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From Graham Leggett <>
Subject Re: mod_disk_cache summarization
Date Sun, 29 Oct 2006 12:16:15 GMT
Henrik Nordstrom wrote:

> How ETag:s is generated is extremely server dependent, and not
> guaranteed to be unique across different URLs. You can not at all count
> on two files having the same ETag but different URLs to be the same
> file, unless you also is responsible for the server providing all the
> URLs in question and know that the server guarantees this behavior of
> ETag beyond what the HTTP specification says.

Exactly - this is the case here.

The problem that is being solved is when a server serves the same file, 
within the same server, but at multiple different URLs. The file in this 
case is interpreted as a different file each time, and is cached over 
and over again.

Obviously such a feature wouldn't be something you would switch on by 
default, and the admin would be expected to know what he is doing when 
they switch this behaviour on.


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