Rejected with the required error code 0x200.
The client did what the clause requires.
What was measured
- Client
- neqo — neqo (Firefox), 0.31.1
- Test
- Field line indexing a static table entry that does not exist —
h-qpack-static-index-invalid - Clause
- RFC 9204 §3.1, §4.5.2 (MUST)
- Class
- correctness — Rejected something invalid, with the code the RFC names.
- Required behaviour
- Close the connection with QPACK_DECOMPRESSION_FAILED (0x200). The static table has 99 entries, so index 200 refers to nothing, and §3.1 is explicit: "When the decoder encounters an invalid static table index in a field line representation, it MUST treat this as a connection error of type QPACK_DECOMPRESSION_FAILED." The static table needs no permission and never changes size, so unlike the dynamic-table tests this one applies to every client.
- Measured
- 2026-09-18
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=$(curl -sX POST https://conformance.pqcrypta.com/session | jq -r .id)
# then drive neqo at the test URL and read the verdict:
curl -s https://conformance.pqcrypta.com/report/$SESSION.json | jq '.results["h-qpack-static-index-invalid"]'