Re: lifetime of validators

• From: Roy T. Fielding <fielding@avron.ICS.UCI.EDU>
• Date: Thu, 18 Apr 1996 17:11:43 -0700
• To: Jeffrey Mogul <mogul@pa.dec.com>
• Cc: http-caching@pa.dec.com
• Message-Id: <9604181711.aa18344@paris.ics.uci.edu>

>    In order to be legal, a strong opaque validator MUST change whenever
>    the associated entity value changes in any way.  A weak opaque
>    validator SHOULD change whenever the associated entity value changes
>    in a semantically significant way.
> 
>       Note: in order to provide semantically transparent caching, an
>       origin server should avoid reusing a specific strong opaque
>       validator value for two different instances of an entity, or
>       reusing a specific weak opaque validator value for two
>       semantically different instances of an entity.  Caches entries
>       may persist for arbitrarily long periods, regardless of
>       expiration times, so it may be inappropriate to expect that a
>       cache will never again attempt to validate an entry using a
>       validator that it obtained at some point in the past.

okay by me.

.....Roy

Received on Friday, 19 April 1996 00:44:23 UTC