Extbase additional Header Metatags

NewsController.php

/**
  * Add dynmic metatags to response header in Extbase
  *
  * @param News $news
  * @return void
*/
protected function addMetaDataToHeader(News $news){
  $this->response->addAdditionalHeaderData('<meta property="og:title" content="'. htmlspecialchars($news->getTitle()).'"/>');
  $this->response->addAdditionalHeaderData('<meta name="description" content="'. htmlspecialchars($news->getTeaserText()) .'">');
  $this->response->addAdditionalHeaderData('<meta name="author" content="'.$author.'">');
  $this->response->addAdditionalHeaderData('<meta property="og:author" content="'.$author.'">');
  $this->response->addAdditionalHeaderData('<meta name="keywords" content="'.$keywordList.'" />');
  $this->response->addAdditionalHeaderData('<meta property="og:type" content="article" />');
  $this->response->addAdditionalHeaderData('<!-- news meta -->');
}