ngtcp2 — SETTINGS frame on a request stream

Pass

Rejected with the required error code 0x105.

The client did what the clause requires.

What was measured

Client

ngtcp2 — ngtcp2 + nghttp3 (direct), 3c23148

Test

SETTINGS frame on a request stream — h-settings-on-request-stream

Clause

RFC 9114 §7.2.4 (MUST)

Class

correctness — Rejected something invalid, with the code the RFC names.

Required behaviour

Close the connection with H3_FRAME_UNEXPECTED. SETTINGS belongs to the control stream alone: §7.2.4 says that if an endpoint receives one on a different stream it "MUST respond with a connection error of type H3_FRAME_UNEXPECTED".

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=$(curl -sX POST https://conformance.pqcrypta.com/session | jq -r .id)
# then drive ngtcp2 at the test URL and read the verdict:
curl -s https://conformance.pqcrypta.com/report/$SESSION.json | jq '.results["h-settings-on-request-stream"]'