[squid-users] TCP_MISS only

[Andy Armstrong]

Hi,

Okay – but what happens if you are communicating with a non REST endpoint. Consider a Web services endpoint for example where a request is only interacted with via POST but the operation for example may frequently be a read based function akin to a HTTP GET? Is Squid just simply not going to help cache those requests? It is only helpful for more strict alignment to REST principles?

Kind regards,

Andy Armstrong
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From: squid-users <squid-users-bounces at lists.squid-cache.org> on behalf of Amos Jeffries <squid3 at treenet.co.nz>
Date: Tuesday, 27 September 2022 at 19:45
To: squid-users at lists.squid-cache.org <squid-users at lists.squid-cache.org>
Subject: [EXTERNAL] Re: [squid-users] TCP_MISS only
On 27/09/22 23:01, Andy Armstrong wrote:
> Hi Alex,
>
> That makes a lot of sense, I don’t know how I overlooked that – thank
> you. I also agree, logically caching a 201 response makes little sense,
> and it was just an example I had that was easy to try so I used that.
>
> I just altered the HTTP Return code so it sent 200 instead of 201, and
> the result is sadly the same, I get many, many lines like this:
>

Unfortunately that is not enough. POST method is also not cacheable by
default. See <https://www.rfc-editor.org/rfc/rfc9110#section-9.3.3  >

Consider what would happen when two clients POST different sets of data
to the same URL.  Which one should the cache handle *instead* of letting
it be delivered to a server?


> 1664272638.44310107 10.1.1.70 TCP_MISS/200 275 POST
> http://192.168.0.2:3001/InternalCommunicationServices/message/email   -
> HIER_DIRECT/192.168.0.2 application/json
>
> My suspicion is still that my refresh_pattern is wrong:
>
> refresh_pattern -i http://129.168.0.2:3001%5C/.*   10080 100% 43200
> override-lastmod
>

refresh_pattern directive does not make things cacheable when they are
not. It can only extend or shrink cacheability times.


HTH
Amos
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