code: def token(self):
          
          if self._token is None:
              token_type = os.getenv(TOKEN_TYPE_KEY, '')
              token_body = os.getenv(TOKEN_BODY_KEY, '')
              self._token = _Token(token_type, token_body)
          return self._token
docs: Returns authorization token provided by Cocaine.
  
          The real meaning of the token is determined by its type. For example OAUTH2 token will
          have "bearer" type.
  
          :return: A tuple of token type and body.