after logout using back button is letting it use the flask application

After a user logs out of a Flask application, they should not be able to continue using the application by clicking the back button. This behavior can be prevented by implementing certain steps:

1. Implement a logout route: In your Flask application, create a route specifically for logging out. This route should handle any necessary logic, such as clearing session data or revoking authentication tokens.

2. Clear session data: Once the user clicks the logout button, you should clear any session data associated with their session. This prevents the user from being able to access any protected routes or perform any actions that require authentication.

3. Redirect to a different page: After clearing the session data, you should redirect the user to a different page, such as a login page or a home page. This ensures that even if the user tries to go back using the back button, they won't be able to access any restricted content.

4. Use caching headers: To further prevent the user from accessing restricted content after logging out, you can set caching headers in the response to instruct the browser not to cache any pages that require authentication. This ensures that even if the user tries to access a cached page, they will be redirected to the appropriate page.

By following these steps, you can ensure that logging out of a Flask application prevents users from continuing to use the application by using the back button.