child.js

var net = require('net');

var s = new net.Stream(0, 'unix');
s.resume();

s.addListener('fd', function(fd) {
    http.createServer(function (req, res) {
        sys.debug("Got request at " + process.pid);
        res.writeHead(200, {"Content-Type": "text/plain"});
        res.end("Hello from " + proces.pid);
    }).listenFD(fd, "tcp4");
});

master.js

var child_process = require('child_process');
var netBinding = process.binding('net');

for (var i = 0; i < 4; i++) {
    var fds = netBinding.socketpair();
    var cp = child_process.spawn(
        'node',
        ['worker.js'],
        undefined,
        [fds[0], fds[1], -1]
    );

    child.stdin.write("http fd", "ascii", fd);
    child.stderr.addListener('data', function (data) {
        process.stdout.write(data);
    });
}