Solve the post-session problem of Application server cluster

I. What is a session?

Users use the site's services, basically need the browser and the Web server to do multiple interactions, how the Web server know which requests are from which session?

The method is: At the beginning of the session, assign a unique session ID (SESSIONID), through the cookie to tell the browser, the next time each request, the browser will bring this session ID to tell the Web server request belongs to which session. If a cookie is disabled, it is common practice to place the session ID in the URL's parameters.

Solve the post-session problem of Application server cluster