User Story

As an app dev, I want to know the reason for closing a WebSocket connection, so that I can decide to take further action e.g. debug or fix an error.

Acceptance Criteria

provide a way to check close reason

Details

• In ZK-5220, the websokcet closes suddenly, if zk prints CloseEvent.reason, it's easier to locate the root cause. In the future, a websocket might close a connect in any reason, a log of closing reason is helpful for debugging.

• zWs.Manager
  onClose: function onClose(reason){
      //print the reason
  }
  

• suggest rename the onClose() argument, reason, to closeEvent and print closeEvent.reason