Re: JFV and Common Structure specifications

"Poul-Henning Kamp" <phk@phk.freebsd.dk> Wed, 23 November 2016 07:32 UTC

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To: Martin Thomson <martin.thomson@gmail.com>
cc: Mark Nottingham <mnot@mnot.net>, HTTP Working Group <ietf-http-wg@w3.org>, Patrick McManus <mcmanus@ducksong.com>
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From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
References: <3A206EA7-57FB-4913-BC08-445BD2EFA783@mnot.net> <CABkgnnV8=2_sR-B-6e9Haxi+4M4DF4V7f3CWCVvXDHNN_SkTKw@mail.gmail.com> <98329.1479720181@critter.freebsd.dk> <CABkgnnVqH6TPi0OJ5iecYBj2gRich+DMLnxxQJcw9Qn6n-JPBA@mail.gmail.com> <65242.1479800991@critter.freebsd.dk> <E5207840-A825-43B5-B42F-6C56314EA703@mnot.net> <65743.1479808295@critter.freebsd.dk> <CABkgnnXwOOmv3sJKrufs19ErUNA65iMm32aypRBH=z+F8mWGSQ@mail.gmail.com>
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Date: Wed, 23 Nov 2016 07:28:06 +0000
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Subject: Re: JFV and Common Structure specifications
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--------
In message <CABkgnnXwOOmv3sJKrufs19ErUNA65iMm32aypRBH=z+F8mWGSQ@mail.gmail.com>om>, Martin Thomson writes:
>On 22 November 2016 at 20:51, Poul-Henning Kamp <phk@phk.freebsd.dk> wrote:

>Let's not talk about policy and instead concentrate on cost-benefit.
>Mark has summarized the costs quite well, I think.  I would go further
>and point out that a recursive syntax with quoting cannot have
>elements that are skipped by a parser, which I find results in simply
>externalizing those costs.

Have you ever implemented SOM, EOM and EOT according to spec in any
of the programs you have written to deal with ASCII text ?

No ?

So can we agree that the cost of those three ASCII characters have
been very close to zero for you ?

Just because a standard contains an extension point, does not mean
you have to implement that extension - unless you actively decides
to use it.

And I keep repeating:  There should be no recursion in IETF defined
HTTP headers, but we should leave the extension there for end-to-end
usage.

-- 
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.