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1️⃣ CORS Browsers enforce Same-Origin Policy. If API doesn’t allow your frontend origin, it fails. 👉 Postman skips CORS checks. 2️⃣ Preflight (OPTIONS) Browsers send a test OPTIONS request for custom headers/methods. If backend doesn’t handle it → fail. 👉 Postman sends the request directly. 3️⃣ Headers Postman lets you ...
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