diff --git a/HttpServer/Route/Router.php b/HttpServer/Route/Router.php
index b87ede6f..70c84a0d 100644
--- a/HttpServer/Route/Router.php
+++ b/HttpServer/Route/Router.php
@@ -477,7 +477,7 @@ class Router extends Application implements RouterInterface
 	{
 		try {
 			if ($this->reading) {
-				return send(self::NOT_FOUND, 404);
+				return send(self::NOT_FOUND, 502);
 			}
 			/** @var Node $node */
 			if (!($node = $this->find_path(\request()))) {