CORS and Rate Limiting: Where They Help and Hurt
CORS and rate limiting solve completely different problems, but they collide in production all the time. CORS decides which browser-based origins can read your responses. Rate limiting decides how often a client can hit your API. One is a browser enforcement layer. The other is an abuse-control and fairness layer. They look unrelated until your frontend starts getting mysterious TypeError: Failed to fetch errors right when users hit quota limits. ...