
* Allow 'pipes' (or 'sinks') to allow other tags (or scriptlets) to 
  process the output of the request and possibly provide the input.

* Handle multi-part posts to allow easy posting of files or resources.
  For example:-
  
  <http:request url="http://www.foo.com/upload" action="POST">  
    <http:file name="bar.txt" uri="/xml/bar.xml"/>
  </http:request>

