What is a Middleware?

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  • The SessionMiddleware class is initialized with attributes of get_response HttpResponse object, engine module, SessionStore class got from the engine . By default, in Django SESSION_ENGINE is database backed.
  • process_request checks if there’s a cookie named sessionid in request.COOKIES dictionary. sessionid is a default value for settings.SESSION_COOKIE_NAME . request object’s session attribute is assigned SessionStore object , that was initialized in the class, with or without session_key .
  • process_response checks if we need to create, update or delete cookie with all possible scenarios based on whether SessionStore is empty; sessionid has already been accessed; or SessionStore has been modified.



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