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Re: Problem caching range requests with range_offset_limit

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On 8/10/22 22:43, osy wrote:
I am trying to cache Azure objects. I have SSL bump and the following config:

maximum_object_size 1000 MB
acl azure_storage dstdomain .blob.core.windows.net
range_offset_limit -1 azure_storage

My expectation is that when a request is made with the Range header,
that Squid will request the object starting from the beginning, return
the data when it reaches the range, then keep the connection open and
keep requesting data until the end.

N.B. In the above "keep the connection" should refer to the Squid-to-origin connection, not the user_agent-to-Squid connection.


However, I observe the last part
isn't true: the connection to the server is closed after the proxy
client closes the connection.

2022/08/10 18:55:23.152| 5,3| Read.cc(92) ReadNow:
local=127.0.0.1:3128 remote=127.0.0.1:57075 FD 21 flags=1, size 3644,
retval 0, errno 0
2022/08/10 18:55:23.152| 33,5| Server.cc(147) doClientRead:
local=127.0.0.1:3128 remote=127.0.0.1:57075 FD 21 flags=1 closed?
2022/08/10 18:55:23.152| 33,3| client_side.cc(1418)
connFinishedWithConn: local=127.0.0.1:3128 remote=127.0.0.1:57075 FD
21 flags=1 aborted (half_closed_clients disabled)
2022/08/10 18:55:23.152| 33,3| Pipeline.cc(56) terminateAll: Pipeline
0x149704e80 notify(0) 0x13a817600*3
2022/08/10 18:55:23.152| 90,3| store_client.cc(651) storeUnregister:
storeUnregister: called for 'F43F6204305C4808C2A393C7CC905C16'
2022/08/10 18:55:23.153| 90,3| store_client.cc(764)
CheckQuickAbortIsReasonable: entry=e:d5@0=w1p2V/0x6000038f6d80*6
2022/08/10 18:55:23.153| 90,3| store_client.cc(755)
storePendingNClients: storePendingNClients: returning 0
2022/08/10 18:55:23.153| 90,3| store_client.cc(788)
CheckQuickAbortIsReasonable: mem=0x14a14bcb0
2022/08/10 18:55:23.153| 90,3| store_client.cc(817)
CheckQuickAbortIsReasonable: quick-abort? NO admin configured range
replies to full-download
2022/08/10 18:55:23.153| 33,3| Pipeline.cc(69) popMe: Pipeline
0x149704e80 drop 0x13a817600*3
2022/08/10 18:55:23.153| 33,3| client_side_request.cc(270)
~ClientHttpRequest: httpRequestFree: [url here]

Just to avoid any misunderstanding, the above debugging quote does _not_ show the connection to the origin server being closed. There are many things called "servers" and "clients" in this context. The "Server.cc" above is a Squid task parsing requests from user agents and responding with a replies. It is nearly unrelated to the origin server.

The above trace does not necessarily contradict your configuration and expectations AFAICT. It shows that the user agent closed the connection to Squid, but Squid may have decided to keep going with downloading the response from the origin server ("quick-abort? NO"). Something else could have gone wrong with that download later (or even earlier), of course, but the trace does not show that AFAICT.


HTH,

Alex.



I also tried setting "half_closed_clients on" but that just defers the
error to a write later on. Any advice would be appreciated, thanks!
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