Does SessionID change with every request in the asp.net application?
No, the SessionID does not typically change with every request in an ASP.NET application. The SessionID is a unique identifier generated by the server and assigned to a user's session when it is first created. It is used to associate subsequent requests from the same client with the same session.
By default, ASP.NET uses a session cookie named "ASP.NET_SessionId" to store and transmit the SessionID between the client and the server. The SessionID is sent by the client in the HTTP request header, allowing the server to identify and retrieve the correct session.
Once a session is established, the SessionID remains the same for subsequent requests from the same client until the session expires or is explicitly abandoned. The SessionID is typically stored in a cookie on the client-side, and as long as the cookie is not deleted or modified, the SessionID remains unchanged.
However, there are scenarios where the SessionID can change:
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Session timeout or expiration:
When a session times out or expires due to inactivity or a predefined duration, the SessionID becomes invalid. The next request from the client will initiate a new session with a new SessionID.
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Abandoning the session:
If the session is explicitly abandoned by calling the 'Session.Abandon()' method, the current SessionID becomes invalid. The subsequent request from the client will create a new session with a new SessionID.
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Session fixation protection:
ASP.NET includes session fixation protection mechanisms that can change the SessionID during the authentication process to mitigate potential security risks. This helps ensure that the SessionID is not susceptible to session fixation attacks.
In most cases, the SessionID remains the same throughout a user's browsing session as long as the session is active and the session cookie is preserved. However, it's important to handle scenarios where the SessionID may change due to session expiration, abandonment, or other security considerations.