How to generate a secret key with Python. GitHub Gist: instantly share code, notes, and snippets. The only real difference between cookies and the client-based session is that Flask guarantees that the contents of the session cookie is not tempered by the user (unless he has the secret key). If you want to use server-side sessions in Flask, you can either write your own session interface or use extensions like Flask-Session and Flask-KVSession.
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Like Cookie, Session data is stored on client. Session is the time interval when a client logs into a server and logs out of it. The data, which is needed to be held across this session, is stored in the client browser.
A session with each client is assigned a Session ID. The Session data is stored on top of cookies and the server signs them cryptographically. For this encryption, a Flask application needs a defined SECRET_KEY.
Session object is also a dictionary object containing key-value pairs of session variables and associated values.
For example, to set a ‘username’ session variable use the statement −
To release a session variable use pop() method.
Flask Session Type
The following code is a simple demonstration of session works in Flask. URL ‘/’ simply prompts user to log in, as session variable ‘username’ is not set.
As user browses to ‘/login’ the login() view function, because it is called through GET method, opens up a login form.
A Form is posted back to ‘/login’ and now session variable is set. Application is redirected to ‘/’. This time session variable ‘username’ is found.
The application also contains a logout() view function, which pops out ‘username’ session variable. Hence, ‘/’ URL again shows the opening page.
Run the application and visit the homepage. (Ensure to set secret_key of the application)
The output will be displayed as shown below. Click the link “click here to log in”. Mac generate 4096 ssh key.
The link will be directed to another screen. Type ‘admin’.
The screen will show you the message, ‘Logged in as admin’.