Use decorator syntax for csrf_exempt example.

    from django.views.decorators.csrf import csrf_exempt

    @csrf_exempt

    def my_view(request):

        return HttpResponse('Hello world')

    my_view = csrf_exempt(my_view)

Like the middleware, the ``csrf_exempt`` decorator is composed of two parts: a

``csrf_view_exempt`` decorator and a ``csrf_response_exempt`` decorator, found