obtain free server port:
int freeServerPort = Net.freeServerPort();obtain free server port for any host address:
int freeServerPort = Net.freeServerPort(hostAddress);is localhost an IPv6 address:
boolean isIpv6 = Net.localhostIsIPv6();create SSLContext to accept any SSL certificate:
HttpsURLConnection connection = (HttpsURLConnection) URLConnections.urlConnectionOf(httpsUrl);
connection.setSSLSocketFactory(Net.acceptAllSSLContext().getSocketFactory());