yii\httpclient\Response::getData PHP Method

    public function getData()
    {
        $data = parent::getData();
        if ($data === null) {
            $content = $this->getContent();
            if (!empty($content)) {
                $data = $this->getParser()->parse($this);
                $this->setData($data);
            }
        }
        return $data;
    }