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I think you have it backwards, it doesn't make sense to add CORS to itch.io since you wouldn't be making requests there. We don't have a server running on our domain that would know how to respond to your request. If you want to have your game communicate with your own domain you would want to add CORS to your domain

(+1)

It is true, I really had it in the wrong way. I'm kinda new with theses things! Thanks for the replies, I did make it work after understanding how all of this works!

Thanks, leafo!