Why is the GetSession function in gin-contrib/sessions returning a token that is nil?

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There are several reasons why the GetSession function in gin-contrib/sessions may return a token that is nil:

1. Session storage is not properly configured: The GetSession function relies on the session storage mechanism to retrieve the session data. If the session storage is not properly configured, it may return a nil token.

2. Session data has expired: Session data may have an expiration time after which it becomes invalid. If the session data has expired, the GetSession function may return a nil token.

3. Invalid or missing session information: If the session information is invalid or missing, the GetSession function may fail to retrieve the session data and return a nil token.

4. Session middleware is not properly added: In order to use the GetSession function, the session middleware needs to be properly added to the Gin engine. If the middleware is not properly added, the GetSession function may not be able to retrieve the session data and return a nil token.

5. Incorrect usage of the function: The GetSession function needs to be used in the correct way in order to retrieve the session data properly. If it is called with incorrect parameters or used incorrectly, it may return a nil token.