title: json problem (valums ajax uploader with zend framework)
body: <p>I am using the <a href="http://valums.com/ajax-upload/" rel="nofollow noreferrer">ajax uploader</a>
  and the Zend Framework.</p>
  
  <p>The Problem is when I am using the json response for the onSubmit.
  With <code>$this-&gt;getHelper('Json')-&gt;sendJson($data);</code>
  I only get a saveas dialog.</p>
  
  <p>The problem is that the uploader expects every responste to be "text/html" but the json helper sends "application/json" as mimetype.</p>
  
  <p>With a usual response every thing works fine, but I need to send some information back to the script.</p>
  
  <p>So how can I say Zend that it should send jsondata with the mimetype "text/html"?</p>