reqhangs.js

var http = require('http');
var bl = require('bl');

var server = http.createServer(function (req, res) {
  res.end('OK');
}).listen(3000);

http.request('http://localhost:3000/')
  .on('response', function onResponse(response) {
    response.pipe(bl(function (err, data) {
      console.log(err, data);
    }));
  })
  .end();

console.log(process._getActiveHandles().map(function (h) {
  return h.constructor.name;
}));