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Re: Delta Compression and UTF-8 Header Values

James Cloos <cloos@jhcloos.com> Mon, 11 February 2013 21:43 UTC

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From: James Cloos <cloos@jhcloos.com>
To: James M Snell <jasnell@gmail.com>
Cc: Mark Nottingham <mnot@mnot.net>, "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>
In-Reply-To: <CABP7RbcRrjV7EhwoGbkWbYJEXeWOwH4gQuaCG7N0siQqeMtcag@mail.gmail.com> (James M. Snell's message of "Fri, 8 Feb 2013 17:10:02 -0800")
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Date: Mon, 11 Feb 2013 16:34:03 -0500
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Subject: Re: Delta Compression and UTF-8 Header Values
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>>>>> "JMS" == James M Snell <jasnell@gmail.com> writes:

JMS> we'll be able to huffman code anything that is flagged
JMS> as ASCII, and won't be able to touch the rest.

Would that really be an issue?  The static huffman can only really be
for the common strings, yes?  Which mostly means the header names and
not the header values?  So even if the headers were limited to ascii
the tables wouldn't help much for most of the values?

(As an aside, Would arithmetic be of any better value than huffman, here?)

Using one bit for each string to specify utf8-text blob vs binary blob,
and using the former for everthing know to be text, seems the best
overall choice.  And if any non-ascii utf8 sequences become common
enough, they can be added to future revisions of the static table just
as easily as 7-bit strings can be.

-JimC
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James Cloos <cloos@jhcloos.com>         OpenPGP: 1024D/ED7DAEA6

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