Re: Last Call: <draft-ietf-httpbis-header-structure-18.txt> (Structured Field Values for HTTP) to Proposed Standard

Willy Tarreau <w@1wt.eu> Fri, 15 May 2020 16:13 UTC

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Date: Fri, 15 May 2020 18:12:20 +0200
From: Willy Tarreau <w@1wt.eu>
To: Poul-Henning Kamp <phk@phk.freebsd.dk>
Cc: Julian Reschke <julian.reschke@gmx.de>, mnot@mnot.net, phk@varnish-cache.org, last-call@ietf.org, httpbis-chairs@ietf.org, ietf-http-wg@w3.org, barryleiba@gmail.com, draft-ietf-httpbis-header-structure@ietf.org
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Subject: Re: Last Call: <draft-ietf-httpbis-header-structure-18.txt> (Structured Field Values for HTTP) to Proposed Standard
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On Fri, May 15, 2020 at 04:06:37PM +0000, Poul-Henning Kamp wrote:
> --------
> In message <4859a11f-5649-b633-f43b-facf036e61c7@gmx.de>de>, Julian Reschke writes
> >I *really* think it would be better if structured header fields would
> >actually be "proper" applications of the standard HTTP list ABNF.
> 
> Considering how rarely used multiple-headers are (apart from The
> Cookie Mistake) I think it would be much simpler, better and wiser
> to restrict SH to single, non-concatenated headers.
> 
> Ufortunately, that also runs up against the fact that we cannot
> possibly know if the header we got was joined by an unwitting
> intermediary.

Definitely, which is why suggesting that each occurrence must conform
is a good compromise which is much easier to enforce at multiple points
in the chain.

Willy