How do CORS and Access-Control-Allow-Headers work?

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Yes, you need to have the header Access-Control-Allow-Origin: http://domain.example:3000 or Access-Control-Allow-Origin: * on both the OPTIONS response and the POST response. You should include the header Access-Control-Allow-Credentials: true on the POST response as well.

Your OPTIONS response should also include the header Access-Control-Allow-Headers: origin, content-type, accept to match the requested header.

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