(java) Listen to websocket messages with HtmlUnit

问题

I am trying to listen to websocket messages on a particular page.

It seems like HtmlUnit has support for WebSockets, but I can't find any documentation/tutorial or even an answer to: "is it possible to intercept websocket data with htmlUnit"?

What I already tried:

try (final WebClient webClient = new WebClient(BrowserVersion.CHROME)) {

    webClient.getOptions().setJavaScriptEnabled(true);
    webClient.getOptions().setCssEnabled(false);
    webClient.setAjaxController(new NicelyResynchronizingAjaxController());

    final HtmlPage page = webClient.getPage("url");
    webClient.waitForBackgroundJavaScript(10 * 60 * 1000);
}

I get an INFO message about the websocket connection and this error:

INFO: Opening transport: xhr-streaming  url:https://stream71.forexpros.com:443/echo/340/3exyl8ko  RTO:357
Mar 23, 2017 5:40:07 PM com.gargoylesoftware.htmlunit.HttpWebConnection downloadContent
WARNING: Connection was closed while reading from stream.

回答1:

As of now, WebSocket is supported only from the the JavaScript side by this class, and there is no API from HtmlUnit to control it.

The current implementation is basic, I will see if there is a way to intercept the traffic from Jetty Websocket client, it can be added to the public API.

Update:

WebClient now has getInternals().addListener(). Once the listener.created(WebSocket) is called, you should invoke webSocket.setWebSocketListener() with the WebSocketListener.

Test case is here.

This feature is included in the latest build.

来源：https://stackoverflow.com/questions/42982495/java-listen-to-websocket-messages-with-htmlunit

标签

java

websocket

htmlunit