Challenge: Create a Login and Logout Mechanism
Explore how to implement user login and logout mechanisms in Flask by managing sessions securely with cryptographically signed cookies. Understand how to use Flask's session proxy for state persistence, execute absolute redirects, and conditionally render navigation links based on authenticated users within templates.
We'll cover the following...
HTTP network data transactions operate natively as stateless connections. This means that a web server treats each inbound request as an isolated transaction, completely disconnected from any previous request. If a user logs into our platform and then navigates to another page, a stateless server instantly forgets who they are. To build a continuous user experience, we must learn two new foundational state-management concepts: sessions and redirects.
Understanding Flask sessions
To remember a user across multiple requests, we use a global state tracking object named session. Flask sessions save identity details directly inside cryptographically signed browser cookies. The ...