"store-stale" sending original "expires" header may be breaking windows update?

[Heiler Bemerguy <heiler.bemerguy@xxxxxxxxxxxxxx>]

Hi folks, what do you think about it?

refresh_pattern -i (microsoft|windowsupdate)\.com.*\.(cab|exe|ms[iup]|dat|zip|[ap]sf|appx(bundle)?|esd|crl)$ 483840 100% 483840 override-expire ignore-reload ignore-no-store store-stale

A request sent to squid:

GET http://download.windowsupdate.com/d/msdownload/update/others/2016/11/23135907_62c440827e79f4ebcb1babac054468802f1be1cd.cab HTTP/1.1
Accept: */*
User-Agent: Windows-Update-Agent
Proxy-Connection: Keep-Alive
Host: download.windowsupdate.com

squid reply to the user:

HTTP/1.1 200 OK
Expires: Thu, 17 Nov 2016 18:00:01 GMT
MSRegion: Latam
Cache-Control: public,max-age=172800
Content-Length: 0
Content-Type: application/vnd.ms-cab-compressed
Last-Modified: Mon, 14 Nov 2016 16:57:44 GMT
Accept-Ranges: bytes
ETag: "0b4d737983ed21:0"
Server: Microsoft-IIS/8.5
X-Powered-By: ASP.NET
X-CID: 7
X-CCC: US
X-MSEdge-Ref: Ref A: A41379B47DAB430595652F948ADA374C Ref B: A3C4FE3E5EFF7E01F424A3DC08B40AF5 Ref C: Tue Dec  6 06:44:10 2016 PST
Date: Tue, 06 Dec 2016 14:44:10 GMT
X-Cache: MISS from proxycache2
Age: 60080
X-Cache: HIT from proxy
Via: 1.1 proxycache2 (squid), 1.1 proxy (squid)
Connection: keep-alive

So.. it's sending a stale object, but it's saying to the user that the object is expired...  is it right? I think windows update is aborting this download everytime:
1481035881.814     78 10.11.0.111 TCP_REFRESH_UNMODIFIED_ABORTED/200 4113 GET http://download.windowsupdate.com/d/msdownload/update/others/2016/11/23135907_62c440827e79f4ebcb1babac054468802f1be1cd.cab - FIRSTUP_PARENT/127.0.0.1 application/vnd.ms-cab-compressed
1481035885.924    100 10.11.0.111 TCP_REFRESH_UNMODIFIED_ABORTED/200 4113 GET http://download.windowsupdate.com/d/msdownload/update/others/2016/11/23135907_62c440827e79f4ebcb1babac054468802f1be1cd.cab - FIRSTUP_PARENT/127.0.0.1 application/vnd.ms-cab-compressed
1481035890.658     86 10.11.0.111 TCP_REFRESH_UNMODIFIED_ABORTED/200 4113 GET http://download.windowsupdate.com/d/msdownload/update/others/2016/11/23135907_62c440827e79f4ebcb1babac054468802f1be1cd.cab - FIRSTUP_PARENT/127.0.0.1 application/vnd.ms-cab-compressed
1481035894.940     78 10.11.0.111 TCP_REFRESH_UNMODIFIED_ABORTED/200 4113 GET http://download.windowsupdate.com/d/msdownload/update/others/2016/11/23135907_62c440827e79f4ebcb1babac054468802f1be1cd.cab - FIRSTUP_PARENT/127.0.0.1 application/vnd.ms-cab-compressed
1481035899.252    119 10.11.0.111 TCP_REFRESH_UNMODIFIED_ABORTED/200 12305 GET http://download.windowsupdate.com/d/msdownload/update/others/2016/11/23135907_62c440827e79f4ebcb1babac054468802f1be1cd.cab - FIRSTUP_PARENT/127.0.0.1 application/vnd.ms-cab-compressed
1481035903.547    132 10.11.0.111 TCP_REFRESH_UNMODIFIED_ABORTED/200 4113 GET http://download.windowsupdate.com/d/msdownload/update/others/2016/11/23135907_62c440827e79f4ebcb1babac054468802f1be1cd.cab - FIRSTUP_PARENT/127.0.0.1 application/vnd.ms-cab-compressed

-- 
Best Regards,

Heiler Bemerguy
Network Manager - CINBESA
55 91 98151-4894/3184-1751

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