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Re: My question about client hints

From: Kenji Baheux <kenjibaheux@chromium.org>
Date: Tue, 20 Mar 2018 17:54:24 +0000
Message-ID: <CADWWn7WhgYfC5sgH_XuYAoWgYGehrbTOyOaGxuYkpUep+uAD6Q@mail.gmail.com>
To: Eric Rescorla <ekr@rtfm.com>
Cc: HTTP Working Group <ietf-http-wg@w3.org>
It seems that the JS+cookie approach wouldn't work well for client hints
that might change in between accesses.
Resources that are sent up to the point JS can run and update its
understanding of a client's preferences will be inadequate in various ways.

In particular, this seems concerning for the save-data hint as it might be:

   - OFF initially because the user was on WiFi, or in their home country
   - ON for a subsequent navigation because the user is now on their mobile
   connection, or roaming abroad.

resulting in less than ideal bandwidth usage.

On Tue, Mar 20, 2018 at 5:33 PM Eric Rescorla <ekr@rtfm.com> wrote:

> At today's session I asked the following question:
> Given that you can only send client hints if the site could run JS and set
> a cookie, then
> why can't the site just run JS on first contact, extract this data, and
> store it in a cookie,
> at which point it is available on all previous contacts.
> As far as I can tell, the only difference here is on first contact. What
> am I missing.
> -Ekr
Received on Tuesday, 20 March 2018 17:55:00 UTC

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