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Why is HTTP protocol called as a stateless protocol?

HTTP protocol is called a stateless protocol because each command is executed independently, without any information of the commands that came before it. 

The server does`t hold the state of the multiple client request. This is the main reason that it is difficult to implement Web sites that react intelligently to user input. This shortcoming of HTTP is being addressed and improved in a number of new technologies like.

HTTP cookies.
server side sessions.
hidden variables (when the current page contains a form).

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