如何在Phantom.js中监视WebSocket通信? [英] How to monitor WebSocket communication in Phantom.js?

问题描述

Phantom.js文档显示了如何监视HTTP通信: http://phantomjs.org/network-monitoring .html

Phantom.js documentation shows how to monitor HTTP communication: http://phantomjs.org/network-monitoring.html

但是，它不适用于WebSockets.如何在Phantom.js中监视WebSocket通信?

However, it does not work for WebSockets. How can I monitor WebSocket communication in Phantom.js?

推荐答案

PhantomJS 1.x不支持WebSockets ¹ ，因此您无法对其进行监视.如果页面使用WebSockets的后备，则 page.onResourceRequested 和 page.onResourceReceived 可以用于记录元数据的消息. PhantomJS不会公开以任何方式发送的实际数据.

PhantomJS 1.x does not support WebSockets¹, so you cannot monitor them. If the page uses some fallback for WebSockets, then the page.onResourceRequested and page.onResourceReceived can be used to log the meta data of the messages. PhantomJS does not expose the actual data sent in any way.

WebSockets在PhantomJS 2中正常工作.由于不需要回退，因此不可能观察那些事件的流量.上面提到的事件处理程序不显示任何内容.查看消息的唯一方法是尽早代理WebSocket对象:

WebSockets work correctly in PhantomJS 2. Since no fallback is necessary, it is not possible to observe the traffic with those events. The event handlers mentioned above don't show anything. The only way to see the messages would be to proxy the WebSocket object as early as possible:

page.onInitialized = function(){
    page.evaluate(function(){
        (function(w){
            var oldWS = w.WebSocket;
            w.WebSocket = function(uri){
                this.ws = new oldWS(uri);
                ...
            };
            w.WebSocket.prototype.send = function(msg){
                w.callPhantom({type: "ws", sent: "msg"});
                this.ws.send(msg);
            };
            ...
        })(window);
    });
};
page.onCallback = function(data){
    console.log(JSON.stringify(data, undefined, 4));
};

¹ 我的测试实际上表明 websocket回显页面是有效的使用v1.9.6及更高版本，但不支持v1.9.0.

¹ My tests actually show that the websocket echo page works with v1.9.6 and up, but not v1.9.0.

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