[squid-users] TCP_MISS_ABORTED/502

[Alex Rousskov]

On 2024-07-12 12:14, Ben Toms wrote:

> Which log should those be found?

cache.log (if they are present)


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

Sigh. This is one of the reasons I avoid asking folks to study logs 
themselves, even ALL,2 logs...

If that line is not in cache.log, then child Squid probably did not 
receive a response from parent Squid, or could not parse that response. 
A full debugging log should give us more information.

Alex.


> *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 
> <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> <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> <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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