CORS post with preflight request

Question

I\'m trying to upload files to a service on a different domain using CORS, but they keep failing due to the origin being denied. As far as I can see the correct headers are bein

Answer 1

The subdomains are different. As far as CORS is concerned the subdomain, protocol and port have to be identical in the Origin and the Access-Control-Allow-Origin.

In your example it looks like the origin is: https://www.example.com and the Access-Control-Allow-Origin is: https://files.example.com