Is CORS enabled on the server? Access is blocked on localhost (using JavaScript fetch)

Hi there, here's the full error: Access to fetch at '{postcode}' from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: It does not have HTTP ok status. The API works great on external testing tools (e.g. Postman), and I'm including the required subscription key in the request headers. Just doesn't work in my browser. Thanks for any help!

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