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For example,
I have a nginx server as a front-end and two apache servers with mod_php.
As you know, php has sesssion support, which set a cookie identifying the SESSION ID but the real data is stored at the server.
When a user is set with this kind of cookie by one apache server, will his other HTTP requests be fowarded to the same apache server before the session/cookie expires ?
Out of the box, no, the requests will not necessarily be forwarded to the same server, so your application using sessions will be broken.
Go to your favorite search engine and type “nginx affinity” and “nginx sticky” for solutions.