def save_session(self, request=None, response=None):
if not self._session_key:<EOL><INDENT>return<EOL><DEDENT>if self._session_data is None:  <EOL><INDENT>self.client.delete(self._session_key)<EOL>return<EOL><DEDENT>self.client.set(self._session_key, self._session_data)<EOL>
Save the session in the key value store, in case a session
        has been found