[squid-users] Squid Reverse Proxy and WebDAV caching

Wed Aug 30 10:17:06 UTC 2017

Hello Amos,

This morning, for some reasons, I can't reproduce the Hits in the memory.
Squid is only routed for tenant.sharepoint.com so I don't know what I was Hitting yesterday.

But I have collected extended info. 
I repeatedly loaded the same .jpg file several times.
Always a Miss (high latency to access the file).
Information below:

Logs from the client (by Fiddler)
-------------------------------------------------------------------------
GET /sites/Marketing/Shared%20Documents/test_img_1.jpg HTTP/1.1
Cache-Control: no-cache
Connection: Keep-Alive
Pragma: no-cache
User-Agent: Microsoft-WebDAV-MiniRedir/10.0.14393
translate: f
Host: tenant.sharepoint.com
Cookie: FedAuth=*

HTTP/1.1 200 OK
Cache-Control: private,max-age=0
Content-Length: 1708509
Content-Type: image/jpeg
Expires: Tue, 15 Aug 2017 09:53:27 GMT
Last-Modified: Tue, 29 Aug 2017 14:06:14 GMT
Accept-Ranges: bytes
ETag: "{852B897C-67C8-4620-AC40-53FB915EB62D},7"
P3P: CP="ALL IND DSP COR ADM CONo CUR CUSo IVAo IVDo PSA PSD TAI TELo OUR SAMo CNT COM INT NAV ONL PHY PRE PUR UNI"
Set-Cookie: rtFa=*; domain=sharepoint.com; path=/; secure; HttpOnly
Set-Cookie: FedAuth=*; path=/; secure; HttpOnly
Set-Cookie: rtFa=*; domain=sharepoint.com; path=/; secure; HttpOnly
Set-Cookie: FedAuth=*; path=/; secure; HttpOnly
X-SharePointHealthScore: 0
ResourceTag: rt:852B897C-67C8-4620-AC40-53FB915EB62D at 00000000007
Public-Extension: http://schemas.microsoft.com/repl-2
SPRequestGuid: c24b149e-009e-4000-7792-b7ee64e3b853
request-id: c24b149e-009e-4000-7792-b7ee64e3b853
Strict-Transport-Security: max-age=31536000
X-FRAME-OPTIONS: SAMEORIGIN
SPRequestDuration: 320
SPIisLatency: 6
X-Powered-By: ASP.NET
MicrosoftSharePointTeamServices: 16.0.0.6823
X-Content-Type-Options: nosniff
X-MS-InvokeApp: 1; RequireReadOnly
X-MSEdge-Ref: Ref A: 5BF5463E978A400CB13978F6A380BACF Ref B: AMS04EDGE0816 Ref C: 2017-08-30T09:53:27Z
Date: Wed, 30 Aug 2017 09:53:26 GMT
X-Cache: MISS from squidserver.local
Via: 1.1 squidserver.local (squid/3.5.26)
Connection: keep-alive
-------------------------------------------------------------------------

Log from the Squid server - cache.log
-------------------------------------------------------------------------
----------
2017/08/30 10:53:10.401 kid1| 11,2| http.cc(2230) sendRequest: HTTP Server local=123.123.123.123:54129 remote=13.107.6.151:443 FD 22 flags=1
2017/08/30 10:53:10.401 kid1| 11,2| http.cc(2231) sendRequest: HTTP Server REQUEST:
----------
GET /sites/Marketing/Shared%20Documents/test_img_1.jpg HTTP/1.1
Pragma: no-cache
User-Agent: Microsoft-WebDAV-MiniRedir/10.0.14393
Translate: f
Cookie: FedAuth=*
Host: tenant.sharepoint.com
Via: 1.1 sharepoint.virtualdesk.cloud (squid/3.5.26)
Surrogate-Capability: sharepoint.virtualdesk.cloud="Surrogate/1.0"
X-Forwarded-For: 92.222.48.79
Cache-Control: no-cache
Connection: keep-alive

----------
2017/08/30 10:53:10.765 kid1| ctx: enter level  0: 'https://olicomp.sharepoint.com/sites/Marketing/Shared%20Documents/test_img_1.jpg'
2017/08/30 10:53:10.765 kid1| 11,2| http.cc(735) processReplyHeader: HTTP Server local=123.123.123.123:54129 remote=13.107.6.151:443 FD 22 flags=1
2017/08/30 10:53:10.765 kid1| 11,2| http.cc(736) processReplyHeader: HTTP Server REPLY:
---------
HTTP/1.1 200 OK
Cache-Control: private,max-age=0
Content-Length: 1708509
Content-Type: image/jpeg
Expires: Tue, 15 Aug 2017 09:53:27 GMT
Last-Modified: Tue, 29 Aug 2017 14:06:14 GMT
Accept-Ranges: bytes
ETag: "{852B897C-67C8-4620-AC40-53FB915EB62D},7"
P3P: CP="ALL IND DSP COR ADM CONo CUR CUSo IVAo IVDo PSA PSD TAI TELo OUR SAMo CNT COM INT NAV ONL PHY PRE PUR UNI"
Set-Cookie: rtFa=*; domain=sharepoint.com; path=/; secure; HttpOnly
Set-Cookie: FedAuth=*=; path=/; secure; HttpOnly
Set-Cookie: rtFa=*; domain=sharepoint.com; path=/; secure; HttpOnly
Set-Cookie: FedAuth=*=; path=/; secure; HttpOnly
X-SharePointHealthScore: 0
ResourceTag: rt:852B897C-67C8-4620-AC40-53FB915EB62D at 00000000007
Public-Extension: http://schemas.microsoft.com/repl-2
SPRequestGuid: c24b149e-009e-4000-7792-b7ee64e3b853
request-id: c24b149e-009e-4000-7792-b7ee64e3b853
Strict-Transport-Security: max-age=31536000
X-FRAME-OPTIONS: SAMEORIGIN
SPRequestDuration: 320
SPIisLatency: 6
X-Powered-By: ASP.NET
MicrosoftSharePointTeamServices: 16.0.0.6823
X-Content-Type-Options: nosniff
X-MS-InvokeApp: 1; RequireReadOnly
X-MSEdge-Ref: Ref A: 5BF5463E978A400CB13978F6A380BACF Ref B: AMS04EDGE0816 Ref C: 2017-08-30T09:53:27Z
Date: Wed, 30 Aug 2017 09:53:26 GMT
-------------------------------------------------------------------------

Log from the Squid server - access.log
-------------------------------------------------------------------------
TCP_MISS/200 1712549 GET https://tenant.sharepoint.com/sites/Marketing/Shared%20Documents/test_img_1.jpg - FIRSTUP_PARENT/13.107.6.151 image/jpeg

Any help for the analysis would be welcome.

Regards,
Olivier MARCHETTA