Just return text/html, as recommended in the JavaDoc (and don't forget
to use < for < and & for &)
I actually got my base implementation for the file uploader from the
Google Web Toolkit Solutions book, and he called the issue a bug. ( I
think that his book was written against GWT 1.3 ) I just assumed that
it'd never been fixed. But i guess it was probably never a GWT bug.
http://www.amazon.com/Google-Web-Toolkit-Solutions-Useful/dp/0132344815
Trevis