Heck's Blog

项目要做一个后台消息推送，在测试过程中,发现每隔1分半自由,WebSocket会走OnError方法,将异常抛出,异常是java.io.EOFException.然后走@OnClose方法,将连接自动关闭,首先需要加上心跳，并且将nginx中加上proxy_read_timeout 设置为 2000s。

     heartCheckFun(){
        var that = this;
        //心跳检测,每20s心跳一次
        that.heartCheck = {
          timeout: 20000,
          timeoutObj: null,
          serverTimeoutObj: null,
          reset: function(){
            clearTimeout(this.timeoutObj);
            clearTimeout(this.serverTimeoutObj);
            return this;
          },
          start: function(){
            var self = this;
            this.timeoutObj = setTimeout(function(){
              //这里发送一个心跳，后端收到后，返回一个心跳消息，
              //onmessage拿到返回的心跳就说明连接正常
              that.websocketSend("HeartBeat");
              console.info("客户端发送心跳");
              self.serverTimeoutObj = setTimeout(function(){//如果超过一定时间还没重置，说明后端主动断开了
                that.websock.close();//如果onclose会执行reconnect，我们执行ws.close()就行了.如果直接执行reconnect 会触发onclose导致重连两次
              }, self.timeout)
            }, this.timeout)
          }
        }
      },

nginx的设置为:
location /{
      proxy_pass http://xx.xxx.xxx.xx:xxxx;
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";
      proxy_read_timeout 2000s;
      keepalive_timeout  2000s;
            proxy_set_header   Host    $host;
      proxy_set_header   X-Real-IP   $remote_addr;
      proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
  }

尽管设置2000s,但是当到达设置时间,如果websocket没有进行通讯,还是会断开连接.可以前端做一个心跳检测,每隔20秒钟发起一次通信就行.

希望能帮到你;