Re: Can you tell me Step-By-Step Guidelines of How to use HtmlUnit to make GWT app Crawlable?

Ok, here is the problem of HTMLUnit. 

I have this code

 url_with_hash_fragment="http://127.0.0.1:8888/Myproject.html?gwt.codesvr=127.0.0.1:9997#!home";
         // use the headless browser to obtain an HTML snapshot
         final WebClient webClient = new WebClient();
         HtmlPage page = webClient.getPage(url_with_hash_fragment);


         // important!  Give the headless browser enough time to execute JavaScript
         // The exact time to wait may depend on your application.
         webClient.waitForBackgroundJavaScript(2000);


         // return the snapshot
         PrintWriter out = response.getWriter();
         out.println(page.asXml());

in my eclipse, it first listed css clode like:

gwt-ToggleButton-down {
  background-position: 0 -513px;
  border: 1px inset #ccc;
  cursor: pointer;
  cursor: hand;
}
.gwt-ToggleButton-down-hovering {
  background-position: 0 -513px;
  border: 1px inset;
  border-color: #9cf #69e #69e #7af;
  cursor: pointer;
  cursor: hand;
}....

: null

java.util.EmptyStackException

at java.util.Stack.peek(Unknown Source)

Why we got EmptyStackException problem?

If I run http://127.0.0.1:8888/Myproject.html?gwt.codesvr=127.0.0.1:9997#!home without HTMLUnit then everything is fine no issue, but if i run that url under HTMLUnit  then I got  EmptyStackException

How can sure 100% that HtmlUnit will never generate any error for any kind of HTML code?

On Friday, May 16, 2014 12:06:24 AM UTC+10, Jens wrote: 

HtmlUnit is bundles as jar file so you can put it (and all its dependencies) into WEB-INF/lib of your war.

Then you need to write a servlet that takes the server request of the Google bot, rewrites the _escaped_fragment_ parameter back to the original #!<token> url and starts HtmlUnit with that url. The resulting/rendered page will then be returned by the servlet.

At the bottom is an example:

https://developers.google.com/webmasters/ajax-crawling/docs/html-snapshot

The rendered page that you serve the Google Bot does not have to be a 1:1 copy of your original page. It is enough if the same content is available, styling is irrelevant. For example compare:

https://groups.google.com/forum/#!topic/google-web-toolkit/Syi04ArKl4k

https://groups.google.com/forum/?_escaped_fragment_=topic/google-web-toolkit/Syi04ArKl4k

-- J.

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