Every token validation hit our origin. Now the JWKS lives on the edge.
The two documents a service reads to validate one of our JWTs — the discovery doc and the JWKS — are the most-requested, least-secret things we serve, and every fetch used to come all the way back to origin. Caching them on Cloudflare was the easy part. The hard part is that a stale public-key cache must never reject a valid token, and here's the rotation-safe ordering that makes an aggressively-cached JWKS safe.
