public function &getRequest($requestClass = '')
    {
        if (!is_string($requestClass) || $requestClass === '') {
            $requestClass = $this->getConfig()->get('Request.class', null, 'Teleport\Request\CLIRequest');
        }
        if (!$this->request instanceof $requestClass) {
            $this->request = new $requestClass();
        }
        return $this->request;
    }