Reference manual for squid's configuraiton directives
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Normally Squid tries to use parents for most requests. If you for some
reason like it to first try going direct and only use a parent if
going direct fails set this to on.
By combining nonhierarchical_direct off and prefer_direct on you
can set up Squid to use a parent as a backup path if going direct
fails.
Note: If you want Squid to use parents for all requests see
the never_direct directive. prefer_direct only modifies how Squid
acts on cacheable requests.
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