- From: N.G.Smith <ngs@sesame.hensa.ac.uk>
- Date: Fri, 01 Sep 1995 09:42:57 +0000
- To: www-talk@w3.org
>Is there a recommended caching policy for proxies? The algorithm that >suggests itself to me is to check the expiry date for the cached document >and if it's still in date use it, otherwise send a conditional GET. If every document arrived with an expiry date then this would be fine. Unfortunately precious few do and so other heuristic rules are often used to guess when a conditional GET is required. The rule most commonly used is based on a proportion of the time since the document was Last-Modified. This assumes that a recently modified document is likely to change again soon, while a document that has not been touched in ages will remain fairly static. A maximum upper bound is often used to make sure that conditional GETs happen on a regular basis even if the Last-Modified date was a long time ago. >I assume that there have been discussions of this: is there a reference to >a summary anywhere? > >Colman Discussion of these issues used to happen on www-proxy@w3.org, but the list of Mailing Lists at W3C [1] suggests that www-proxy is `previous' rather than `current'. Archives of the list only exist to January 1995. Has the list been discontinued? Neil Smith HENSA Unix - - - - - - - - - - - - - - - - - - - - [1] http://www.w3.org/hypertext/WWW/Mail/Lists.html
Received on Friday, 1 September 1995 05:42:58 UTC