DanTMan wrote:
That's not what I'm talking about. Disable caching on the frontend caching device when the user is logged in. Your frontend cache is basically the same as Squid and Varnish. You have to disable them for users because those kind of caches can never cache user data right. I believe Wikimedia does this by having the frontend cache check for the user cookie.
It's stated on the Vary: header Vary: Accept-Encoding,Cookie
Furthermore, the exact cookies are statet at X-Vary-Options: but i think few caching devices would understand it.