| protected setHttpHeaders ( ) |
protected function setHttpHeaders()
{
Yii::$app->getResponse()->getHeaders()->set('Pragma', 'public')->set('Expires', '0')->set('Cache-Control', 'must-revalidate, post-check=0, pre-check=0')->set('Content-Transfer-Encoding', 'binary')->set('Content-type', 'image/png');
}