Preflight Requests: For complex requests (like POST with non-standard headers), browsers send a preflight OPTIONS request. Your API should respond to this

Short answer: ppropriately. Example: If your frontend is hosted at nd your microservices re hosted at your microservice’s response headers would look like this: ccess-Control-Allow-Origin: ccess-Control-Allow-Methods: GET, POST

Real-world example (ShopNest)

ShopNest splits Catalog, Cart, Order, and Payment into services so teams can deploy catalog changes without redeploying payments.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.