From: Lionel Bouton <lionel-subscription@...>
Date: 2007-08-03T02:14:06+09:00
Subject: Re: net::http and caching files


>
> Just read what 'etag' is.  Do I actually need mtime, if I have etag?

Depends on the server on the other side. Both have roughly the same 
usage ('last_modified' can't be reliably parsed as an accurate date as 
there are servers with inaccurate clocks or bad timezone settings) but 
anyone of them can be used at the server's discretion. If you don't know 
in advance which server you'll fetch information from and which header 
it will respond with, better implement support bor both.

Lionel