On 8 Jan 2014, at 08:58, Massimo B. wrote:
> "If an instance has no `Expires' header but has a `LastModified' header, it 
> becomes stale when its age reaches either `maxAgeFraction' of the time since 
> it was last modified or else the absolute value `maxAge', whichever happens 
> first."
> [...]
> Why is this variable a factor and not absolute time?

If the origin server says "here's the resource you requested, it was
last modified 2 years ago" you might want to cache it for longer than if
the origin server said "it was last modified 1 second ago".

If you want to expire based on absolute time use `maxAge`.


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