Flask LED
This is a simple web application using Flask to turn an LED (or anything else) on and off on a Raspberry PI.
It uses many libraries and technologies namely flask, flask_wtf, flask bootstrap, jinja2, ajax calls in javascript and many more. The view has CSRF protection.
Hardware connection
connect an LED to the 40th pin through a 330 ohm resistor to ground.
Running as a service
Please consider this gist for more information.