From abe0acabb61b0151f58c7b750d3963dbbffe7270 Mon Sep 17 00:00:00 2001
From: WeidiDeng <weidi_deng@icloud.com>
Date: Sat, 25 Oct 2025 17:15:55 +0800
Subject: [PATCH] reverseproxy: set default values for keepalive if only some
 of them are set (#7318)

---
 modules/caddyhttp/reverseproxy/httptransport.go | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/modules/caddyhttp/reverseproxy/httptransport.go b/modules/caddyhttp/reverseproxy/httptransport.go
index e8cd50b3b..1e4cfa743 100644
--- a/modules/caddyhttp/reverseproxy/httptransport.go
+++ b/modules/caddyhttp/reverseproxy/httptransport.go
@@ -204,11 +204,16 @@ func (h *HTTPTransport) Provision(ctx caddy.Context) error {
 func (h *HTTPTransport) NewTransport(caddyCtx caddy.Context) (*http.Transport, error) {
 	// Set keep-alive defaults if it wasn't otherwise configured
 	if h.KeepAlive == nil {
-		h.KeepAlive = &KeepAlive{
-			ProbeInterval:       caddy.Duration(30 * time.Second),
-			IdleConnTimeout:     caddy.Duration(2 * time.Minute),
-			MaxIdleConnsPerHost: 32, // seems about optimal, see #2805
-		}
+		h.KeepAlive = new(KeepAlive)
+	}
+	if h.KeepAlive.ProbeInterval == 0 {
+		h.KeepAlive.ProbeInterval = caddy.Duration(30 * time.Second)
+	}
+	if h.KeepAlive.IdleConnTimeout == 0 {
+		h.KeepAlive.IdleConnTimeout = caddy.Duration(2 * time.Minute)
+	}
+	if h.KeepAlive.MaxIdleConnsPerHost == 0 {
+		h.KeepAlive.MaxIdleConnsPerHost = 32 // seems about optimal, see #2805
 	}
 
 	// Set a relatively short default dial timeout.