Re: HTTP/3 CONNECT requests, body, and trailers

• From: Martin Thomson <mt@lowentropy.net>
• Date: Fri, 06 Feb 2026 10:54:34 +1100
• To: ietf-http-wg@w3.org
• Message-Id: <c2bc85e7-ee6c-485e-b447-0b7cc92b83df@betaapp.fastmail.com>

On Fri, Feb 6, 2026, at 06:58, Lucas Pardue wrote:
> Alex beat me to what I was going to say here. The proposed text could 
> be wordsmithed more I guess. Still not convinced this is a huge spec 
> problem though (the protocol-level requirements are correct IMO, just 
> maybe not super obvious on first inspection but what is?)

You are both right, of course.  This did seem editorial, but the 2xx/200 question below might tip that further toward being technical.

Is it 2xx that has no response body, or is it only 200?  I don't know if we ever really decided that.

> A CONNECT request consists of a header block only and cannot contain a body or trailers; similarly, a 200 response to a CONNECT requests consists of a header block only.  Other responses to a CONNECT request are normal HTTP responses and can contain a body (that can explain why a request failed, for example).

Received on Thursday, 5 February 2026 23:54:59 UTC