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From Alexei Kosut <>
Subject Re: cache verification
Date Tue, 05 Mar 1996 20:06:09 GMT
On Tue, 5 Mar 1996, Paul Richards wrote:

> I think any piece of software that uses caching should adhere to the ttl value
> used in the implementation, in this case Expire and if users are getting out
> of date documents it's the fault of the person who wrote those documents
> because they didn't drop the Expire header, wait the Expire duration for all
> caches to time out and then put up the new document. That's how it *should*

I agree. That's not the problem. The problem is when there *is* no 
Expires header. Currently the proxy module generates its own, based on 
the Last-Modified header (*0.1 is the default), and uses that. The 
probelm is *this* behavior. I agree that when an Expires header is 
present, it should not check, but when one is not, it should always send 
a conditional GET, just to check, since it has no way of knowing. This is 
the way CERN works, and every other proxy I'm aware of.

--// Alexei Kosut // <> // Lefler on IRC --//
-----------------// <> -------// 
"To get the full effect of Pat Buchanan's speeches, they should be
read in the original German." //--------------------------------------

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