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

Julian Reschke <julian.reschke@gmx.de> Wed, 14 December 2016 11:56 UTC

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To: Martin Thomson <martin.thomson@gmail.com>, Poul-Henning Kamp <phk@phk.freebsd.dk>
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> <3a65ca44-f652-3b14-6d64-46f35b32df57@isode.com> <55880.1481711031@critter.freebsd.dk> <95057a05-6714-9154-8cf8-7cd302c86715@gmx.de> <60914.1481712680@critter.freebsd.dk> <CABkgnnWzOhkznH2HzweNegYo4dDHE+DT0PM=eCSvVr+-Wkup1A@mail.gmail.com>
Cc: Alexey Melnikov <alexey.melnikov@isode.com>, Matthew Kerwin <matthew@kerwin.net.au>, 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: Julian Reschke <julian.reschke@gmx.de>
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Date: Wed, 14 Dec 2016 12:53:27 +0100
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Subject: Re: Unicode escape sequence | Re: draft-ietf-httpbis-header-structure-00, unicode range
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On 2016-12-14 12:37, Martin Thomson wrote:
> On 14 December 2016 at 21:51, Poul-Henning Kamp <phk@phk.freebsd.dk> wrote:
>> Well, UTF-8 would also go through HPACK, but by eye-ball it seems
>> that it would be more efficient.
>
> If you have lots of ASCII still, you can probably Huffman encode,
> though if you have lots of non-ASCII, you need to watch out: a three
> octet UTF-8 encoded codepoint turns into (worst case) 82 bits.  Best
> case is 58 bits (both of which are invalid, so maybe not).
>
> I can't remember, is there actually a good reason why we can't just
> start shoving UTF-8 in header fields?  I mean, h2 is probably OK with
> this.

Some APIs assume ISO-8859-1, so unexpected things might happen (of 
course that's independent of the actual transport).

Best regards, Julian

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