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RE: Header Compression

From: RUELLAN Herve <Herve.Ruellan@crf.canon.fr>
Date: Mon, 17 Jun 2013 16:35:42 +0000
To: Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
CC: "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>
Message-ID: <6C71876BDCCD01488E70A2399529D5E525EC018E@ADELE.crf.canon.fr>

This is not a silly question: I updated the example to quickly and forgot to take into account the diff encoding of header sets. I will correct it in a future version.

Thanks for noticing this.

From: Tatsuhiro Tsujikawa [tatsuhiro.t@gmail.com]
Sent: Friday, June 07, 2013 17:32
Cc: ietf-http-wg@w3.org
Subject: Re: Header Compression


On Thu, Jun 6, 2013 at 4:17 AM, RUELLAN Herve <Herve.Ruellan@crf.canon.fr<mailto:Herve.Ruellan@crf.canon.fr>> wrote:
Roberto and I have been discussing for some time and we have created a joint proposal for Header Compression.

The resulting spec is available at:

The main features of this proposal are:
- One single table for indexing headers as (name, value) pairs.
- HeaderDiff-based serialization (indexed header, literal header with either no indexing, addition indexing, or replacement indexing).
- Delta2-based diff between two successive header sets.
- Possibility of bounding table size.
- Least recently written eviction strategy when an insertion cause table size limit to be reached.

We will present it in details at the next interim meeting. Until then, all questions and comments are welcome.

I have a question about "reference set of headers" in section 3.3. Differential Coding.
It seems that reference set of headers are only referred in this section and I failed to see how it works.
I may be wrong but I don't see it in Appendix B. Example. It only refers to the update to the header table.
Is the reference set of headers equal to header table? It seems it is not.
Could you add each state of "reference set of headers" and its working set in the example so that the reader
can understand how it works? Sorry if this is the silly question, but it might help the reader like me.

Best regards,

Tatsuhiro Tsujikawa
Received on Monday, 17 June 2013 16:36:12 UTC

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