title: iframe JSON response prompt download in IE
body: <p>Have an iframe where files are uploaded, and the iframe responds with a JSON response</p>
  <p>How is it possible to force IE not to prompt for download? Could it be done with some extra headers on the server side?</p>
  <h1>headers</h1>
  <pre><code>Array
  (
      [Host] =&gt; localhost:8080
      [User-Agent] =&gt; Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0
      [Accept] =&gt; text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
      [Accept-Language] =&gt; da,en-us;q=0.7,en;q=0.3
      [Accept-Encoding] =&gt; gzip, deflate
      [Referer] =&gt; http://localhost:8080/da/voucher/
      [Cookie] =&gt; session=192.168.1.36; PHPSESSID=54rbqritt9dmcpt82ujq2r0lk2
      [Connection] =&gt; keep-alive
      [Content-Type] =&gt; multipart/form-data; boundary=---------------------------143822985431828
      [Content-Length] =&gt; 7762362
  )
  </code></pre>