[squid-users] Seeking insight into zeros, negative values in log: 2.6.STABLE18

[Henry S. Thompson]

Amos Jeffries writes:

> On 5/08/2016 12:37 a.m., Henry S. Thompson wrote:
>> Thanks for your patience with this, but still not quite getting it.
>> 
>> I thought there were two cases:
>> 
>>   1) Client drops the connection before the interaction is complete ==
>>      log shows HTTP result code 000, almost always size 0 as well;
>> 
>>   2) Interaction completed successfully == HTTP result code as from
>>      cache or remote, size as sent to client.
>> 
>> See below how I can't make that fit with your reply
>
> #1 is correct but incomplete. The 000 status means dropped any time
> before the status to be delivered became known. So while "incomplete" is
> true, there are very short times in the transaction where "incomplete"
> is still true but are logged with non-000 status and size 0.

Right, that's helpful, thanks.

> NP: There are also later times during payload delivery where drop can
> happen so incomplete is still true and both status and size have values.
> Those are impossible to detect in HTTP/1.0, so another reason to upgrade
> to HTTP/1.1 software (Squid-3.2+).

Understood.

> The difference in timing between all these state changes should be a
> very, very small number of milliseconds. Enough to see differently in
> logs sometimes but should not be something to worry about.

Right.

ht
-- 
       Henry S. Thompson, School of Informatics, University of Edinburgh
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                Fax: (44) 131 650-4587, e-mail: ht at inf.ed.ac.uk
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