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Re: draft-ietf-httpbis-header-structure-00 for general structured data

"Poul-Henning Kamp" <phk@phk.freebsd.dk> Sat, 24 December 2016 07:46 UTC

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To: Amos Jeffries <squid3@treenet.co.nz>
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From: Poul-Henning Kamp <phk@phk.freebsd.dk>
References: <CAK_TSXLJcDkUCpn5f79DBtnGjjPLtb1fEv_-Akfg4cPbboFVvg@mail.gmail.com> <38632.1482431937@critter.freebsd.dk> <35e612ec-5452-2fd3-358d-5285bcb5225d@gmx.de> <230C725C-1D6B-4E83-A9A4-A901BD4A0404@mnot.net> <8f17660e-449f-7c4e-31b7-ba8d3f6af944@treenet.co.nz>
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Date: Sat, 24 Dec 2016 07:43:17 +0000
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Subject: Re: draft-ietf-httpbis-header-structure-00 for general structured data
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--------
In message <8f17660e-449f-7c4e-31b7-ba8d3f6af944@treenet.co.nz>, Amos Jeffries 
writes:

>AFAICS for most of the headers that will benefit from generic syntax
>parsing instead of custom parsers the desirable behavour is to normalize
>foo;o=X;o=y down to just foo;o=y to prevent foo;o=X vs foo;o=y
>interpretation differences by various recipients and nasty values being
>smuggled through middleware.
>
>If we can avoid having parameter name duplication, that would be a good
>step towards uniform handling of these smuggling protections.

I have deliberately not written that dictionaries cannot have duplication,
but smuggling prevention is a good reason to require that.

-- 
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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