Saves a state from context to cookie

        :type resp: satosa.response.Response
        :type context: satosa.context.Context

        :param resp: The response
        :param context: Session context

def _save_state(self, resp, context):
        """
        Saves a state from context to cookie

        :type resp: satosa.response.Response
        :type context: satosa.context.Context

        :param resp: The response
        :param context: Session context
        """

        cookie = state_to_cookie(context.state, self.config["COOKIE_STATE_NAME"], "/",
                                 self.config["STATE_ENCRYPTION_KEY"])
        resp.headers.append(tuple(cookie.output().split(": ", 1)))