[squid-users] TCP_MISS_ABORTED/502

[Alex Rousskov]

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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