Re: I-D Action: draft-ietf-httpbis-client-hints-03.txt
Mark Nottingham <mnot@mnot.net> Fri, 23 December 2016 15:17 UTC
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From: Mark Nottingham <mnot@mnot.net>
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Date: Fri, 23 Dec 2016 10:14:17 -0500
Cc: Ilya Grigorik <ilya@igvita.com>, "ietf-http-wg@w3.org Group" <ietf-http-wg@w3.org>
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References: <148070210225.29664.2630836091018103593.idtracker@ietfa.amsl.com> <33226.1480703913@critter.freebsd.dk> <21010c5f-6a6c-1632-b3dd-d0cec7a9e336@gmx.de> <95134.1480926027@critter.freebsd.dk> <e90e3aa8-9e53-f077-f6ab-7c7fc50e0061@gmx.de> <95173.1480926596@critter.freebsd.dk> <CAKRe7JFkmrjMQ2UHfBr94vLuASDe5p36mJHVEHYGfrGtY9NSbQ@mail.gmail.com> <CABkgnnVmWRnv+Ku2CNLncxKuWHJPL+NTkvr6+BqY3otieXgXLA@mail.gmail.com>
To: Martin Thomson <martin.thomson@gmail.com>
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Subject: Re: I-D Action: draft-ietf-httpbis-client-hints-03.txt
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> On 13 Dec. 2016, at 7:31 pm, Martin Thomson <martin.thomson@gmail.com> wrote: > > On 6 December 2016 at 08:51, Ilya Grigorik <ilya@igvita.com> wrote: >> Background: https://github.com/httpwg/http-extensions/issues/168 >> >> We didn't intend Save-Data to be a list.. The goal was to allow attributes >> on the single token defined in CH. I'll defer to Mark on Key. > > > Whether you have a list or not, Save-Data has some odd semantics when > it comes to extension. How do I model the following variants? > > Save-Data: on > Save-Data: on;video-only > Save-Data: on;exclude-video > Save-Data: on;compress-video-more > > Assuming that the extensions are not understood, we end up in an odd > place. I see several conclusions: > > 1. unknown extensions are ignored > 2. unknown extensions can only increase the amount of compression; and > are ignored otherwise (see compress-video-more) > 3. unknown extensions cause the entire clause to be ignored > > Option 1 seems to be what we have right now, but that doesn't give a > client any way to request selective compression (the > video-only/not-video example). > > Option 2 might allow a client to request more aggressive compression, > but it does nothing to address the case where a client wants video > compression, but would prefer not to have images degraded by > compression. > > Option 3 might be combined with a comma-separated list to allow > clients to provide a fallback strategy. > > There's also probably something more complex as well. I think there's also an Option 4: extensions can only be defined by a sd-token, when it is defined. I.e., this extension syntax is for the use of future sd-tokens, not for arbitrary extension independent of them. That's what I'd assumed when we defined the syntax; regardless of the intent, we should write something down about how the extension point is used. Cheers, -- Mark Nottingham https://www.mnot.net/
- I-D Action: draft-ietf-httpbis-client-hints-03.txt internet-drafts
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Poul-Henning Kamp
- RE: I-D Action: draft-ietf-httpbis-client-hints-0… Mike O'Neill
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Julian Reschke
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Poul-Henning Kamp
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Julian Reschke
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Poul-Henning Kamp
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Ilya Grigorik
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Julian Reschke
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Mark Nottingham
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Ilya Grigorik
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Mark Nottingham
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Poul-Henning Kamp
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Martin Thomson
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Nick Doty
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Mark Nottingham
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Mark Nottingham
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Mark Nottingham
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Mark Nottingham
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Nick Doty
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Mark Nottingham
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Nick Doty
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Ilya Grigorik
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Mark Nottingham
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Ilya Grigorik
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Mark Nottingham
- Re: I-D Action: draft-ietf-httpbis-client-hints-0… Ilya Grigorik