Remove TLS requirement for gRPC client

transport/v2rayhttp/client.go

@@ -43,7 +43,9 @@ func NewClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, opt
 			},
 		}
 	} else {
-		tlsConfig.SetNextProtos([]string{http2.NextProtoTLS})
+		if len(tlsConfig.NextProtos()) == 0 {
+			tlsConfig.SetNextProtos([]string{http2.NextProtoTLS})
+		}
 		transport = &http2.Transport{
 			ReadIdleTimeout: time.Duration(options.IdleTimeout),
 			PingTimeout:     time.Duration(options.PingTimeout),