How to configure connection timeout? about web_socket_channel HOT 3 CLOSED

var client = new HttpClient();
      var request = await client.openUrl(
          "GET", Uri.parse("http://localhost:${server.port}"));
      request.headers
        ..set("Connection", "Upgrade")
        ..set("Upgrade", "websocket")
        ..set("Sec-WebSocket-Key", "x3JJHMbDL1EzLkh9GBhXDw==")
        ..set("Sec-WebSocket-Version", "13");

      var response = await request.close();
      var socket = await response.detachSocket();
      var innerChannel = new StreamChannel<List<int>>(socket, socket);
      var webSocket = new WebSocketChannel(innerChannel, serverSide: false);