Flask Request Methods: Practical Handling of GET and POST Requests

This article introduces the lightweight Python Web framework Flask and HTTP request methods GET/POST. Flask is suitable for rapid development of web applications, with the installation command being `pip install flask`. GET is used to retrieve data (data is in the URL and easily leaked), while POST is used to submit data (data is in the request body and more secure). In practice, handling a login form with Flask: define the `/login` route to support GET/POST, where GET renders the form template and POST retrieves the username and password for verification and returns the result. Key knowledge points: the `methods` parameter of the route supports multiple request methods, `request.form` extracts form data, and `render_template` renders templates. Notes: Only POST requires changing `methods=['POST']`, sensitive data should use POST and HTTPS is recommended, and CSRF protection is necessary in production environments.