Does the bundler proxy work in production?
Usually not. The bundler proxy is for development. In production, you typically do not have the bundler running, so you route API calls through your actual backend, which can add the correct CORS headers.
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More FAQs in CORS in Production vs Development: What Changes for React Apps
In development, you use a proxy or extension to bypass CORS locally. In production, you must configure the backend to return the right CORS headers for the frontend domain, or serve both from the same origin to avoid CORS entirely.
Because your local proxy bypassed CORS, but the production backend is not configured to allow your frontend domain. Always test CORS after deploying, not just on localhost, and configure the production backend's CORS headers.
Serve your frontend and backend from the same origin. Many production setups proxy API calls through the same domain, so there is no cross-origin request and no CORS issue at all.
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