Problems with POST through HTTP.request

Nicely spotted indeed! All working now - thanks...
For my future reference here's the final code that works (note that the res.on() events are only triggered if the server actually returns something:

var WIFI_NAME = "";
var WIFI_OPTIONS = { password : "" };
var wifi = require("EspruinoWiFi");

wifi.connect(WIFI_NAME, WIFI_OPTIONS, function(err) {
  if (err) {
    console.log("Connection error: "+err);
    return;
  }
  console.log("Connected!");
  sendData();
});

function sendData() {
  var content = "{module:'espruino'}";
  var options = {
    host: '192.168.1.66', // host ip (host name works as well)
    port: 8081,            // (optional) port, defaults to 80
    path: '/stats/login/',           // path sent to server
    method: 'POST',
    headers: { "Content-type" : "application/json",
             "Content-length": content.length} 
  };
  
  var req = require("http").request(options, function(res) {
    console.log('res',res);
    res.on('data', function(data) {
      console.log("HTTP> "+data);
    });
    res.on('close', function(data) {
      console.log("Connection closed");
    });
  });
  
  req.on('error',function(err){
    console.log(err);
  });
  
  req.end(content);  
  console.log("Request sent");  
}