/**
     * @param \Kdyby\Curl\CurlWrapper $curl
     * @return string
     */
    public static function convertEncoding(CurlWrapper $curl)
    {
        if (Strings::checkEncoding($response = $curl->response)) {
            return Strings::normalize($response);
        }

        if ($charset = static::charsetFromContentType($curl->info['content_type'])) {
            $response = @iconv($charset, 'UTF-8', $response);

        } else {
            if ($contentType = Strings::match($response, '~<(?P<el>meta[^>]+Content-Type[^>]+)>~i')) {
                foreach (Nette\Utils\Html::el($contentType['el'])->attrs as $attr => $value) {
                    if (strtolower($attr) !== 'content') {
                        continue;
                    }

                    if ($charset = static::charsetFromContentType($value)) {
                        $response = @iconv($charset, 'UTF-8', $response);
                        $response = static::fixContentTypeMeta($response);
                        break;
                    }
                }

            }
        }

        return Strings::normalize($response);
    }