Envoy HTTP/2 CANCEL frame does not trigger upstream deadline expiration
Determine whether Envoy interprets an incoming HTTP/2 CANCEL frame as a request deadline expiration that should be forwarded to the upstream via the x‑envoy‑upstream‑rq‑timeout header and result in a graceful connection shutdown aligned with the route’s idle timeout and the current xDS lease. Observations suggest that Envoy v1.22 handles CANCEL frames on a b