title: edge caching secure content on google app engine
body: <p>In my app, I have to serve huge secure files ( svg drawings etc ) that I want to show only to logged in user. File do not change much, and if it does, It do have different url, so I would like to use edge cache on google app engine for faster loading to already logged in user.</p>
  
  <p>My question is, how do I make it secure ? i.e. if the user logged out and if someone else use his browser can he see that content ? if so, how do I prevent it ?</p>
  
  <p>Related: How do I prevent browser from remembering a url of a content on my website. </p>