As a generic suggestion (that works for the majority of situations, on
the majority of browsers) you are looking for something like:
Pragma: No-cache
Cache-control: no-cache, no-store, private, must-revalidate, max-age=0
Expires: 0
This won't stop the back button working, but it will suggest to the
browser that it should read the content from the site again, not simply
redisplay it from the cache. The acid test of whatever measures you use
is to use ethereal or a MITM proxy to see what is actually requested by
the browser, and when. Also, open your local cache directory and see
what the browser is really storing to disk...
Martin...
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