- From: John Franks <john@math.nwu.edu>
- Date: Wed, 6 Sep 1995 08:45:05 -0500 (CDT)
- To: Shel Kaphan <sjk@amazon.com>
- Cc: mogul@pa.dec.com, http-wg%cuckoo.hpl.hp.com@hplb.hpl.hp.com
According to Shel Kaphan: > > Jeffrey Mogul writes: > ... > > > 2. Cache this object but always validate before using > > (i.e., "Expires: 1 January 1900") > > I see. This actually gives a reasonable meaning to this construct. > This meaning seems better than simply "don't cache this", and works well with > GET if-<whatever>. With plain GET it is equivalent to not caching. > ... This usage encodes some very non-intuitive semantics in the Expires: heading. If you want to tell the proxy to cache a document but always validate it then create a header or Pragma to do that. Trying to encode this request in an otherwise meaningless variant of an existing header is a mistake. This will inevitably lead to confusion because most people already think they know what Expires: means and they have a right to think that. John Franks
Received on Wednesday, 6 September 1995 06:48:07 UTC