CORS for Microservices Architecture: Practical Reference
CORS gets messy fast in microservices. A single frontend might call an API gateway, which fans out to auth, billing, search, notifications, and a couple of legacy services nobody wants to touch. Then one team enables Access-Control-Allow-Origin: *, another requires cookies, a third forgets OPTIONS, and suddenly the browser is your loudest incident reporter. This guide is the version I wish more teams used: practical rules, copy-paste configs, and the stuff that breaks in real systems. ...