protected function _url() {
		if (isset($this->_config['url'])) {
			return rtrim($this->_config['url'], '/');
		}
		if (!empty($_GET['url']) ) {
			return rtrim($_GET['url'], '/');
		}
		if ($uri = $this->env('REQUEST_URI')) {
			return trim(preg_replace(
				'/^' . preg_quote($this->env('base'), '/') . '/', '', parse_url($uri, PHP_URL_PATH)
			), '/') ?: '/';
		}
		return '/';
	}