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Re: Header Compression

From: Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
Date: Sat, 8 Jun 2013 00:32:34 +0900
Message-ID: <CAPyZ6=LvDXkwf=K+nSejtp_WB=0RTMNzGTZnJ4kvhmmvijZY_g@mail.gmail.com>
To: RUELLAN Herve <Herve.Ruellan@crf.canon.fr>
Cc: "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>

On Thu, Jun 6, 2013 at 4:17 AM, RUELLAN Herve <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:
> https://github.com/http2/compression-spec
> 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 Friday, 7 June 2013 15:33:21 UTC

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