My go-to link for that class of issue is: https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#Simple_requests https://developer.mozilla.org/en-US/docs/Web/HT

My go-to link for that class of issue is: https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#Simple_requests https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#Simpl... It's usually a lot easier to write the PoC with fetch() though.