AppserverIo\Appserver\Core\Api\AbstractService::getServerSignature PHP Method

    public function getServerSignature()
    {
        // try to load the OS identifier
        list($os, ) = sscanf(strtolower(php_uname('s')), '%s %s');
        // check if we've a file with the actual version number
        if (file_exists($filename = $this->getConfDir('/.release-version'))) {
            $version = file_get_contents($filename);
        } else {
            $version = 'dev-' . gethostname();
        }
        // prepare and return the server signature
        return sprintf('appserver/%s (%s) PHP/%s', $version, $os, PHP_VERSION);
    }