protected function nocache()
{
// headers apropriados para evitar caching
Manager::$response->setHeader('Expires', 'Expires: Fri, 14 Mar 1980 20:53:00 GMT');
Manager::$response->setHeader('Last-Modified', 'Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
Manager::$response->setHeader('Cache-Control', 'Cache-Control: no-cache, must-revalidate');
Manager::$response->setHeader('Pragma', 'Pragma: no-cache');
Manager::$response->setHeader('X-Powered-By', 'X-Powered-By: ' . Manager::version() . '/PHP ' . phpversion());
}
