--- a/vendor/github.com/gorilla/websocket/mask_safe.go	Tue Aug 23 22:33:28 2022 +0200
+++ b/vendor/github.com/gorilla/websocket/mask_safe.go	Tue Aug 23 22:39:43 2022 +0200
@@ -2,6 +2,7 @@
 // this source code is governed by a BSD-style license that can be found in the
 // LICENSE file.
 
+//go:build appengine
 // +build appengine
 
 package websocket