[squid-users] TCP_MISS/304 question

[Amos Jeffries]

On 14/10/2016 2:46 a.m., Yuri Voinov wrote:
> 
> 
> 
> 13.10.2016 19:44, Yuri Voinov пишет:
> 
> 
> 
>> 13.10.2016 19:41, Amos Jeffries пишет:
>>> On 14/10/2016 1:38 a.m., Yuri Voinov wrote:
>>>>
>>>> -----BEGIN PGP SIGNED MESSAGE-----
>>>> Hash: SHA256
>>>>
>>>> Hi gents.
>>>>
>>>> I have very stupid question.
>>>>
>>>> Look at this access.log entry:
>>>>
>>>> 1476236018.506     85 192.168.100.103 TCP_MISS/304 354 GET
>>>> https://www.gazeta.ru/nm2015/gzt/img/logo_footer.png -
>>>> HIER_DIRECT/81.19.72.2 -
>>>>
>>>> I'm see this:
>>>>
>>>> http://wiki.squid-cache.org/SquidFaq/SquidLogs#HTTP_status_codes
>>>>
>>>> Code 304 references to RFC 2616. Ok, opens it:
>>>>
>>>> https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
>>>>
> 
>>> The reference is outdated. Current requirements are defined in
>>> <https://tools.ietf.org/html/rfc7232#section-4.1>
> 
>>> ...
>>>>
>>>> According to RFC 2616, it comes from client's browser cache, make
>>>> revalidation, discover content no changed and return 304 code.
>>>>
>>>> So, it must means (exactly) CLIENT_HIT, right?
>>>>
> 
>>> No. Squid does not receive transactions that would match the meaning of
>>> the tags CLIENT_HIT.
>> Ok.
> 
> 
> 
>>>> My question is:
>>>>
>>>> *Why Squid register this as TCP_MISS/304 in access.log, when logically
>>>> expect TCP_CLIENT_HIT/304?*
> 
>>> This is a MISS on the Squid cache. A 304 from the server delivered to
>>> the client.
>> Ok, 304 delivered. But content - not, right? So, this is HIT - even not
>> Squid's hit, yes?
> In agreement with this (https://tools.ietf.org/html/rfc7232#page-18):
> 

Unknown without seeing the client request headers.

There might be no content in Squid cache at the start, and due to 304
not providing a payload none at the end either.


> 
>>> It might be a CLIENT_IMS_UNMODIFIED or CLIENT_INM_UNMODIFIED if Squid
>>> had codes for those cases.
>> Ok, Squid has?

Squid has TCP_MISS tag, which is used for unknown situations where a
server was involved.

Amos