Cors Hell In Ionic 3

I have a backend server (Spring Boot, proxied by nginx) that my Ionic application communicates with. With every single request, it sends the following headers: access-control-reque

Solution 1:

CORS again, I am hoping that this might help someone:

Apparently wildcard(*) value for Acccess-Control-Allow-Headers header is only accepted in May 2016 (reference1, reference2), so some browsers might still not support it. So, changing from:

Access-Control-Allow-Headers: *

to

Access-Control-Allow-Headers: Content-Type, X-Auth-Token

(basically, the exact value of headers my application uses), I was able to resolve the issue. Apparently browser I am using on my desktop supports the wildcard header value, but the browser of the emulator and device doesn't. Definitely not a device vs. emulator issue, but a browser vs. browser issue.