title: Browser displaying cached files instead of redirecting
body: <p>I have a problem with AppCache.</p>
  
  <p>The problem is this.
  I have a site that is cached, which requires a VPN connection or a 3rd party login to access. 
  If you enter the site while on VPN everything works fine.</p>
  
  <p>However, if you access the site without being on VPN you are supposed to be redirected to the 3rd party login page, but instead the browser shows a half broken page of cached files.</p>
  
  <p>If I load the page without VPN in Incognito mode then the 3rd party login page is shows just fine. </p>
  
  <p>Has anyone solved this before? Any idea how to redirect to the login page instead of showing what is cached?</p>