I want have "Last-modified:" in HTTP/1.0 headers

guenther.fischer@hrz.tu-chemnitz.de (Guenther Fischer)
From: guenther.fischer@hrz.tu-chemnitz.de (Guenther Fischer)
Message-id: <9311121726.AA05941@flash1.hrz.tu-chemnitz.de>
Subject: I want have "Last-modified:" in HTTP/1.0 headers
To: www-talk@nxoc01.cern.ch
Date: Fri, 12 Nov 1993 18:26:41 +0100 (MET)
Reply-To: guenther.fischer@hrz.tu-chemnitz.de
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I've set up a simple cache server based on Tony Sanders plexus 3.0.

I'll give this work to a student to make it better - my own time slices
for such a work are too small.

To do this right I need some informations from "real" servers.

 - Tony has give me the Last-Modified: header line, but I need this from
   other servers too - please HELP
 - Tony has give me the HEAD command - it'a a small work in the server
   and better than do GET and break the connection

On the client side I need the WWW_html_gateway definition like in Mosaic -
I hope other clients have th same feature.

What I've done till now:

- I only cache HTTP/1.0 servers and I configure a server list to cache.
  For other servers it works as a put throught gateway.
- I also can configure types of documents to cache.
- I count using for caching algorithsm

What we will do next:


- reGET documents after a resonable time (configurable for types - I think
  gifs have another TTL than htmls ...

  (here I need the Last-modified: - Please - I think it's more than the Date:
  all HTTP/1.0 servers give me. HEAD would help)

  So we could:
	if ( TimeToLive is "OUT" )  # after 1 day or so ...
		&reGET(...) unless &HEAD_is_uptodate();

Tool to clean the cache:

- walk throught the cache and decide to
	- hold or (HEAD says up to date)
	- reget or (HEAD says out of date)
	- remove from cache. (documents with small usage)

  Do this at a nice time (night or weekend or ...)

SERVER-IMPLEMENTORS! give me the needed information.

Name:      Guenther Fischer
Institute: TU Chemnitz, Universitaetsrechenzentrum
Phone:     0371 668 361
mail:      fischer@hrz.tu-chemnitz.de