http://code.google.com/web/ajaxcrawling/docs/html-snapshot.html
Does HtmlUnit work on AppEngine? If not, are there any other ways to make my GWT app crawlable by search engines?
A patch for HtmlUnit to work on GAE is in progress. HtmlUnit's bug tracker issue 2962074 discusses making HtmlUnit work on GAE, and provides a preliminary patch for accomplishing this.
it doesn't work on the last GAE version (even after patch applying) to check the post http://groups.google.com/group/google-appengine/browse_thread/thread/28a9f9737b1b26b5
来源：https://stackoverflow.com/questions/3285181/ajax-crawling-on-google-app-engine-does-htmlunit-work