Ember-plupload and node-pluploader callback

I don't know how to use the callback to show in ember how many files were uploaded, here is my code.
route:

import Ember from "ember";

const get = Ember.get;
const set = Ember.set;

export default Ember.Route.extend({
  actions: {
    uploadImage: function (file) {
      file.read().then(function (url) {
        if (get(image, 'url') == null) {
          set(image, 'url', url);
        }
      });

      file.upload('http://localhost:3000/upload').then(function (response) {
        set(image, 'url', response.headers.Location);
        return image.save();
      }, function () {
        image.rollback();
      });
    }
  }
});

and a node.js with node-pluploader

var pluploader = new Pluploader({
  uploadLimit: 16,
  uploadDir: 'saved/'
});

pluploader.on('fileUploaded', function(file, req) {
  console.log(file);
});

pluploader.on('error', function(error) {
    throw error;
});

router.post('/upload', function(req, res){
  pluploader.handleRequest(req, res)
});

Where can I put the callback in the code? I've tried with res.send in the router.post function but it won't work :/

Greetings, Rafał