diff -r db4911b0c721 -r 445e01aede7e vendor/github.com/gorilla/websocket/server.go
--- a/vendor/github.com/gorilla/websocket/server.go	Tue Aug 23 22:33:28 2022 +0200
+++ b/vendor/github.com/gorilla/websocket/server.go	Tue Aug 23 22:39:43 2022 +0200
@@ -23,6 +23,8 @@
 
 // Upgrader specifies parameters for upgrading an HTTP connection to a
 // WebSocket connection.
+//
+// It is safe to call Upgrader's methods concurrently.
 type Upgrader struct {
 	// HandshakeTimeout specifies the duration for the handshake to complete.
 	HandshakeTimeout time.Duration
@@ -115,8 +117,8 @@
 // Upgrade upgrades the HTTP server connection to the WebSocket protocol.
 //
 // The responseHeader is included in the response to the client's upgrade
-// request. Use the responseHeader to specify cookies (Set-Cookie) and the
-// application negotiated subprotocol (Sec-WebSocket-Protocol).
+// request. Use the responseHeader to specify cookies (Set-Cookie). To specify
+// subprotocols supported by the server, set Upgrader.Subprotocols directly.
 //
 // If the upgrade fails, then Upgrade replies to the client with an HTTP error
 // response.
@@ -131,7 +133,7 @@
 		return u.returnError(w, r, http.StatusBadRequest, badHandshake+"'websocket' token not found in 'Upgrade' header")
 	}
 
-	if r.Method != "GET" {
+	if r.Method != http.MethodGet {
 		return u.returnError(w, r, http.StatusMethodNotAllowed, badHandshake+"request method is not GET")
 	}