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When using apache as a proxy for a number of clients how can I work out the hit rate for the cached items?

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you can calculate the hit ratio by counting the entries in access_log with return code 200 and 304.

  • 200 => no hit (most of the time)
  • 304 => hit (most of the time)

it is not the absolute exact cache hit ratio, but is good enough in most cases.

and some more background info from apache.

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