Django 3.1 deprecated request.is_ajax()

[bockstaller]

Hi there,

Running the tests on one of my projects with the beeline enabled resulted in this little gem:
[...]/venv/lib/python3.8/site-packages/beeline/middleware/django/__init__.py:100: RemovedInDjango40Warning: request.is_ajax() is deprecated. See Django 3.1 release notes for more details about this deprecation. "request.xhr": request.is_ajax(),

Citing from the release notes:

"The HttpRequest.is_ajax() method is deprecated as it relied on a jQuery-specific way of signifying AJAX calls, while current usage tends to use the JavaScript Fetch API. Depending on your use case, you can either write your own AJAX detection method, or use the new HttpRequest.accepts() method if your code depends on the client Accept HTTP header."

It will be removed with Django 4.0, so there is plenty of time to make the necessary changes. I just wanted to put in on your radar.
I am not actively using this field myself and am only starting out with Django. So I didn't prepare a pull request, because I've no clue what's the expected behaviour.

[gtwohig]

@vreynolds You can close this one as you merged the fix 😃