[squid-users] Yet another store_id question HIT MISS

[Omid Kosari]

Amos Jeffries wrote
> On 18/08/2016 1:43 a.m., Omid Kosari wrote:
>> Why following link is HIT
>> 
>> X-Cache:"HIT from cache1"
>> X-Cache-Lookup:"HIT from cache1:3128"
>> 
>> 
>> http://igcdn-photos-c-a.akamaihd.net/hphotos-ak-xaf1/t51.2885-15/s150x150/e35/13649137_1547514802224163_950421795_n.jpg
>> 
>> but this one is MISS
>> 
>> http://igcdn-photos-a-a.akamaihd.net/hphotos-ak-xaf1/t51.2885-15/s150x150/e35/13649137_1547514802224163_950421795_n.jpg
>> 
> 
> Because your override-expire tells Squid to ignore the
> Cache-Control:max-age expiry details - instead to treat anything 10080
> seconds old as expired.
> 
> Then the override-last-mod tells Squid to ignore the Last-Modified
> header, instead to treat everything arriving as being 10080 seconds old.
> 
> When combined they mean that objects are only cacheable for the
> remainder of the first second after arrival. When that 0-1 second is
> over they are identified as being stale and require revalidation to be
> used.
> 
> Your options also tell Squid to ignore revalidation ...
>  You see where this is going?
> 
> 
> It is most often a bad idea to override cache controls coming from the
> server. refresh_pattern is a way to work around broken services or those
> which do not send sufficient cache-controls to cache properly. Use with
> great care and caution.
> 
> Amos
> 
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Thanks . i have completely removed that refresh_pattern line but still same
result .



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