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Re: Tracking hits without cache-busting

From: Daniel LaLiberte <liberte@w3.org>
Date: Fri, 25 Jun 1999 08:41:46 -0400 (EDT)
Message-ID: <14195.30986.328501.750927@alceste.w3.org>
To: mcmanus@appliedtheory.com
Cc: danielh@econ.ag.gov, www-talk@w3.org
Patrick McManus writes:
 >             Simple Hit-Metering and Usage-Limiting for HTTP
 > it's got certain limitations that don't really solve the problem
 > fully, but it's a good start.. cache vendors don't seem to be picking
 > it up yet in force, but support for it can really only help your
 > server.. it's pretty lightweight.

In general, a server can't force a cache to do anything it doesn't want
to do regarding hit metering - if the cache never talks to the server
again, what choice does the server have?

But a server might only send out documents in the first place to clients 
and proxies that it detects as being compliant somehow.  That would most 
likely be a rather self defeating policy however.

One workaround might be to send out all documents with the following header:

  Cache-Control: must-revalidate, maxage=0

Then compliant clients should always make If-modified-since requests to
the origin server.   I'm using this at hypernews.org, but not for hit
counting - just because any message page might have a new reply.

But IE 5 might have a bug regarding this must-revalidate feature: it
doesn't redisplay a page when you revisit it from your history with Back
and Forward keys until you hit enter in the location field, or something
like that.

Daniel LaLiberte
Received on Friday, 25 June 1999 08:41:50 UTC

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