Register a priviledged port or a domain address on the NodeOS reverse proxy
nodeos-reverse-proxy-register transparently piggy-back on top of the Node.js build-in dgram and net modules to send a request to nodeos-reverse-proxy to register ports when calling the .bind() and .listen() methods, and unregister automatically when they get clossed. For domains, since there's no standard way to register them on Node.js it's needed to do it by hand by calling to the exported register() and unregister() functions.
Communications with nodeos-reverse-proxy are done using POST requests to the urls http://127.0.0.1/_register and http://127.0.0.1/_unregister, that later are filtered by it to only allow requests from the own machine.