gistfile1.js

var cluster = require('cluster')
  , http = require('http')
  , net = require('net');

if (cluster.isMaster) {
  var srv = http.createServer();
  srv.on('upgrade', function(req, socket, upgradeHead) {
    console.log('upgraded successfully');
    socket.end();
  });
  srv.listen(1337, '127.0.0.1', function() {
    cluster.fork();
  });
  cluster.on('death', function() { srv.close(); });
}
else {
  var client = net.connect(1337, function() {
    var lines = [
      'GET /demo HTTP/1.1',
      'Upgrade: WebSocket',
      'Connection: we love corndogs, and there are no upgrades here',
      'Host: example.com'
    ];
    client.write(lines.concat(['', '']).join('\r\n'));
  });
  client.on('end', function() { process.exit(); });
}