request.js

// This will "hang"
http.request('http://localhost:3000/')
  .on('response', function onResponse(response) {
    response.pipe(require('concat-stream')(function (data) {
      console.log(data);
    }));
  })
  .end();
  
// Adding 'data' handler makes it terminate
http.request('http://localhost:3000/')
  .on('response', function onResponse(response) {
    response.on('data', function noop() { }) // adding this makes it terminate propely
    response.pipe(require('concat-stream')(function (data) {
      console.log(data);
    }));
  })
  .end();