public function addContent(string $content): \Symfony\Component\HttpFoundation\Response
    {
        return $this->setContent($this->getContent() . $content);
    }
public function addContent(string $content): \Symfony\Component\HttpFoundation\Response
    {
        return $this->setContent($this->getContent() . $content);
    }
public function addContent ( string $ content ) : \ Symfony \ Component \ HttpFoundation \ Response { return $ this -> setContent ( $ this -> getContent ( ) . $ content ) ; }
Add To Content

Add retrieved input to the end of already existing content in the
Response object.

@param string $content Content to be added.
@return \Symfony\Component\HttpFoundation\Response
Add To Content