after_response.py

"""Run some code after the response is returned to the user in django
Great for analytics or other slow tasks that you don't want to block the response
to the user for.
"""

class HttpResponseWithCallback(HttpResponse):
    def __init__(self, *args, **kwargs):
        self.callback = kwargs.pop('callback')
        super().__init__(*args, **kwargs)

    def close(self):
        super().close()
        self.callback(response=self)


def my_view(request):
    ...
    return HttpResponseWithCallback(..., callback=some_expensive_function)

# can also easily be put on a class-based view as a View.after_response method