Google云计算引擎在服务器处理Websocket连接之前将其关闭

Question

尝试连接到Google云计算引擎spring websocket服务器的客户端正在关闭连接：立即达到1000。我在做什么错？

我正在Google云计算引擎实例上运行spring websocket / rest服务器。防火墙规则已正确配置，并且可以通过浏览器连接到VM，但是如果我尝试打开websocket连接，则会立即关闭。将websocket连接到我的本地计算机上的同一台服务器不会出现任何问题，并且http日志记录表明该服务器从不接收启动请求。 websocket客户端收到的连接已关闭：1000。这是websocket客户端代码：

`

void clientConnect(){
  Serial.print("Sending connection to: ");
  HTTPClient http;
  http.begin(SERVER_ADDR);
  int httpCode = http.GET();
  if(httpCode > 0){
    String parload = http.getString();
    http.end();
    int url = parload.indexOf("http");
    int lastUrl = parload.lastIndexOf("\"");
    String u = parload.substring(url + 4,lastUrl);
    serverUrl = u;
  }
  Serial.println(serverUrl);
  clnt.begin("35.247.188.177",80,"/network");
  clnt.setReconnectInterval(RECONNECT_DELAY);
}
    void gotEvent(WStype_t type, uint8_t * payload, size_t length) {
  switch(type) {
    case WStype_DISCONNECTED:
      Serial.printf("[WSc] Disconnected!\n");
      break;
    case WStype_CONNECTED: {
      Serial.printf("[WSc] Connected to url: %s\n", payload);
      // send message to server when Connected
      clnt.sendTXT("Connected");
    }
      break;
    case WStype_TEXT:
      Serial.printf("[WSc] get text: %s\n", payload);
      // send message to server
      // webSocket.sendTXT("message here");
      break;
    case WStype_BIN:
      Serial.printf("[WSc] get binary length: %u\n", length);
      // send data to server
      // webSocket.sendBIN(payload, length);
  break;
    case WStype_PING:
        // pong will be send automatically
        Serial.printf("[WSc] get ping\n");
            break;
        case WStype_PONG:
            // answer to a ping we send
            Serial.printf("[WSc] get pong\n");
            break;
    }
}

Websocket服务器配置：

    @Configuration
@EnableWebSocket
public class WebSocketConfiguration implements WebSocketConfigurer {
    private static Logger logger = LoggerFactory.getLogger(WebSocketConfiguration.class);

    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry webSocketHandlerRegistry) {
        logger.info("Registering websocket handlers");
        webSocketHandlerRegistry.addHandler(new DoorSocketConnectionHandler(),"/network").setAllowedOrigins("*");
    }
}

客户端通过本地网络在我的本地计算机上连接没有问题，但是将服务器移至Google云计算引擎服务器后，它们立即被关闭。 HTTP日志显示服务器从未收到启动请求，并且spring / actuator / httptrace日志为空