[squid-dev] Fix If-None-Match processing and related bug 4169

[Garri Djavadyan]

Hello,

Please review the attached patch prepared for r14958, it fixes the If-
None-Match processing (incorrect logging [1]) and the bug [2] report
4169 depending on the incorrect (IMO) behavior.

An If-None-Match request for a non-matched (ETag) but cached object
should be processed as normal HIT.

[1] http://lists.squid-cache.org/pipermail/squid-users/2016-November/01
3483.html
[2] http://bugs.squid-cache.org/show_bug.cgi?id=4169

Thanks.

Garri
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