
+	u2 := &Upstream{Dial: "192.0.2.3:80"}
+	u2.fillDynamicHost()
+
+	dynamicHostsMu.RLock()
+	second := dynamicHosts["192.0.2.3:80"].lastSeen
+	dynamicHostsMu.RUnlock()
+
+	if !second.After(first) {
+		t.Error("expected lastSeen to be updated on second fillDynamicHost call")
+	}
+}
+
+// TestFillDynamicHostIndependentAddresses verifies that different addresses get
+// independent Host entries.
+func TestFillDynamicHostIndependentAddresses(t *testing.T) {
+	resetDynamicHosts()
+
+	u1 := &Upstream{Dial: "192.0.2.4:80"}
+	u1.fillDynamicHost()
+
+	u2 := &Upstream{Dial: "192.0.2.5:80"}
+	u2.fillDynamicHost()
+
+	if u1.Host == u2.Host {
+		t.Error("different addresses should have different *Host entries")
+	}
+}
+
+// TestFillDynamicHostPreservesFailCount verifies that fail counts on a dynamic
+// host survive across multiple fillDynamicHost calls (simulating sequential
+// requests), which is the core behaviour fixed by this change.
+func TestFillDynamicHostPreservesFailCount(t *testing.T) {
+	resetDynamicHosts()
+
+	// First "request": provision and record a failure.
+	u1 := &Upstream{Dial: "192.0.2.6:80"}
+	u1.fillDynamicHost()
+	_ = u1.Host.countFail(1)
+
+	if u1.Host.Fails() != 1 {
+		t.Fatalf("expected 1 fail, got %d", u1.Host.Fails())
+	}
+
+	// Second "request": provision the same address again (new *Upstream, same address).
+	u2 := &Upstream{Dial: "192.0.2.6:80"}
+	u2.fillDynamicHost()
+
+	if u2.Host.Fails() != 1 {
+		t.Errorf("expected fail count to persist across fillDynamicHost calls, got %d", u2.Host.Fails())
+	}
+}
+
+// TestProvisionUpstreamDynamic verifies that provisionUpstream with dynamic=true
+// uses fillDynamicHost (not the UsagePool) and sets healthCheckPolicy /
+// MaxRequests correctly from handler config.
+func TestProvisionUpstreamDynamic(t *testing.T) {
+	resetDynamicHosts()
+
+	passive := &PassiveHealthChecks{
+		FailDuration:          caddy.Duration(10 * time.Second),
+		MaxFails:              3,
+		UnhealthyRequestCount: 5,
+	}
+	h := Handler{
+		HealthChecks: &HealthChecks{
+			Passive: passive,
+		},
+	}
+
+	u := &Upstream{Dial: "192.0.2.7:80"}
+	h.provisionUpstream(u, true)
+
+	if u.Host == nil {
+		t.Fatal("Host should be set after provisionUpstream")
+	}
+	if u.healthCheckPolicy != passive {
+		t.Error("healthCheckPolicy should point to the handler's PassiveHealthChecks")
+	}
+	if u.MaxRequests != 5 {
+		t.Errorf("expected MaxRequests=5 from UnhealthyRequestCount, got %d", u.MaxRequests)
+	}
+
+	// Must be in dynamicHosts, not in the static UsagePool.
+	dynamicHostsMu.RLock()
+	_, inDynamic := dynamicHosts["192.0.2.7:80"]
+	dynamicHostsMu.RUnlock()
+	if !inDynamic {
+		t.Error("dynamic upstream should be stored in dynamicHosts")
+	}
+	_, inPool := hosts.References("192.0.2.7:80")
+	if inPool {
+		t.Error("dynamic upstream should NOT be stored in the static UsagePool")
+	}
+}
+
+// TestProvisionUpstreamStatic verifies that provisionUpstream with dynamic=false
+// uses the UsagePool and does NOT insert into dynamicHosts.
+func TestProvisionUpstreamStatic(t *testing.T) {
+	resetDynamicHosts()
+
+	h := Handler{}
+
+	u := &Upstream{Dial: "192.0.2.8:80"}
+	h.provisionUpstream(u, false)
+
+	if u.Host == nil {
+		t.Fatal("Host should be set after provisionUpstream")
+	}
+
+	refs, inPool := hosts.References("192.0.2.8:80")
+	if !inPool {
+		t.Error("static upstream should be in the UsagePool")
+	}
+	if refs != 1 {
+		t.Errorf("expected ref count 1, got %d", refs)
+	}
+
+	dynamicHostsMu.RLock()
+	_, inDynamic := dynamicHosts["192.0.2.8:80"]
+	dynamicHostsMu.RUnlock()
+	if inDynamic {
+		t.Error("static upstream should NOT be in dynamicHosts")
+	}
+
+	// Clean up the pool entry we just added.
+	_, _ = hosts.Delete("192.0.2.8:80")
+}
+
+// TestDynamicHostHealthyConsultsFails verifies the end-to-end passive health
+// check path: after enough failures are recorded against a dynamic upstream's
+// shared *Host, Healthy() returns false for a newly provisioned *Upstream with
+// the same address.
+func TestDynamicHostHealthyConsultsFails(t *testing.T) {
+	resetDynamicHosts()
+
+	passive := &PassiveHealthChecks{
+		FailDuration: caddy.Duration(time.Minute),
+		MaxFails:     2,
+	}
+	h := Handler{
+		HealthChecks: &HealthChecks{Passive: passive},
+	}
+
+	// First request: provision and record two failures.
+	u1 := &Upstream{Dial: "192.0.2.9:80"}
+	h.provisionUpstream(u1, true)
+
+	_ = u1.Host.countFail(1)
+	_ = u1.Host.countFail(1)
+
+	// Second request: fresh *Upstream, same address.
+	u2 := &Upstream{Dial: "192.0.2.9:80"}
+	h.provisionUpstream(u2, true)
+
+	if u2.Healthy() {
+		t.Error("upstream should be unhealthy after MaxFails failures have been recorded against its shared Host")
+	}
+}
+
+// TestDynamicHostCleanupEvictsStaleEntries verifies that the cleanup sweep
+// removes entries whose lastSeen is older than dynamicHostIdleExpiry.
+func TestDynamicHostCleanupEvictsStaleEntries(t *testing.T) {
+	resetDynamicHosts()
+
+	const addr = "192.0.2.10:80"
+
+	// Insert an entry directly with a lastSeen far in the past.
+	dynamicHostsMu.Lock()
+	dynamicHosts[addr] = dynamicHostEntry{
+		host:     new(Host),
+		lastSeen: time.Now().Add(-2 * dynamicHostIdleExpiry),
+	}
+	dynamicHostsMu.Unlock()
+
+	// Run the cleanup logic inline (same logic as the goroutine).
+	dynamicHostsMu.Lock()
+	for a, entry := range dynamicHosts {
+		if time.Since(entry.lastSeen) > dynamicHostIdleExpiry {
+			delete(dynamicHosts, a)
+		}
+	}
+	dynamicHostsMu.Unlock()
+
+	dynamicHostsMu.RLock()
+	_, stillPresent := dynamicHosts[addr]
+	dynamicHostsMu.RUnlock()
+
+	if stillPresent {
+		t.Error("stale dynamic host entry should have been evicted by cleanup sweep")
+	}
+}
+
+// TestDynamicHostCleanupRetainsFreshEntries verifies that the cleanup sweep
+// keeps entries whose lastSeen is within dynamicHostIdleExpiry.
+func TestDynamicHostCleanupRetainsFreshEntries(t *testing.T) {
+	resetDynamicHosts()
+
+	const addr = "192.0.2.11:80"
+
+	dynamicHostsMu.Lock()
+	dynamicHosts[addr] = dynamicHostEntry{
+		host:     new(Host),
+		lastSeen: time.Now(),
+	}
+	dynamicHostsMu.Unlock()
+
+	// Run the cleanup logic inline.
+	dynamicHostsMu.Lock()
+	for a, entry := range dynamicHosts {
+		if time.Since(entry.lastSeen) > dynamicHostIdleExpiry {
+			delete(dynamicHosts, a)
+		}
+	}
+	dynamicHostsMu.Unlock()
+
+	dynamicHostsMu.RLock()
+	_, stillPresent := dynamicHosts[addr]
+	dynamicHostsMu.RUnlock()
+
+	if !stillPresent {
+		t.Error("fresh dynamic host entry should be retained by cleanup sweep")
+	}
+}
+
+// TestDynamicHostConcurrentFillHost verifies that concurrent calls to
+// fillDynamicHost for the same address all get the same *Host pointer and
+// don't race (run with -race).
+func TestDynamicHostConcurrentFillHost(t *testing.T) {
+	resetDynamicHosts()
+
+	const addr = "192.0.2.12:80"
+	const goroutines = 50
+
+	var wg sync.WaitGroup
+	hosts := make([]*Host, goroutines)
+
+	for i := range goroutines {
+		wg.Add(1)
+		go func(idx int) {
+			defer wg.Done()
+			u := &Upstream{Dial: addr}
+			u.fillDynamicHost()
+			hosts[idx] = u.Host
+		}(i)
+	}
+	wg.Wait()
+
+	first := hosts[0]
+	for i, h := range hosts {
+		if h != first {
+			t.Errorf("goroutine %d got a different *Host pointer; expected all to share the same entry", i)
+		}
+	}
+}

modules/caddyhttp/reverseproxy/fastcgi/client_test.go

@@ -27,7 +27,7 @@ import (
 	"fmt"
 	"io"
 	"log"
-	"math/rand"
+	"math/rand/v2"
 	"net"
 	"net/http"
 	"net/http/fcgi"
@@ -197,7 +197,7 @@ func generateRandFile(size int) (p string, m string) {
 	h := md5.New()
 	for i := 0; i < size/16; i++ {
 		buf := make([]byte, 16)
-		binary.PutVarint(buf, rand.Int63())
+		binary.PutVarint(buf, rand.Int64())
 		if _, err := fo.Write(buf); err != nil {
 			log.Printf("[ERROR] failed to write buffer: %v\n", err)
 		}

modules/caddyhttp/reverseproxy/fastcgi/fastcgi.go

@@ -16,6 +16,7 @@ package fastcgi
 
 import (
 	"crypto/tls"
+	"errors"
 	"fmt"
 	"net"
 	"net/http"
@@ -23,9 +24,12 @@ import (
 	"strconv"
 	"strings"
 	"time"
+	"unicode/utf8"
 
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
+	"golang.org/x/text/language"
+	"golang.org/x/text/search"
 
 	"github.com/caddyserver/caddy/v2"
 	"github.com/caddyserver/caddy/v2/modules/caddyhttp"
@@ -33,7 +37,11 @@ import (
 	"github.com/caddyserver/caddy/v2/modules/caddytls"
 )
 
-var noopLogger = zap.NewNop()
+var (
+	ErrInvalidSplitPath = errors.New("split path contains non-ASCII characters")
+
+	noopLogger = zap.NewNop()
+)
 
 func init() {
 	caddy.RegisterModule(Transport{})
@@ -50,6 +58,9 @@ type Transport struct {
 	// actual resource (CGI script) name, and the second piece will be set to
 	// PATH_INFO for the CGI script to use.
 	//
+	// Split paths can only contain ASCII characters.
+	// Comparison is case-insensitive.
+	//
 	// Future enhancements should be careful to avoid CVE-2019-11043,
 	// which can be mitigated with use of a try_files-like behavior
 	// that 404s if the fastcgi path info is not found.
@@ -109,9 +120,45 @@ func (t *Transport) Provision(ctx caddy.Context) error {
 		t.DialTimeout = caddy.Duration(3 * time.Second)
 	}
 
+	var b strings.Builder
+
+	for i, split := range t.SplitPath {
+		b.Grow(len(split))
+
+		for j := 0; j < len(split); j++ {
+			c := split[j]
+			if c >= utf8.RuneSelf {
+				return ErrInvalidSplitPath
+			}
+
+			if 'A' <= c && c <= 'Z' {
+				b.WriteByte(c + 'a' - 'A')
+			} else {
+				b.WriteByte(c)
+			}
+		}
+
+		t.SplitPath[i] = b.String()
+		b.Reset()
+	}
+
 	return nil
 }
 
+// DefaultBufferSizes enables request buffering for fastcgi if not configured.
+// This is because most fastcgi servers are php-fpm that require the content length to be set to read the body, golang
+// std has fastcgi implementation that doesn't need this value to process the body, but we can safely assume that's
+// not used.
+// http3 requests have a negative content length for GET and HEAD requests, if that header is not sent.
+// see: https://github.com/caddyserver/caddy/issues/6678#issuecomment-2472224182
+// Though it appears even if CONTENT_LENGTH is invalid, php-fpm can handle just fine if the body is empty (no Stdin records sent).
+// php-fpm will hang if there is any data in the body though, https://github.com/caddyserver/caddy/issues/5420#issuecomment-2415943516
+
+// TODO: better default buffering for fastcgi requests without content length, in theory a value of 1 should be enough, make it bigger anyway
+func (t Transport) DefaultBufferSizes() (int64, int64) {
+	return 4096, 0
+}
+
 // RoundTrip implements http.RoundTripper.
 func (t Transport) RoundTrip(r *http.Request) (*http.Response, error) {
 	server := r.Context().Value(caddyhttp.ServerCtxKey).(*caddyhttp.Server)
@@ -371,8 +418,15 @@ func (t Transport) buildEnv(r *http.Request) (envVars, error) {
 	return env, nil
 }
 
+var splitSearchNonASCII = search.New(language.Und, search.IgnoreCase)
+
 // splitPos returns the index where path should
 // be split based on t.SplitPath.
+//
+// example: if splitPath is [".php"]
+// "/path/to/script.php/some/path": ("/path/to/script.php", "/some/path")
+//
+// Adapted from FrankenPHP's code (copyright 2026 Kévin Dunglas, MIT license)
 func (t Transport) splitPos(path string) int {
 	// TODO: from v1...
 	// if httpserver.CaseSensitivePath {
@@ -382,12 +436,54 @@ func (t Transport) splitPos(path string) int {
 		return 0
 	}
 
-	lowerPath := strings.ToLower(path)
+	pathLen := len(path)
+
+	// We are sure that split strings are all ASCII-only and lower-case because of validation and normalization in Provision().
 	for _, split := range t.SplitPath {
-		if idx := strings.Index(lowerPath, strings.ToLower(split)); idx > -1 {
-			return idx + len(split)
+		splitLen := len(split)
+
+		for i := range pathLen {
+			if path[i] >= utf8.RuneSelf {
+				if _, end := splitSearchNonASCII.IndexString(path, split); end > -1 {
+					return end
+				}
+
+				break
+			}
+
+			if i+splitLen > pathLen {
+				continue
+			}
+
+			match := true
+			for j := range splitLen {
+				c := path[i+j]
+
+				if c >= utf8.RuneSelf {
+					if _, end := splitSearchNonASCII.IndexString(path, split); end > -1 {
+						return end
+					}
+
+					break
+				}
+
+				if 'A' <= c && c <= 'Z' {
+					c += 'a' - 'A'
+				}
+
+				if c != split[j] {
+					match = false
+
+					break
+				}
+			}
+
+			if match {
+				return i + splitLen
+			}
 		}
 	}
+
 	return -1
 }
 
@@ -427,6 +523,7 @@ var headerNameReplacer = strings.NewReplacer(" ", "_", "-", "_")
 var (
 	_ zapcore.ObjectMarshaler = (*loggableEnv)(nil)
 
-	_ caddy.Provisioner = (*Transport)(nil)
-	_ http.RoundTripper = (*Transport)(nil)
+	_ caddy.Provisioner              = (*Transport)(nil)
+	_ http.RoundTripper              = (*Transport)(nil)
+	_ reverseproxy.BufferedTransport = (*Transport)(nil)
 )

modules/caddyhttp/reverseproxy/fastcgi/fastcgi_test.go

@@ -0,0 +1,246 @@
+package fastcgi
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/caddyserver/caddy/v2"
+)
+
+func TestProvisionSplitPath(t *testing.T) {
+	tests := []struct {
+		name          string
+		splitPath     []string
+		wantErr       error
+		wantSplitPath []string
+	}{
+		{
+			name:          "valid lowercase split path",
+			splitPath:     []string{".php"},
+			wantErr:       nil,
+			wantSplitPath: []string{".php"},
+		},
+		{
+			name:          "valid uppercase split path normalized",
+			splitPath:     []string{".PHP"},
+			wantErr:       nil,
+			wantSplitPath: []string{".php"},
+		},
+		{
+			name:          "valid mixed case split path normalized",
+			splitPath:     []string{".PhP", ".PHTML"},
+			wantErr:       nil,
+			wantSplitPath: []string{".php", ".phtml"},
+		},
+		{
+			name:          "empty split path",
+			splitPath:     []string{},
+			wantErr:       nil,
+			wantSplitPath: []string{},
+		},
+		{
+			name:      "non-ASCII character in split path rejected",
+			splitPath: []string{".php", ".Ⱥphp"},
+			wantErr:   ErrInvalidSplitPath,
+		},
+		{
+			name:      "unicode character in split path rejected",
+			splitPath: []string{".phpⱥ"},
+			wantErr:   ErrInvalidSplitPath,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tr := Transport{SplitPath: tt.splitPath}
+			err := tr.Provision(caddy.Context{})
+
+			if tt.wantErr != nil {
+				require.ErrorIs(t, err, tt.wantErr)
+
+				return
+			}
+
+			require.NoError(t, err)
+			assert.Equal(t, tt.wantSplitPath, tr.SplitPath)
+		})
+	}
+}
+
+func TestSplitPos(t *testing.T) {
+	tests := []struct {
+		name      string
+		path      string
+		splitPath []string
+		wantPos   int
+	}{
+		{
+			name:      "simple php extension",
+			path:      "/path/to/script.php",
+			splitPath: []string{".php"},
+			wantPos:   19,
+		},
+		{
+			name:      "php extension with path info",
+			path:      "/path/to/script.php/some/path",
+			splitPath: []string{".php"},
+			wantPos:   19,
+		},
+		{
+			name:      "case insensitive match",
+			path:      "/path/to/script.PHP",
+			splitPath: []string{".php"},
+			wantPos:   19,
+		},
+		{
+			name:      "mixed case match",
+			path:      "/path/to/script.PhP/info",
+			splitPath: []string{".php"},
+			wantPos:   19,
+		},
+		{
+			name:      "no match",
+			path:      "/path/to/script.txt",
+			splitPath: []string{".php"},
+			wantPos:   -1,
+		},
+		{
+			name:      "empty split path",
+			path:      "/path/to/script.php",
+			splitPath: []string{},
+			wantPos:   0,
+		},
+		{
+			name:      "multiple split paths first match",
+			path:      "/path/to/script.php",
+			splitPath: []string{".php", ".phtml"},
+			wantPos:   19,
+		},
+		{
+			name:      "multiple split paths second match",
+			path:      "/path/to/script.phtml",
+			splitPath: []string{".php", ".phtml"},
+			wantPos:   21,
+		},
+		// Unicode case-folding tests (security fix for GHSA-g966-83w7-6w38)
+		// U+023A (Ⱥ) lowercases to U+2C65 (ⱥ), which has different UTF-8 byte length
+		// Ⱥ: 2 bytes (C8 BA), ⱥ: 3 bytes (E2 B1 A5)
+		{
+			name:      "unicode path with case-folding length expansion",
+			path:      "/ȺȺȺȺshell.php",
+			splitPath: []string{".php"},
+			wantPos:   18, // correct position in original string
+		},
+		{
+			name:      "unicode path with extension after expansion chars",
+			path:      "/ȺȺȺȺshell.php/path/info",
+			splitPath: []string{".php"},
+			wantPos:   18,
+		},
+		{
+			name:      "unicode in filename with multiple php occurrences",
+			path:      "/ȺȺȺȺshell.php.txt.php",
+			splitPath: []string{".php"},
+			wantPos:   18, // should match first .php, not be confused by byte offset shift
+		},
+		{
+			name:      "unicode case insensitive extension",
+			path:      "/ȺȺȺȺshell.PHP",
+			splitPath: []string{".php"},
+			wantPos:   18,
+		},
+		{
+			name:      "unicode in middle of path",
+			path:      "/path/Ⱥtest/script.php",
+			splitPath: []string{".php"},
+			wantPos:   23, // Ⱥ is 2 bytes, so path is 23 bytes total, .php ends at byte 23
+		},
+		{
+			name:      "unicode only in directory not filename",
+			path:      "/Ⱥ/script.php",
+			splitPath: []string{".php"},
+			wantPos:   14,
+		},
+		// Additional Unicode characters that expand when lowercased
+		// U+0130 (İ - Turkish capital I with dot) lowercases to U+0069 + U+0307
+		{
+			name:      "turkish capital I with dot",
+			path:      "/İtest.php",
+			splitPath: []string{".php"},
+			wantPos:   11,
+		},
+		// Ensure standard ASCII still works correctly
+		{
+			name:      "ascii only path with case variation",
+			path:      "/PATH/TO/SCRIPT.PHP/INFO",
+			splitPath: []string{".php"},
+			wantPos:   19,
+		},
+		{
+			name:      "path at root",
+			path:      "/index.php",
+			splitPath: []string{".php"},
+			wantPos:   10,
+		},
+		{
+			name:      "extension in middle of filename",
+			path:      "/test.php.bak",
+			splitPath: []string{".php"},
+			wantPos:   9,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			gotPos := Transport{SplitPath: tt.splitPath}.splitPos(tt.path)
+			assert.Equal(t, tt.wantPos, gotPos, "splitPos(%q, %v)", tt.path, tt.splitPath)
+
+			// Verify that the split produces valid substrings
+			if gotPos > 0 && gotPos <= len(tt.path) {
+				scriptName := tt.path[:gotPos]
+				pathInfo := tt.path[gotPos:]
+
+				// The script name should end with one of the split extensions (case-insensitive)
+				hasValidEnding := false
+				for _, split := range tt.splitPath {
+					if strings.HasSuffix(strings.ToLower(scriptName), split) {
+						hasValidEnding = true
+						break
+					}
+				}
+				assert.True(t, hasValidEnding, "script name %q should end with one of %v", scriptName, tt.splitPath)
+
+				// Original path should be reconstructable
+				assert.Equal(t, tt.path, scriptName+pathInfo, "path should be reconstructable from split parts")
+			}
+		})
+	}
+}
+
+// TestSplitPosUnicodeSecurityRegression specifically tests the vulnerability
+// described in GHSA-g966-83w7-6w38 where Unicode case-folding caused
+// incorrect SCRIPT_NAME/PATH_INFO splitting
+func TestSplitPosUnicodeSecurityRegression(t *testing.T) {
+	// U+023A: Ⱥ (UTF-8: C8 BA). Lowercase is ⱥ (UTF-8: E2 B1 A5), longer in bytes.
+	path := "/ȺȺȺȺshell.php.txt.php"
+	split := []string{".php"}
+
+	pos := Transport{SplitPath: split}.splitPos(path)
+
+	// The vulnerable code would return 22 (computed on lowercased string)
+	// The correct code should return 18 (position in original string)
+	expectedPos := strings.Index(path, ".php") + len(".php")
+	assert.Equal(t, expectedPos, pos, "split position should match first .php in original string")
+	assert.Equal(t, 18, pos, "split position should be 18, not 22")
+
+	if pos > 0 && pos <= len(path) {
+		scriptName := path[:pos]
+		pathInfo := path[pos:]
+
+		assert.Equal(t, "/ȺȺȺȺshell.php", scriptName, "script name should be the path up to first .php")
+		assert.Equal(t, ".txt.php", pathInfo, "path info should be the remainder after first .php")
+	}
+}

modules/caddyhttp/reverseproxy/fastcgi/writer.go

@@ -112,7 +112,7 @@ func encodeSize(b []byte, size uint32) int {
 		binary.BigEndian.PutUint32(b, size)
 		return 4
 	}
-	b[0] = byte(size)
+	b[0] = byte(size) //nolint:gosec // false positive; b is made 8 bytes long, then this function is always called with b being at least 4 or 1 byte long
 	return 1
 }
 

modules/caddyhttp/reverseproxy/forwardauth/caddyfile.go

@@ -208,6 +208,24 @@ func parseCaddyfile(h httpcaddyfile.Helper) ([]httpcaddyfile.ConfigValue, error)
 	for _, from := range sortedHeadersToCopy {
 		to := http.CanonicalHeaderKey(headersToCopy[from])
 		placeholderName := "http.reverse_proxy.header." + http.CanonicalHeaderKey(from)
+
+		// Always delete the client-supplied header before conditionally setting
+		// it from the auth response. Without this, a client that pre-supplies a
+		// header listed in copy_headers can inject arbitrary values when the auth
+		// service does not return that header: the MatchNot guard below would
+		// skip the Set entirely, leaving the original client-controlled value
+		// intact and forwarding it to the backend.
+		copyHeaderRoutes = append(copyHeaderRoutes, caddyhttp.Route{
+			HandlersRaw: []json.RawMessage{caddyconfig.JSONModuleObject(
+				&headers.Handler{
+					Request: &headers.HeaderOps{
+						Delete: []string{to},
+					},
+				},
+				"handler", "headers", nil,
+			)},
+		})
+
 		handler := &headers.Handler{
 			Request: &headers.HeaderOps{
 				Set: http.Header{