How can I make an HTTP request with no Content-Type header using django.test.Client?

I have a Django application which must have the following behavior: if a request has no Content-Type header, it returns an error response.

In order to test this behavior, I need to make an HTTP request without a Content-Type header.

I am using the Client class in the django.test module. This has many methods, including this one:

post(path, data=None, content_type=MULTIPART_CONTENT, follow=False, secure=False, **extra)

Makes a POST request on the provided path and returns a Response object, which is documented below.

[...]

If you provide content_type (e.g. text/xml for an XML payload), the contents of data will be sent as-is in the POST request, using content_type in the HTTP Content-Type header.

If you don’t provide a value for content_type, the values in data will be transmitted with a content type of multipart/form-data. In this case, the key-value pairs in data will be encoded as a multipart message and used to create the POST data payload.

The documentation says that a Content-Type header is always set on the request, irrespective of whether I pass a content_type argument.

So what other ways do I have to construct a request, such that it does not have a Content-Type header?