def _not_authenticated(self):
        """
        Return a three-tuple of (authenticator, user, authtoken), representing
        an unauthenticated request.

        By default this will be (None, AnonymousUser, None).
        """
        self._authenticator = None

        if api_settings.UNAUTHENTICATED_USER:
            self.user = api_settings.UNAUTHENTICATED_USER()
        else:
            self.user = None

        if api_settings.UNAUTHENTICATED_TOKEN:
            self.auth = api_settings.UNAUTHENTICATED_TOKEN()
        else:
            self.auth = None
Return a three-tuple of (authenticator, user, authtoken), representing
        an unauthenticated request.

        By default this will be (None, AnonymousUser, None).