Piwik\Plugins\UserCountry\LocationProvider\GeoIp\ServerBased::isWorking PHP Method

    public function isWorking()
    {
        if (empty($_SERVER[self::TEST_SERVER_VAR]) && empty($_SERVER[self::TEST_SERVER_VAR_ALT]) && empty($_SERVER[self::TEST_SERVER_VAR_ALT_IPV6])) {
            return Piwik::translate("UserCountry_CannotFindGeoIPServerVar", self::TEST_SERVER_VAR . ' $_SERVER');
        }
        return true;
        // can't check for another IP
    }