fix: limit max close message size

0x416e746f6e · 0x416e746f6e · commit 20bd8ac7adbf · 2025-06-16T18:17:23.000+02:00
diff --git a/proxy/websocket.go b/proxy/websocket.go
@@ -381,7 +381,8 @@ func (p *Websocket) closeWebsocket(conn *websocket.Conn, reason error) error {
 
 	return errors.Join(
 		conn.WriteControl(
-			websocket.CloseMessage, []byte(reason.Error()), utils.Deadline(p.cfg.proxy.ControlTimeout),
+			// maxControlFramePayloadSize == 125
+			websocket.CloseMessage, []byte(reason.Error())[:125], utils.Deadline(p.cfg.proxy.ControlTimeout),
 		),
 		conn.Close(),
 	)

Original file line number	Diff line number	Diff line change
`@@ -381,7 +381,8 @@ func (p Websocket) closeWebsocket(conn websocket.Conn, reason error) error {`
`381`	`381`
`382`	`382`	`return errors.Join(`
`383`	`383`	`conn.WriteControl(`
`384`		`- websocket.CloseMessage, []byte(reason.Error()), utils.Deadline(p.cfg.proxy.ControlTimeout),`
	`384`	`+ // maxControlFramePayloadSize == 125`
	`385`	`+ websocket.CloseMessage, []byte(reason.Error())[:125], utils.Deadline(p.cfg.proxy.ControlTimeout),`
`385`	`386`	`),`
`386`	`387`	`conn.Close(),`
`387`	`388`	`)`