How is (document) hit ratio measured?

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How does Web Polygraph determine the document hit
ratio of a given cache?

Does it do one of the following:

a. There is a back channel between polygraph clients &
servers

b. There are extra HTTP headers in the
request/response, and the server returns some
different HTTP header for repeated requests of the
same object (oid).

Tcpdump suggests (b). If so, is this documented
somewhere? How exactly does it compute the hit ratio?

Thanks in advance.

Kinson Ho

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