403 error: Ajax post call in ionic app

I have a strange Problem. The app is working fine in browser but I am not able to make ajax POST request in android device. Its giving 403 error.

I am using Django-rest for backend apis. Oauth2 for authentication. Also i set Cors header in django and sending the required access token in http header.

headers: {'Authorization': 'Bearer '+ionicCookies.get('access_token')}

Can anyone please tell what i am missing?