Ping! will it make it into GWT 2.0? seems unlikely unfortunately, whereas the patch was "LGTM" three months ago :-(
I'm submitting an updated patch, just in case, as the tests were changed due to FF3.5 supporting CORS (i.e. not throwing an exception in the cross-origin test) http://gwt-code-reviews.appspot.com/61812 -- http://groups.google.com/group/Google-Web-Toolkit-Contributors
