[squid-users] TCP_MISS_ABORTED/502

[Ben Toms]

Hi Alex,

Which log should those be found?

Can’t see “HTTP Server RESPONSE” in the access.log or cache.log.

Regards,
Ben.

From: squid-users <squid-users-bounces at lists.squid-cache.org> on behalf of Alex Rousskov <rousskov at measurement-factory.com>
Date: Friday, 12 July 2024 at 17:11
To: squid-users at lists.squid-cache.org <squid-users at lists.squid-cache.org>
Subject: Re: [squid-users] TCP_MISS_ABORTED/502
On 2024-07-12 11:38, Ben Toms wrote:
> Think I made the changes Alex requested:
>
> 12/Jul/2024:15:36:31 +0000.640 local.server.ip TCP_MISS_ABORTED/502 3974
> GET https://local.server.fqdn/path/to/file -
> FIRSTUP_PARENT/public.ip.of.public.server text/html
> ERR_READ_ERROR/WITH_SERVER

Thank you for using Squid v6 for this test.

Unfortunately, due to Squid logging bugs, ERR_READ_ERROR/WITH_SERVER
does not always mean what it says. For example, parent Squid could have
closed the child-parent connection prematurely, but there could be other
reasons. A full debugging log should give us more information.


> 2024/07/12 14:57:08.678 kid1| 11,2| Stream.cc(274) sendStartOfMessage:
> HTTP Client REPLY:

This is a child proxy response to the client. We need parent response to
the child proxy. Look for "HTTP Server RESPONSE" lines instead.


HTH,

Alex.



> ---------
>
> HTTP/1.1 502 Bad Gateway
>
> Server: squid/6.6
>
> Mime-Version: 1.0
>
> Date: Fri, 12 Jul 2024 14:57:08 GMT
>
> Content-Type: text/html;charset=utf-8
>
> Content-Length: 3629
>
> X-Squid-Error: ERR_READ_ERROR 0
>
> Vary: Accept-Language
>
> Content-Language: en
>
> Cache-Status: squid.host;detail=mismatch
>
> Via: 1.1 squid.host (squid/6.6)
>
> Connection: keep-alive
>
> ----------
>
> Regards,
>
> Ben.
>
> *From: *squid-users <squid-users-bounces at lists.squid-cache.org> on
> behalf of Amos Jeffries <squid3 at treenet.co.nz>
> *Date: *Friday, 12 July 2024 at 15:22
> *To: *squid-users at lists.squid-cache.org <squid-users at lists.squid-cache.org>
> *Subject: *Re: [squid-users] TCP_MISS_ABORTED/502
>
>
> On 13/07/24 01:52, Alex Rousskov wrote:
>> On 2024-07-12 08:06, Ben Toms wrote:
>>> Seems that my issue is similar to -
>>> https://serverfault.com/questions/1104330/squid-cache-items-behind-basic-authentication <https://serverfault.com/questions/1104330/squid-cache-items-behind-basic-authentication>
>>
>> You are facing up to two problems:
>>
>> 1. Some authenticated responses are not cachable by Squid. Please share
>> HTTP headers of the response in question.
>>
>
> FYI, those can be obtained by configuring squid.conf with
>
>     debug_options 11,2
>
>
> Cheers
> Amos
>
>
>> 2. TCP_MISS_ABORTED/502 errors may delete a being-cached response. These
>> can be bogus errors (essentially Squid logging bugs) or real ones (e.g.,
>> due to communication bugs, misconfiguration, or compatibility problems).
>> I recommend adding %err_code/%err_detail to your logformat and sharing
>> the corresponding access.log lines (obfuscated as needed).
>>
>> Sharing (privately if needed) a pointer to compressed ALL,9 cache.log
>> while reproducing the issue using a single transaction may help us
>> resolve all the unknowns:
>>
>> https://wiki.squid-cache.org/SquidFaq/BugReporting#debugging-a-single-transaction <https://wiki.squid-cache.org/SquidFaq/BugReporting#debugging-a-single-transaction>
>>
>>
>> HTH,
>>
>> Alex.
>>
>>
>
>
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