HTTP Session State
HTTP is a stateless protocol. A stateless protocol does not require the HTTP server to retain information or status about each user for the duration of multiple requests. However, some web applications implement states or server side sessions using one or more of the following methods:
- HTTP cookies.
- Query string parameters, for example, /index.php?session_id=some_unique_session_code.
- Hidden variables within web forms.
Read more about this topic: Hypertext Transfer Protocol
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