router.js

// frontend/app/router.js
import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: config.locationType,
  rootURL: config.rootURL
});

Router.map(function() {
  // ...
  this.route('accept-invitation', { path: '/users/invitation/accept' });
});

export default Router;