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Re: draft-snell-http-prefer-17 feedback

From: Barry Leiba <barryleiba@computer.org>
Date: Tue, 4 Dec 2012 18:08:51 -0500
Message-ID: <CAC4RtVAQs3R+W8_GxX8+ODSp+VK9KLH4F1zX1=8Ymmsco3o8cA@mail.gmail.com>
To: Martin Thomson <martin.thomson@gmail.com>
Cc: Julian Reschke <julian.reschke@gmx.de>, HTTP Working Group <ietf-http-wg@w3.org>, James M Snell <jasnell@gmail.com>, Mark Nottingham <mnot@mnot.net>
>>>    Another option available to clients is to utilize Request URI query-
>>>    string parameters to express preferences.  Doing so, however, results
>>>    in a variety of issues affecting the cacheability of responses.
...
> If the intent is to retrieve:
>   http://example.com/foo
> with prefer: wait=5, then asking for
>   http://example.com/foo?wait=5
> will result in a cache entry against the latter URI, just as
>   http://example.com/foo?wait=3
> will create another cache entry that are all equally useless to the
> requester pulling down the "unmodified" URI.
>
> Any change needs to be aware of the strict interpretation, but make
> this implication obvious.

How about this:

OLD
Doing so, however, results in a variety of issues affecting the
cacheability of responses.

NEW
But any mechanism that alters the URI can have undesirable effects,
such as when caches record the altered URI.

Barry
Received on Tuesday, 4 December 2012 23:09:20 GMT

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