[squid-users] TCP_REFRESH_IGNORED/200 ???

Alex Rousskov rousskov at measurement-factory.com
Thu Sep 28 17:51:53 UTC 2017

On 09/28/2017 10:40 AM, EdouardM wrote:

> what's this Squid code "TCP_REFRESH_IGNORED" ?

This recently added result code indicates that Squid tried to refresh
the previously cached response A, but got a response B that was older
than A (as determined by the Date header field). Squid ignored response
B. Squid probably served the response A instead.

This "ignore older responses" logic complies with RFC 7234 section 4
requirement: a cache MUST use the most recent response (as determined by
the Date header field).

Frequent TCP_REFRESH_IGNORED entries may warrant an investigation. You
may be dealing with broken origin servers, unusual race conditions (that
Squid might be mishandling), and/or Squid bugs.

> we checked the page https://wiki.squid-cache.org/SquidFaq/SquidLogs and it's
> not mentioned.

It is now.



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