Ionic Browser CORS issue

Hello. im having problem deploying my Ionic project as PWA(Browser). after i build my project using

‘ionic crodova build browser --prod --release’ and deploy it on my server i’m having CORS issues… can someone help me? thanks

global packages:

Cordova CLI : 7.0.1

local packages:

@ionic/app-scripts : 1.3.8
Cordova Platforms  : android 6.2.3 browser 4.1.0
Ionic Framework    : ionic-angular 3.4.2


Node : v6.11.1
OS   : Windows 10
npm  : 3.10.10

Yes: Fix the CORS issues.

Serious: What errors? Where? With what error messages? By what code?

here’s the error

XMLHttpRequest cannot load Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘’ is therefore not allowed access. The response had HTTP status code 401.

eventhough i already deploy it on my production server

Make your server respond to the preflight with the correct header.

How and where are you testing your app?