arcgis web app won't start

[AyoubBeltarchi]

I'm trying to make a test application using Arcgis Web AppBuilder, I built the app downloaded it, unziped it at first the page stuck at loading, so I edited env.js apiUrl = 'init.js'; but the app still not working ,it loads for moments then i get this error message "GET /headless-content.js.map" Error (404): "Not found", I tried to locate this file but never found it. I'm using http-server and nodejs to launch the app.

Any tips how to find out what causes the problem?

Thanks in advance.

[AyoubBeltarchi]

i used development mode and i noticed that the app stop working after redirecting from HTTP to HTTPS  so i changed the portalUrl to an HTTP link, but i still get the same message redirecting to HTTPS... 

[AyoubBeltarchi · Accepted solution]

I had to enable HTTPS on my web server (IIS) https://onlinehelp.coveo.com/en/ces/7.0/administrator/enabling_ssl_in_iis.htm