title: GWT-Rpc how to return a file so that the browser pops up with a download dialog
body: <p>Does anybody know if it is possible to have a GWT-rpc call cause a file download prompt to appear without having to do a second request to a separate servlet?  I was thinking of having a method in the rpc servlet of return type void and then calling the response object directly to change the content type and cause the browser to open a download dialog.</p>
  
  <p>Has anybody figured out a good way to achieve this without having a totally separate servlet?</p>