Webgl + webhost + photon pun + CORS

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Building and running in my local machine works fine, but when runnning from server(000webhost) give me the following error on web console while loading the scene:

No 'Access-Control-Allow-Origin' header is present on the requested resource

for what i searched for it seems i have to add headers in the server response for CORS, but no ideia how i do that, i am c# coder/math and no skills on web

any suggestions to solve this?