Why Session Tracking?
Session Tracking is amechanism to maintain state across a
series of requests from the same user (or
originating from the same browser) over
some period of time
Example: Online shopping cart
Yet, HTTP is stateless protocol
Each time, a client talks to a web server, it opens
a new connection
Server does not automatically maintains
“conversational state” of a user
Three “underlying” Session Tracking Mechanisms
Cookies
URL rewriting
Hidden form fields
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