Airline#getTCPAddress

/**
     * Gets the TCP Address of this Airline
     *
     * @param ports
     *            Last port is default port
     * @param serverUrl
     *            Url on the server
     * @return The TCP Adress
     */
    private String getTCPAddress(String serverUrl, int... ports) {
        String ip = "127.0.0.1";
        try {
            Enumeration<NetworkInterface> nis = NetworkInterface
                    .getNetworkInterfaces();
            while (nis.hasMoreElements()) {
                NetworkInterface next = nis.nextElement();
                Enumeration<InetAddress> add = next.getInetAddresses();
                while (add.hasMoreElements()) {
                    InetAddress address = add.nextElement();
                    if (!address.isAnyLocalAddress()) {
                        if (address instanceof Inet4Address) {
                            String baseIp = ip = address.getHostAddress();
                            if (!"127.0.0.1".equals(ip)) {
                                // Guess port
                                URL url;
                                for (int p : ports) {
                                    url = new URL("http", baseIp, p, serverUrl);
                                    ip = baseIp + ':' + p;
                                    if (isAvailable(url)) {
                                        return ip;
                                    }
                                }
                                return ip;
                            }
                        }
                    }
                }
            }
            return ip;
        } catch (SocketException | MalformedURLException e) {
            return ip;
        }
    }
    private static int timeout = 3000;

    private boolean isAvailable(URL url) {
        try {
            HttpURLConnection connection = (HttpURLConnection) url
                    .openConnection();
            connection.setConnectTimeout(timeout);
            connection.setReadTimeout(timeout);
            connection.setRequestMethod("GET");
            connection.connect();
            int code = connection.getResponseCode();
            return code == HttpURLConnection.HTTP_OK;
        } catch (Exception e) {
            return false;
        }

    }