half-hang.js

var net = require('net');

var server = net.createServer(function (socket) {
  console.log("connection");
  socket.on('data', function (data) { console.log('SERVER data', data);});
  socket.on('end', function () { console.log('SERVER end'); server.close(); });
  socket.on('close', function () { console.log('SERVER close');  });

  console.log("SERVER sending");
  socket.write(".");
  console.log("SERVER ending");
  socket.end();
});
server.listen(1337, function () {
  console.log("Server at 1337");
  var socket = net.createConnection({port: 1337, allowHalfOpen: true}, function () {
    socket.write(".");
    console.log("CLient sending data");
  });
  socket.on('data', function (data) { console.log('CLIENT data', data); });
  socket.on('end', function (end) { console.log('CLIENT end');});

});

Here is output when I test this on my linux machine:

Server at 1337
connection
SERVER sending
SERVER ending
CLient sending data
CLIENT data <Buffer 2e>
SERVER data <Buffer 2e>
CLIENT end