private static function doRequest($url, $headers = [])
    {
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
        curl_setopt($ch, CURLOPT_HEADER, false);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        $response = curl_exec($ch);
        if (0 !== $errno = curl_errno($ch)) {
            $errorMessage = curl_strerror($errno);
            Yii::$app->session->setFlash("cURL error ({$errno}):\n {$errorMessage}");
        }
        curl_close($ch);
        return $response;
    }