cache-digests

hi all,

my upstream provider has configured their squid proxy server with
cache-digests option. how do i know that my squid server is exchanging
digests with the provider? do i still need to use ICP if i go full
cache-digests? how do i turn off ICP in favor of cache-digests?

thanks!

-- 
francis vidal	university of st. la salle, bacolod city, philippines
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