We will restrict our AJAX views to allow only requests generated via AJAX. The Django request object provides an is_ajax() method that checks whether the request is being made with XMLHttpRequest, which means it is an AJAX request. This value is set in the HTTP_X_REQUESTED_WITH HTTP header, which is included in AJAX requests by most JavaScript libraries.
We will create a decorator for checking the HTTP_X_REQUESTED_WITH header in our views. A decorator is a function that takes another function and extends the behavior of the latter without explicitly modifying it. If the concept of decorators is foreign to you, you might like to take a look at https://www.python.org/dev/peps/pep-0318/ before you continue reading.
Since our decorator will be generic and could be applied to any view, we will create a common Python package in our project....
