public function _redirect($url, $code = 303)
{
$base = $this->get('flight.base_url');
if ($base === null) {
$base = $this->request()->base;
}
// Append base url to redirect url
if ($base != '/' && strpos($url, '://') === false) {
$url = $base . preg_replace('#/+#', '/', '/' . $url);
}
$this->response(false)->status($code)->header('Location', $url)->write($url)->send();
}