Unreachable app using Nodejs in Cloud9

Hello and excuse my english

I'm using the PaaS Cloud9 to test an app and when a I run it in nodejs with command:

$ npm run watch

The output in the terminal is:

serving src/main/ at http://crisefd-angular-tutorial-2933453:8888, http://127.0.0.1:8888, http://ift.tt/1MpPSfJ

But when viewing the app in all the address(http or https) both in the Cloud9 visualizer and the browser, It says it can't find the address.

This app works perfectly fine in my laptop, but I need to migrate to Cloud9. I'm guessing the problems has to be related to containers and port mapping ?