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https://github.com/python/typeshed/pull/7773 changed `requests.session.Session` methods to accept None for header values, but didn't do quite the same for the functions in `requests.api`. I think this was a mistake. The functions in `requests.api` just pass through the `headers` argument without doing anything in particular to it. Furthermore, it's useful to be able to pass None as a header value: because `requests.utils.default_headers` sets an `Accept-Encoding` header by default, the easiest way to send a request with no `Accept-Encoding` header is something like `requests.get(url, headers={"Accept-Encoding": None})`. It's annoying to have to construct a `Session` just to pass type-checking. It's a little confusing for the type alias to be called `_HeadersUpdateMapping` in `requests.sessions` but `_HeadersMapping` in `requests.api`; this is because the latter name was already used in other type stubs (`tensorflow.keras.callbacks`), so it seemed best to avoid breaking API.