Spring Websocket发送给客户端可以但不能接收？

Question

我服务器上的Spring websockets正在正常发送websocket消息（通过SockJS + STOMP），客户端正在接收它们，但是服务器没有接收到来自客户端的消息，尽管进行了数小时的研究，我仍然看不到任何原因为什么。下面的代码：

客户：

close()

服务器：

// SockJS socket connection does not exist yet, set it up:
if(!this.sockjsclient) {
this.sockjsclient = new SockJS('http://localhost:8080/stomp/');
}

// If STOMP instance (to send messages over the socket) does not exist yet, set it up:
if(!this.stompClient) {
  this.stompClient = Stomp.over(this.sockjsclient);

  // this.stompClient.debug = null // Turn off STOMP's default debug messages
  this.stompClient.connect({}, () => {

    mySubscription = this.stompClient.subscribe(topic, (message) =>  this.updateHeartbeat(message, callbackfn));

      // SEND WEBSOCKET MESSAGE TO SERVER:
      this.stompClient.send("/app/getstatus", {}, 'hello');
  }, () => {
    console.log('Websocket connection error');
  })
}
// STOMP instance already exists, so use that existing connection:
else {
    mySubscription = this.stompClient.subscribe(topic, (message) => this.updateHeartbeat(message, callbackfn));
  }

谢谢