Absolute links on 404 error page

[Arming, Sebastian]

Hey,

I've setup a custom 404 error page in my web.xml which is generated by Tapestry.

As links generated by tapestry are (normally) relative, they don't work on a 
404 page for a path with several slashes.
That is if I navigate to (non existing) "/a/b", the browser interprets the link 
"contact" as pointing to "/a/contact/" instead of "/contact".

As a workaround I've put

void setupRender(){
      request.setAttribute(InternalConstants.GENERATING_RENDERED_PAGE, true);
}

into the error page.

Is there a way to achieve a similar outcome without using the internal api?

I don't want to redirect to the error page for usability (and probably HTTP 
standard) reasons.

Thanks,
Sebastian