public function getContent(string $url): string
    {
        if (false === filter_var($url, FILTER_VALIDATE_URL)) {
            throw new InvalidArgument(
                sprintf('"%s" must be called with a valid url. Got "%s" instead.', __METHOD__, $url)
            );
        }

        $ipAddress = parse_url($url, PHP_URL_QUERY);

        if (false === filter_var($ipAddress, FILTER_VALIDATE_IP)) {
            throw new InvalidArgument('URL must contain a valid query-string (an IP address, 127.0.0.1 for instance)');
        }

        $result = $this->geoIp2Provider
            ->{$this->geoIP2Model}($ipAddress)
            ->jsonSerialize();

        return json_encode($result);
    }