What is the best way for server-side controllers to manage multiple client sessions?

Having a background in JavaScript, I have recently delved into server-side development. From my current understanding, it seems that controllers on the server-side follow a 1 to many ratio in terms of client-side interactions.

https://i.sstatic.net/HWEQn.png

My focus is on a login functionality where:

@expose('/login/', methods=('GET', 'POST'))
    def login_view(self):
        if request.method == 'GET':
            # Render template
        if request.method == 'POST':
            # Retrieve email and password from form, verify user existence,
            # and log them in.
            login.login_user(user)

            # Store user_id in session for socketio use
            session['user_id'] = login.current_user.id

            # Redirect

I see the session dictionary as the Python equivalent of localStorage in JavaScript. Does this imply that each unique client has its own controller? If not, wouldn't multiple clients sharing the same controller overwrite the session.user_id?

Answer №1

After a user successfully authenticates, a session is created and the state is stored on the client side in a cookie.

When a user logs in with their email and password, the server verifies these credentials by checking against the database. If validated, the server generates a token and sets it along with a possible expiration time in the cookie of the response. Subsequently, any HTTP requests from that specific client will include this token for identification purposes by the server.

In essence, each session is managed at the client side while being authenticated for validity by the server.

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