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Re: Unicode escape sequence | Re: draft-ietf-httpbis-header-structure-00, unicode range

Alexey Melnikov <alexey.melnikov@isode.com> Wed, 14 December 2016 10:04 UTC

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To: Poul-Henning Kamp <phk@phk.freebsd.dk>, Matthew Kerwin <matthew@kerwin.net.au>
References: <20161213173327.C1F7D1714B@welho-filter2.welho.com> <20161213175419.GA7943@LK-Perkele-V2.elisa-laajakaista.fi> <25434.1481665395@critter.freebsd.dk> <201612140628.uBE6SO3L025885@shell.siilo.fmi.fi> <36792.1481701328@critter.freebsd.dk> <CACweHNDKgWQewZHb=Kz3_2=41M58sY5472Q5OwpqPLxorvkzHQ@mail.gmail.com> <37223.1481707288@critter.freebsd.dk>
Cc: Kari Hurtta <hurtta-ietf@elmme-mailer.org>, Ilari Liusvaara <ilariliusvaara@welho.com>, HTTP working group mailing list <ietf-http-wg@w3.org>, Poul-Henning Kamp <phk@varnish-cache.org>
From: Alexey Melnikov <alexey.melnikov@isode.com>
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Date: Wed, 14 Dec 2016 09:59:52 +0000
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Subject: Re: Unicode escape sequence | Re: draft-ietf-httpbis-header-structure-00, unicode range
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On 14/12/2016 09:21, Poul-Henning Kamp wrote:

> --------
> In message <CACweHNDKgWQewZHb=Kz3_2=41M58sY5472Q5OwpqPLxorvkzHQ@mail.gmail.com>
> , Matthew Kerwin writes:
>
>> If we're looking for inspiration elsewhere, why not C99?
>>
>>       "\" %x75 1*4HEXDIG
>>     / "\" %x55 1*6HEXDIG  ; C99 accepts 1*8
> The variable length means these run into the mess of "what if the
> next character is a hex digit?".
>
> That's a much bigger issue when we're talking about code spitting
> out strings than when it is programmers typing them in.
>
> I would prefer to make them fixed length:
>
> 	"\" "u" 4HEXDIG
> 	"\" "U" 6HEXDIG
IETF has published BCP 137, which should be followed, unless there is a 
very good reason not to:
  https://www.rfc-editor.org/bcp/bcp137.txt

See section 5.1.

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