closest thing that I'm aware of is 

            Simple Hit-Metering and Usage-Limiting for HTTP
            RFC 2227 : standards track
            Mogul, Leach

it's got certain limitations that don't really solve the problem
fully, but it's a good start.. cache vendors don't seem to be picking
it up yet in force, but support for it can really only help your
server.. it's pretty lightweight.

-P

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