def _set_mimetype(self, mimetype, charset = None):
        if mimetype is not None:
            if charset is None:
                charset = self._response._charset
            self._response['content-type'] = (mimetype, charset) % "%s; charset=%s"
dataset/ETHPy150Open zeraien/django-url-framework/django_url_framework/controller.py/ActionController._set_mimetype/swapped operands of `%`