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This means that you are not including Content-Type in the list of headers included in the access-Control-Request-Headers header in your HTTP OPTIONS request.
CORS can be complex - you need to reply to that OPTIONS request (a CORS PreFlight Request) with a response that includes a Access-Control-Allow-Headers header that lists the headers out of Access-Control-Request-Headers that you would allow to be used in future CORS requests.
Refer too https://fetch.spec.whatwg.org/#http-cors-protocol for detail on how this works.
