Why Your CORS Setup Breaks in Production You build the API. Test it locally. Everything works...
CORS misconfiguration breaks production; origin: '*' disables auth and exposes the API to any website. For engineering leads, CORS allowlist management is mandatory security — domain migrations require backend reconfiguration or cause auth failures.
Why Your CORS Setup Breaks in Production
You build the API. Test it locally. Everything works perfectly.
Then you deploy, and suddenly the browser console is full of red text about CORS policy violations.
If you've been there, here's why it happens and how to actually fix it instead of just slapping origin: '*' on everything and hoping for the best.
1. Localhost is forgiving. Production is not.
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