public static function csrfMetaTags()
{
$request = Yii::$app->getRequest();
if ($request instanceof Request && $request->enableCsrfValidation) {
return static::tag('meta', '', ['name' => 'csrf-param', 'content' => $request->csrfParam]) . "\n " . static::tag('meta', '', ['name' => 'csrf-token', 'content' => $request->getCsrfToken()]) . "\n";
} else {
return '';
}
}