html - easiest way to prevent the back button of your browser from showing secure data after a user logs out?

Question

In a normal web app w/ login and secure data, what is an easy way to secure that data and prevent it from being seen by using the browser's back button, once a user logs out?

Answer 1

Here's a useful browser caching guide.

You want to set the cache-control and expiration date headers (setting a date in the past), e.g.

 Cache-Control: no-cache
 Expires: Fri, 31 Dec 1998 12:00:00 GMT