docs: public base_response loginchallengeresponse(String response) throws Exception
  	{
  		loginchallengeresponse logincr = new loginchallengeresponse(response);
  		base_response result = logincr.perform_operation(this);
  		if (result.errorcode == 0)
  			this.sessionid = result.sessionid;
  		return result;
  	}