How to use the djangorestframework.utils.mediatypes.is_form_media_type function in djangorestframework

def _perform_form_overloading(self):
        """
        If this is a form POST request, then we need to check if the method and
        content/content_type have been overridden by setting them in hidden
        form fields or not.
        """

        USE_FORM_OVERLOADING = (
            self._METHOD_PARAM or
            (self._CONTENT_PARAM and self._CONTENTTYPE_PARAM)
        )

        # We only need to use form overloading on form POST requests.
        if (not USE_FORM_OVERLOADING
            or self._request.method != 'POST'
            or not is_form_media_type(self._content_type)):
            return

        # At this point we're committed to parsing the request as form data.
        self._data = self._request.POST
        self._files = self._request.FILES

        # Method overloading - change the method and remove the param from the content.
        if (self._METHOD_PARAM and
            self._METHOD_PARAM in self._data):
            self._method = self._data[self._METHOD_PARAM].upper()
            self._data.pop(self._METHOD_PARAM)

        # Content overloading - modify the content type, and re-parse.
        if (self._CONTENT_PARAM and
            self._CONTENTTYPE_PARAM and
            self._CONTENT_PARAM in self._data and

def _perform_form_overloading(self):
        """
        If this is a form POST request, then we need to check if the method and content/content_type have been
        overridden by setting them in hidden form fields or not.
        """

        # We only need to use form overloading on form POST requests.
        if not self._USE_FORM_OVERLOADING or self._method != 'POST' or not is_form_media_type(self._content_type):
            return
        
        # At this point we're committed to parsing the request as form data.
        self._data = data = self.request.POST.copy()
        self._files = self.request.FILES

        # Method overloading - change the method and remove the param from the content.
        if self._METHOD_PARAM in data:
            # NOTE: unlike `get`, `pop` on a `QueryDict` seems to return a list of values.
            self._method = self._data.pop(self._METHOD_PARAM)[0].upper()

        # Content overloading - modify the content type, and re-parse.
        if self._CONTENT_PARAM in data and self._CONTENTTYPE_PARAM in data:
            self._content_type = self._data.pop(self._CONTENTTYPE_PARAM)[0]
            stream = StringIO(self._data.pop(self._CONTENT_PARAM)[0])
            (self._data, self._files) = self._parse(stream, self._content_type)