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

Kazuho Oku <kazuhooku@gmail.com> Mon, 18 January 2016 14:50 UTC

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Date: Mon, 18 Jan 2016 23:46:34 +0900
Message-ID: <CANatvzw2JPmii3x9Wm4qH2v4XmDXLxjizmpDc7yodG12yR7_hw@mail.gmail.com>
From: Kazuho Oku <kazuhooku@gmail.com>
To: Julian Reschke <julian.reschke@gmx.de>
Cc: Stefan Eissing <stefan.eissing@greenbytes.de>, Martin Thomson <martin.thomson@gmail.com>, Ilya Grigorik <ilya@igvita.com>, 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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2016-01-18 19:32 GMT+09:00 Julian Reschke <julian.reschke@gmx.de>:
> On 2016-01-18 11:19, Stefan Eissing wrote:
>>
>> +1 generic header parameter form.
>>
>> If I may make a proposal:
>>
>> Cache-Digest      = "Cache-Digest" ":" #digest-value
>>    digest-value    = "<" base64url encoded digest ">" *( ";" digest-param
>> )
>>    digest-param    = ( ( "domain" "=" domain-value )
>>                    | ( "path" "=" path-value )
>>                    | ( "codec" "=" codec-value )
>>                    | ( "update" ( "=" update-param ) )
>>                    | ( digest-extension ) )
>>
>>   digest-extension = ( parmname [ "=" ( ptoken | quoted-string ) ] )
>>
>>   domain-value     =
>>         authority              # defined in RFC3986
>>         | wildcard-identifier  # defined in RFC 6125 6.4.3
>>
>>   path-value       = path-absolute    # defined in RFC3986 3.3
>>
>>   codec            = ( "GCS-SHA256" | ( ptoken | quoted-string ) )
>> ...
>
>
> I wouldn't use angle brackets here; let's leave them for use in places where
> the value is a URI (Link header field and several WebDAV header fields).
>
> Just us token/quoted-sting here.
>
> Also, do not wire parameter names into the ABNF; this mixes syntax with
> semantics.

Thank you for the advice.

Obviously I have used an old-fashioned RFC as a reference when writing
the ABNF (that Stefan probably modified).  I should have looked into a
newer one, such as the Alt-Svc draft.

> Best regards, Julian



-- 
Kazuho Oku

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