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From Joerg Heinicke <>
Subject Re: invalid caching problem
Date Fri, 16 May 2003 14:43:19 GMT
Maybe I'm ignorant, but should the expires header has any influence of a 
re-request server side? I don't know if only Mozilla is so intelligent, but 
for an image with expires header Mozilla avoids to ask again the server. 
It's taken from browser cache. But if I force Mozilla to reload the image, 
it should be reloaded by Cocoon and not taken from Cache. So IMO the expires 
header has no influence on the re-request server side. So there is no 
problem when differing between first-time visit and browser-refresh?

I never read any HTTP header spec ;-)


Jeremy Quinn wrote:
>>> Using <map:parameter name="expires" value="access plus 120 minutes"/>
>>> in a Pipeline, permanently disables validity checking on that Pipeline.
>> does ir really permanently disables the checking or does it only disable
>> the checking for 120 minutes after the first access?
> My belief was that it permanently disables it.
> On closer examination, I am not so sure now ....
> Whereas I though the current time was being compared to the Response 
> Object, now I think it is actually being compared to the response 
> retrieved from the Cache.
> So, you are right, it is only disabled for the time period specified in 
> the Pipeline expire.
>> I think the first one would be a bug and the second one would be the
>> intended behaviour (though I'm not sure).
> Yes, it appears to be intended behaviour.
> But is it the desired one? :)
> WRT disallowing the use of Browser Reload as an override?
> But I do not know if there is a way to tell the difference between the 
> following Requests:
>   Forced-Reload of Browser-cached page
>   First-time visit to a page
>   Poorly implemented Browser not sending the right caching headers
>> You mention a wrong comparison above, can you please give the line
>> number?
> I was wrong, I think.
> retrieve response: 476
> retrieve expires:  492
> comparison:        500
> Sorry if I am wasting your time.
> regards Jeremy


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