protected function _basic($request) {
		$users = $this->_config['users'];
		$username = $request->env('PHP_AUTH_USER');
		$password = $request->env('PHP_AUTH_PW');

		if (!isset($users[$username]) || $users[$username] !== $password) {
			$this->_writeHeader("WWW-Authenticate: Basic realm=\"{$this->_config['realm']}\"");
			return;
		}
		return compact('username', 'password');
	}