yii\httpclient\Response::getCookies PHP Method

    public function getCookies()
    {
        $cookieCollection = parent::getCookies();
        if ($cookieCollection->getCount() === 0 && $this->getHeaders()->has('set-cookie')) {
            $cookieStrings = $this->getHeaders()->get('set-cookie', [], false);
            foreach ($cookieStrings as $cookieString) {
                $cookieCollection->add($this->parseCookie($cookieString));
            }
        }
        return $cookieCollection;
    }