Class HttpResponseNotModified

django/http/response.py:681–694

class HttpResponseNotModified(HttpResponse):
    status_code = 304

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        del self["content-type"]

    @HttpResponse.content.setter
    def content(self, value):
        if value:
            raise AttributeError(
                "You cannot set content to a 304 (Not Modified) response"
            )
        self._container = []


class HttpResponseBadRequest(HttpResponse):