title: How to avoid Internet Explorer's "Webpage has expired" when using the back button with an app inside a Page Tab?
body: <p>I've built a Facebook canvas app, which has been added as a Page Tab. In Internet Explorer, when I click a link from the homepage of the page tab to another page, and then press the browser back button, I get a message from IE:</p>
  
  <blockquote>
    <p>Webpage has expired
    Most likely cause: The local copy of this webpage is out of date, and the website requires that you download it again.</p>
  </blockquote>
  
  <p>If I press refresh then the page displays correctly, but I'd like to be avoid this extra step. </p>
  
  <p>Here's the link to the app:
  <a href="https://www.facebook.com/FindAnyFilm/app_324458010982848" rel="nofollow">https://www.facebook.com/FindAnyFilm/app_324458010982848</a></p>
  
  <p>Click on one of the latest entries, then press the browser back button.</p>