GWT Ajax crawling : ?_escaped_fragment_=subpage | subpage is ignored

I successfully made my gwt app crawlable following the official Google
guide at https://developers.google.com/webmasters/ajax-crawling/

Now, I got a startpage that is invoked with the historytoken #!
Startpage and I got a contact form that is invoked by #!Contact.

Here is my on module load function:

public void onModuleLoad() {

// I commented this so that I get an empty inital window
//RootPanel.get("application_div").add( new StartWidget() );

//do some stuff and add history support

History.newItem( History.getToken() );
}

Now, if I call my page like this

http://localhost:8080

I get an empty page, as expected! But when calling the page like this

http://localhost:8080#!Startpage

I get the startpage. And with

http://localhost:8080/#!Contact

I get the contact form. So I checked that this works.

Now to the crawling part:
I installed a servlet filter in my tomcat and use this code

http://code.google.com/p/gwt-platform/source/browse/src/com/philbeaudoin/gwtp/crawler/server/CrawlFilter.java?r=6e633296934feb9d8150f53b07b8b9515ea6dc4b

as the filter object. It uses htmlunit to render the page on server
side and then it sends pure html to the client. This works as follows:

http://localhost:8080/?_escaped_fragment_=Contact

The _escaped_fragment_ invokes the htmlunit part in the filter object
and the page gets rendered as described in the offical Google guide
ajax crawling document: https://developers.google.com/webmasters/ajax-crawling/

The problem is that

http://localhost:8080/?_escaped_fragment_=Contact

yields a empty page just as if there was no history token. This means
that the htmlunit in the code completly ignores the history token and
just loads an empty page.

What is going wrong and why does htmlunit not invoke the history?

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