IPv6 and IPv4 listen test

ipv6-ipv4-test.js

var http = require('http');

var server = http
    .createServer(function(req, res) {
        console.log(req.method, req.url);
        res.end('Ok!');
    })
    .listen(9000, '::', function(err) {
        err && console.log(err.stack);
        console.log(server.address());
    });