title: IFrame issue using google docs viewer
body: <p>I am trying to embed a PDF document using google docs viewer:</p>
  
  <pre><code>&lt;iframe src="http://docs.google.com/gview?url=MY_FILE_URL&amp;amp;embedded=true" style="border: none;" height="900" width="100%"&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p>and Its working fine, but when I try to refresh the page multiple times.. sometimes IFrame content does show up and some other times It doesn't,and I get an <strong>empty head and body</strong> inside "IFrame " tag </p>
  
  <ul>
  <li>tried to set expires to: 0</li>
  <li>tried to add random numbers: MY_FILE_URL?var=rand() to solve some
  cash issue</li>
  <li>tried to add IFrame using jquery on after page has loaded</li>
  </ul>
  
  <p>nothing seems to solve my problem..</p>