[SQU] Asking squid for an object only if cached

Is there any way (some extra header ??) to force a GET to only by served if
the object is in cache ??
I'm talking in doing this in the client side, i know this is possible in the
server side denying the "miss_access".

Something like the "no-cache", in the oposite way 8)

TIA.

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  Pedro Ribeiro
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