Improve serve mux path

pkg/srv/http/opts/http_config.go

@@ -22,7 +22,8 @@ type HTTPFunc struct {
 }
 
 type HTTPHandler struct {
-	Prefix      string // path prefix under which to serve this handler/mux
+	Prefix      string // path prefix under which to serve this handler/mux, used for convenience
+	Pattern     string // pattern match
 	StripPrefix bool   // strip path before sending to handler/mux
 	Handler     http.Handler
 }