reverseproxy: Implement health_uri, deprecate health_path, supports query (#4050)

* reverseproxy: Implement health_uri, replaces health_path, supports query

Also fixes a bug with `health_status` Caddyfile parsing , it would always only take the first character of the status code even if it didn't end with "xx".

* reverseproxy: Rename to URI, named logger, warn in Provision (for JSON)

modules/caddyhttp/reverseproxy/reverseproxy.go

@@ -23,6 +23,7 @@ import (
 	"io"
 	"net"
 	"net/http"
+	"net/url"
 	"regexp"
 	"strconv"
 	"strings"
@@ -273,8 +274,10 @@ func (h *Handler) Provision(ctx caddy.Context) error {
 		}
 
 		// if active health checks are enabled, configure them and start a worker
-		if h.HealthChecks.Active != nil &&
-			(h.HealthChecks.Active.Path != "" || h.HealthChecks.Active.Port != 0) {
+		if h.HealthChecks.Active != nil && (h.HealthChecks.Active.Path != "" ||
+			h.HealthChecks.Active.URI != "" ||
+			h.HealthChecks.Active.Port != 0) {
+
 			h.HealthChecks.Active.logger = h.logger.Named("health_checker.active")
 
 			timeout := time.Duration(h.HealthChecks.Active.Timeout)
@@ -282,6 +285,19 @@ func (h *Handler) Provision(ctx caddy.Context) error {
 				timeout = 5 * time.Second
 			}
 
+			if h.HealthChecks.Active.Path != "" {
+				h.HealthChecks.Active.logger.Warn("the 'path' option is deprecated, please use 'uri' instead!")
+			}
+
+			// parse the URI string (supports path and query)
+			if h.HealthChecks.Active.URI != "" {
+				parsedURI, err := url.Parse(h.HealthChecks.Active.URI)
+				if err != nil {
+					return err
+				}
+				h.HealthChecks.Active.uri = parsedURI
+			}
+
 			h.HealthChecks.Active.httpClient = &http.Client{
 				Timeout:   timeout,
 				Transport: h.Transport,