Stabilize feature absolute-headers.

src/main.go

@@ -45,11 +45,12 @@ func configureFeatures(ctx context.Context) (err error) {
 	for _, feature := range config.Features {
 		switch feature {
 		// Work-in-progress features:
-		case "preview", "expiration", "absolute-headers":
+		case "preview", "expiration":
 		// Permanently unstable features:
 		case "codeberg-pages-compat", "relaxed-idna":
 		// Stabilized features:
-		case "archive-site", "audit", "compress", "patch", "serve-h2c", "existence-cache":
+		case "archive-site", "audit", "compress", "patch", "serve-h2c", "existence-cache",
+			"absolute-headers":
 			logc.Printf(ctx, "feature %s has been stabilized", feature)
 		// Removed or renamed features:
 		case "h2c", "sentry-telemetry-buffer", "site-existence-cache", "domain-existence-cache":

src/pages.go

@@ -460,10 +460,7 @@ func getPage(w http.ResponseWriter, r *http.Request) error {
 		w.Header().Set("Content-Type", *entry.ContentType)
 	}
 
-	headersMatchURL := &url.URL{Path: entryPath}
-	if config.Feature("absolute-headers") {
-		headersMatchURL = (&url.URL{Host: r.Host}).ResolveReference(r.URL)
-	}
+	headersMatchURL := (&url.URL{Host: r.Host}).ResolveReference(r.URL)
 	customHeaders, err := ApplyHeaderRules(manifest, headersMatchURL)
 	if err != nil {
 		// This is an "internal server error" from an HTTP point of view, but also