Ignored the unrecognised element and completed the follow-up request. The client process had already exited 1352ms in, before this test's reaction point at never observed, so the silence after that is not evidence either way.
The client did what the clause requires.
What was measured
- Client
- msquic — .NET HttpClient + msquic, 2.7.0 (7e6525d)
- Test
- Reserved SETTINGS identifier (0x1f·N+0x21) —
h-grease-settings - Clause
- RFC 9114 §7.2.4.1 (MUST)
- Class
- extensibility — Ignored something unknown and carried on.
- Required behaviour
- Ignore the unknown setting and complete the request.
- Measured
- 2026-10-27
Reproduce it
The suite is the judge, so the reproduction is to point the same client at the same test and let the server report what it saw.
SESSION=$(curl -sX POST https://conformance.pqcrypta.com/session | jq -r .id)
# then drive msquic at the test URL and read the verdict:
curl -s https://conformance.pqcrypta.com/report/$SESSION.json | jq '.results["h-grease-settings"]'