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Re: Submitted new I-D: Cache Digests for HTTP/2

Ilya Grigorik <ilya@igvita.com> Thu, 14 January 2016 14:18 UTC

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From: Ilya Grigorik <ilya@igvita.com>
Date: Thu, 14 Jan 2016 06:13:01 -0800
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To: Kazuho Oku <kazuhooku@gmail.com>
Cc: Stefan Eissing <stefan.eissing@greenbytes.de>, Amos Jeffries <squid3@treenet.co.nz>, HTTP Working Group <ietf-http-wg@w3.org>
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Subject: Re: Submitted new I-D: Cache Digests for HTTP/2
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On Thu, Jan 14, 2016 at 12:55 AM, Kazuho Oku <kazuhooku@gmail.com> wrote:

> So a SW trying to send cache digest needs to send the value without
> designating it as a hop-by-hop header.  And that means that if a H2
> origin server sees the header, it needs to determine if the request
> came through an intermediary, and only use the value if it did not.
> Or else, a server might end up repeatedly pushing resources to a
> caching proxy that already has them cached.
>
> This looks like a hack to me, and I am not sure if it should be
> permitted within a specification, even though I believe it would work
> effectively (as we are doing in H2O).
>

With HTTPS in place, I think you can make some reasonable simplifying
assumptions here.. that'll make things work in practice.

ig

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