HTTP Methods in Flask

The hypertext transfer protocol (HTTP) is a way for a web application to respond to requests.

There are four HTTP methods that you’ll typically find in introductory material:

• GET
• POST
• PUT
• DELETE

In this post we’ll provide a simple example. We will embed the following video

when GET is used. If the method is POST, then the page will render "POST". Otheriwse the function implicitly returns None, which offhand I don’t think does much of anything.

import getpass

from flask import Flask, request

app = Flask(__name__)

@app.route('/automorphisms', methods=['GET', 'POST'])
def http_methods_example():
    if request.method == 'GET':
        return '<iframe width="560" height="315" src="https://www.youtube.com/embed/vY1UkCPSKH8?si=mRB5eM30UmTUVfhv" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>'
    if request.method == 'POST':
        return 'POST'
    # We don't need to bother with PUT and DELETE

if __name__ == '__main__':
    app.run(debug=True)

Other than taking the parameter methods in app.route, there isn’t much to this application. We’re showing a tag for an embedded video, which for us to render only involves returning a string of the tag.