Re: New Version Notification for draft-cdn-control-header-00.txt

Thanks for working on this! Two comments:

1) Since this header is already using structured headers, could we use a
"for=" parameter instead of the suggested vendor-specific header names? i.e.

  VENDOR1-CDN-Cache-Control: max-age=61
  VENDOR2-CDN-Cache-Control: max-age=62

would become:

  CDN-Cache-Control: for=vendor1; max-age=61, for=vendor2; max-age=62

This would better match the style of Cache-Status and Proxy-Status headers,
IMHO.

2) From the protocol point of view, CDNs are no different than any other
intermediaries, so we should be providing a generic solution that works in
modern cloud deployments with many layers of intermediaries, and not
another special CDN-header. If we define common roles for all the peers,
then we could have something like:

  Cache-Control2: for=reverse_proxy; max-age=5, for=cdn; max-age=60,
for=user_agent; no-store

Thoughts?

Best regards,
Piotr Sikora


On Sun, Jan 17, 2021 at 6:45 PM Mark Nottingham <mnot@mnot.net> wrote:

> [ document author hat on ]
>
> Hi everyone,
>
> We're requested time for discussion of this draft at the upcoming interim.
> We'd like the WG to consider adoption.
>
> Cheers,
>
>
> > On 24 Nov 2020, at 1:01 pm, Mark Nottingham <mnot@mnot.net> wrote:
> >
> > FYI / for discussion.
> >
> >> Begin forwarded message:
> >>
> >> From: internet-drafts@ietf.org
> >> Subject: New Version Notification for draft-cdn-control-header-00.txt
> >> Date: 24 November 2020 at 1:01:02 pm AEDT
> >> To: "Mark Nottingham" <mnot@mnot.net>, "Stephen Ludin" <
> sludin@ludin.org>, "Yuchen Wu" <me@yuchenwu.net>
> >>
> >>
> >> A new version of I-D, draft-cdn-control-header-00.txt
> >> has been successfully submitted by Mark Nottingham and posted to the
> >> IETF repository.
> >>
> >> Name:                draft-cdn-control-header
> >> Revision:    00
> >> Title:               The CDN-Cache-Control HTTP Response Header Field
> >> Document date:       2020-11-23
> >> Group:               Individual Submission
> >> Pages:               7
> >> URL:
> https://www.ietf.org/archive/id/draft-cdn-control-header-00.txt
> >> Status:
> https://datatracker.ietf.org/doc/draft-cdn-control-header/
> >> Html:
> https://www.ietf.org/archive/id/draft-cdn-control-header-00.html
> >> Htmlized:       https://tools.ietf.org/html/draft-cdn-control-header-00
> >>
> >>
> >> Abstract:
> >>   This specification defines an HTTP header field that conveys HTTP
> >>   cache directives to CDN caches.
> >>
> >>
> >>
> >>
> >> Please note that it may take a couple of minutes from the time of
> submission
> >> until the htmlized version and diff are available at tools.ietf.org.
> >>
> >> The IETF Secretariat
> >>
> >>
> >
> > --
> > Mark Nottingham   https://www.mnot.net/
> >
>
> --
> Mark Nottingham   https://www.mnot.net/
>
>
>