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Originally Posted by theman
i just ran ntlworld though that site and it said they are stale
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The analysis is not saying that the actual object
is stale, more accurately that browsers and caches will
treat the homepage html object as being stale and so always fetch a new copy every time it is accessed. ntl have done this by setting a cookie on the homepage which effectively makes it uncacheable.
The gifs have Last-Modified headers on and so will be cached and verified according to age.