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

Poul-Henning Kamp <phk@phk.freebsd.dk> Fri, 15 May 2020 16:09 UTC

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To: Julian Reschke <julian.reschke@gmx.de>, mnot@mnot.net, phk@varnish-cache.org
cc: Willy Tarreau <w@1wt.eu>, 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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From: Poul-Henning Kamp <phk@phk.freebsd.dk>
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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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--------
In message <4859a11f-5649-b633-f43b-facf036e61c7@gmx.de>, Julian Reschke writes
:

>Related to this: it just occurred to me that:
>
>   Test: Foo
>   Test:
>   Test: Bar
>
>yields different results for fields using HTTP's list notation, and
>structured header fields.
>
>In the former case, the combined value is equivalent to
>
>   Test: Foo, Bar
>
>while in the latter case, the field is malformed.
>
>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.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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