TUN-6343: Fix QUIC->HTTP2 fallback

connection/errors.go

@@ -18,15 +18,6 @@ func (e DupConnRegisterTunnelError) Error() string {
 	return "already connected to this server, trying another address"
 }
 
-// Dial to edge server with quic failed
-type EdgeQuicDialError struct {
-	Cause error
-}
-
-func (e EdgeQuicDialError) Error() string {
-	return "failed to dial to edge with quic: " + e.Cause.Error()
-}
-
 // RegisterTunnel error from server
 type ServerRegisterTunnelError struct {
 	Cause     error

connection/quic.go

@@ -55,7 +55,7 @@ func NewQUICConnection(
 ) (*QUICConnection, error) {
 	session, err := quic.DialAddr(edgeAddr.String(), tlsConfig, quicConfig)
 	if err != nil {
-		return nil, EdgeQuicDialError{Cause: err}
+		return nil, fmt.Errorf("failed to dial to edge: %w", err)
 	}
 
 	datagramMuxer, err := quicpogs.NewDatagramMuxer(session, logger)