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RE: http/2 & hpack protocol review

From: <K.Morgan@iaea.org>
Date: Tue, 6 May 2014 16:49:06 +0000
To: <martin.thomson@gmail.com>, <erik@nygren.org>, <Gabriel.Montenegro@microsoft.com>, <grmocg@gmail.com>
CC: <ynir.ietf@gmail.com>, <ietf-http-wg@w3.org>, <C.Brunhuber@iaea.org>
Message-ID: <0356EBBE092D394F9291DA01E8D28EC2011298BCC7@sem001pd.sg.iaea.org>
On Monday,05 May 2014 18:51, martin.thomson@gmail.com<mailto:martin.thomson@gmail.com> wrote:
> On 5 May 2014 08:50, Erik Nygren <erik@nygren.org<mailto:erik@nygren.org>> wrote:

>> I do think that the idea of a light-weight HTTP/2 profile may make sense.


> This has been proposed, but it wasn't considered interesting enough to specify.  See [1].

> ...

> [1] tools.ietf.org/html/draft-montenegro-httpbis-http2-server-profiles

I could only find one place this draft was even mentioned on the mailing list [1]. Apparently nobody responded to Gabriel and Roberto?  Is that the definition of not interesting?  For the record, I'm now expressing an interest :)

I think it sounds like a great idea, though it doesn't solve the problem for non-TLS case.

As Peter pointed out in his review, an endpoint can "simplify" its implementation by setting the SETTINGS_* to appropriate values.  But some of it still can't be simplified e.g. in HPACK we can set the table size to 0, but we can't disable Huffman. Why not?

I think the default SETTINGS_* should be at the levels similar to what Gabriel and Roberto proposed to call the "constrained server profile" [3].  This would only affect the connection for one RTT until the server is able to upgrade its settings to the "normal server profile".  Changing the SETTINGS_* in the other direction would "overrun any of the server's preferences" (as Gabriel and Roberto called it).

(For the TLS case I think the Gabriel and Roberto's idea is the better way as you can immediately start at the server's settings preferences.)

[1] http://lists.w3.org/Archives/Public/ietf-http-wg/2013JulSep/1141.html

[2] http://lists.w3.org/Archives/Public/ietf-http-wg/2014AprJun/0602.html

[3] http://tools.ietf.org/html/draft-montenegro-httpbis-http2-server-profiles-00#section-2

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Received on Tuesday, 6 May 2014 16:49:48 UTC

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