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Re: #290: Motivate one-year limit for Expires

From: Mark Nottingham <mnot@mnot.net>
Date: Fri, 29 Jul 2011 13:47:45 -0700
Message-Id: <5635FDB8-10C4-4442-8D2C-B0CC709B55B9@mnot.net>
To: HTTP Working Group <ietf-http-wg@w3.org>
Updated proposal:

Remove the requirement in p6 3.3 and replace it with:

Historically, HTTP required the Expires field-value to be no more than a year in the future. While longer freshness lifetimes are no longer prohibited, extremely large values have been demonstrated to cause problems (e.g., clock overflows due to use of 32-bit integers for time values), and most caches will evict a response far sooner than that. Therefore, senders ought not produce them.

Mark Nottingham   http://www.mnot.net/
Received on Friday, 29 July 2011 20:48:19 UTC

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