Re: [squid-users] Forget all memorized 404s

Markus Meyer wrote:
> Amos Jeffries schrieb:
>>> Force a refresh (using wget, squidclient, or your browser) or set
>>> http://www.squid-cache.org/Doc/config/negative_ttl/ to a sufficiently
>>> low value and reload.
>> The recommended value being zero.
>
> Ok, with this the Squid would not memorize the 404s. But how can I
> prevent it from invalidating cached content in case it's parents go down?
> This is just a kind of rescue plan in case our backend servers have a
> disaster. It happend to me twice now and I want to make sure that the
> proxies are still delivering their content for the short period we need
> to get the backend servers running again.
>

404s can have Cache-Control: and Expires: headers like any other
response. The we server should be able to more accurately set a duration
of 404 than Squid can.

All the negative_ttl does is set a minimum caching time for 4xx and 5xx
issues. Any explicit Expiry info longer than that is expected to be
treated according to RFC and cached.

Amos

-- 
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