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RE: draft-ietf-httpbis-header-compression-latest, "2.3.2 Dynamic Table"

Mike Bishop <Michael.Bishop@microsoft.com> Wed, 14 June 2017 18:01 UTC

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From: Mike Bishop <Michael.Bishop@microsoft.com>
To: "okis_chuang@trend.com.tw" <okis_chuang@trend.com.tw>, "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>
Thread-Topic: draft-ietf-httpbis-header-compression-latest, "2.3.2 Dynamic Table"
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Date: Wed, 14 Jun 2017 17:58:04 +0000
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Subject: RE: draft-ietf-httpbis-header-compression-latest, "2.3.2 Dynamic Table"
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The decoder sets a maximum size.  The encoder can select the size it wishes to actually use, so long as it’s not greater than the decoder’s limit.  That’s why there’s a limit in both directions – the decoder declares its maximum in HTTP/2 SETTINGS, while the encoder declares the size it’s actually using in an HPACK instruction.

From: okis_chuang@trend.com.tw [mailto:okis_chuang@trend.com.tw]
Sent: Tuesday, June 13, 2017 7:56 PM
To: ietf-http-wg@w3.org
Subject: draft-ietf-httpbis-header-compression-latest, "2.3.2 Dynamic Table"

<https://http2.github.io/http2-spec/compression.html#rfc.section.2.3.2<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fhttp2.github.io%2Fhttp2-spec%2Fcompression.html%23rfc.section.2.3.2&data=02%7C01%7CMichael.Bishop%40microsoft.com%7C24a659790e50463dfec208d4b2f8baf3%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636330228734303857&sdata=q0c%2B501pZdpspgVF26ZPQYyOJqYpZt9Rq1LVgyMu260%3D&reserved=0>>:

Hi,

Good day!

I have a question about the section "The encoder decides how to update the dynamic table and as such can control how much memory is used by the dynamic table. To limit the memory requirements of the decoder, the dynamic table size is strictly bounded (see Section 4.2<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fhttp2.github.io%2Fhttp2-spec%2Fcompression.html%23maximum.table.size&data=02%7C01%7CMichael.Bishop%40microsoft.com%7C24a659790e50463dfec208d4b2f8baf3%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636330228734303857&sdata=XDxJ2a4TBv%2BOZxv6ipbrFpLHnl3eAYqtx8pfGcu5PMA%3D&reserved=0>).”

the decision about how to update the dynamic table is from “encoder” or “decoder”? I thought it is decoder.

Please correct me if it is not :)

Best Regards,

Okis Chuang

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