title: Managing sessions between different servers
body: <p>How are session of same user maintained when a load balancer is used with different web servers at backend . In other words lets suppose there is a load balancer to distribute load between different servers and a user is directed to one server where its session is stored and then next time the same user is directed to second server. How does servers know if it is same user ? how to maintain it that it was the same user on both servers</p>