picoquic — DATA frame before any HEADERS on the response stream

Pass

Rejected with the required error code 0x105.

The client did what the clause requires.

What was measured

Client

picoquic — picoquic + picotls, 8162550

Test

DATA frame before any HEADERS on the response stream — h-data-before-headers

Clause

RFC 9114 §4.1 (MUST)

Class

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

Required behaviour

Close the connection with H3_FRAME_UNEXPECTED. A response begins with a field section, and §4.1 makes "receipt of an invalid sequence of frames" a connection error of that type — a body arriving before the headers that describe it is exactly that.

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