'headers' argument for test RequestFactory/Client

[Adam Johnson]

We have request.headers since Django 2.2, but RequestFactory, and thus Client, still require using the awkward meta syntax for setting headers:

self.client.get("/", HTTP_ACCEPT_LANGUAGE="en")

I propose we add support for a headers argument that takes a dictionary like request.headers:

self.client.get("/", headers={"accept-language": "en"})

This would make tests easier to read and write, since they’d be consistent with HttpRequest.

(If this is accepted and merged, open a ​django-upgrade issue to rewrite request factory and client invocations.)

[Mariusz Felisiak]

Sounds good.

[David Wobrock]

I agree that it would come in handy!

Here's a ​draft PR.

[Mariusz Felisiak <felisiak.mariusz@…>]

In 67da22f:

Fixed #34074 -- Added headers argument to RequestFactory and Client classes.

[Mariusz Felisiak <felisiak.mariusz@…>]

In 99bd5fb4:

Refs #34074 -- Used headers argument for RequestFactory and Client in docs and tests.