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Re: URL sometimes reurns empty response

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Hmmmmm. See no issue from my side:

root @ khorne /patch # wget -S http://www.msftconnecttest.com/ncsi.txt
--2017-05-02 19:16:11--  http://www.msftconnecttest.com/ncsi.txt
Connecting to 127.0.0.1:3128... connected.
Proxy request sent, awaiting response...
  HTTP/1.1 200 OK
  Cache-Control: max-age=30,must-revalidate
  Content-Length: 14
  Content-Type: text/plain
  Last-Modified: Fri, 04 Mar 2016 06:55:23 GMT
  ETag: "0x8D343F9F578A7F9"
  Server: Microsoft-IIS/7.5
  x-ms-request-id: 45e06e80-0001-000b-6f15-be91d0000000
  x-ms-version: 2009-09-19
  x-ms-meta-CbModifiedTime: Tue, 01 Mar 2016 21:41:22 GMT
  x-ms-lease-status: unlocked
  x-ms-blob-type: BlockBlob
  X-ECN-P: RD0003FF838204
  Access-Control-Expose-Headers: X-MSEdge-Ref
  Access-Control-Allow-Origin: *
  Timing-Allow-Origin: *
  X-CID: 7
  X-CCC: SE
  X-MSEdge-Ref: Ref A: FFF0B969CF5F48DA856B48165D32542E Ref B:
STOEDGE0510 Ref C: Tue May  2 06:16:14 2017 PST
  X-MSEdge-Ref-OriginShield: Ref A: 9D033F6C12734D3A839C09F1BAFF798E Ref
B: AMS04EDGE0220 Ref C: Thu Apr 27 07:42:11 2017 PST
  Date: Tue, 02 May 2017 13:16:13 GMT
  X-Cache: MISS from khorne
  X-Cache-Lookup: MISS from khorne:3128
  Connection: keep-alive
Length: 14 [text/plain]
Saving to: 'ncsi.txt'

ncsi.txt            100%[===================>]      14  --.-KB/s    in
0s     

2017-05-02 19:16:14 (2.07 MB/s) - 'ncsi.txt' saved [14/14]

root @ khorne /patch # wget -S http://www.msftconnecttest.com/ncsi.txt
--2017-05-02 19:16:32--  http://www.msftconnecttest.com/ncsi.txt
Connecting to 127.0.0.1:3128... connected.
Proxy request sent, awaiting response...
  HTTP/1.1 200 OK
  Cache-Control: max-age=30,must-revalidate
  Content-Length: 14
  Content-Type: text/plain
  Last-Modified: Fri, 04 Mar 2016 06:55:23 GMT
  ETag: "0x8D343F9F578A7F9"
  Server: Microsoft-IIS/7.5
  x-ms-request-id: 45e06e80-0001-000b-6f15-be91d0000000
  x-ms-version: 2009-09-19
  x-ms-meta-CbModifiedTime: Tue, 01 Mar 2016 21:41:22 GMT
  x-ms-lease-status: unlocked
  x-ms-blob-type: BlockBlob
  X-ECN-P: RD0003FF838204
  Access-Control-Expose-Headers: X-MSEdge-Ref
  Access-Control-Allow-Origin: *
  Timing-Allow-Origin: *
  X-CID: 7
  X-CCC: SE
  X-MSEdge-Ref: Ref A: FFF0B969CF5F48DA856B48165D32542E Ref B:
STOEDGE0510 Ref C: Tue May  2 06:16:14 2017 PST
  X-MSEdge-Ref-OriginShield: Ref A: 9D033F6C12734D3A839C09F1BAFF798E Ref
B: AMS04EDGE0220 Ref C: Thu Apr 27 07:42:11 2017 PST
  X-Origin-Date: Tue, 02 May 2017 13:16:13 GMT
  Date: Tue, 02 May 2017 13:16:32 GMT
  X-Cache-Age: 19
  X-Cache: HIT from khorne
  X-Cache-Lookup: HIT from khorne:3128
  Connection: keep-alive
Length: 14 [text/plain]
Saving to: 'ncsi.txt.1'

ncsi.txt.1          100%[===================>]      14  --.-KB/s    in
0s     

2017-05-02 19:16:32 (1.90 MB/s) - 'ncsi.txt.1' saved [14/14]

root @ khorne /patch # wget -S http://www.msftconnecttest.com/ncsi.txt
--2017-05-02 19:18:06--  http://www.msftconnecttest.com/ncsi.txt
Connecting to 127.0.0.1:3128... connected.
Proxy request sent, awaiting response...
  HTTP/1.1 200 OK
  Content-Length: 14
  ETag: "0x8D343F9F578A7F9"
  Cache-Control: max-age=30,must-revalidate
  Content-Type: text/plain
  Last-Modified: Fri, 04 Mar 2016 06:55:23 GMT
  Server: Microsoft-IIS/7.5
  x-ms-request-id: 45e06e80-0001-000b-6f15-be91d0000000
  x-ms-version: 2009-09-19
  x-ms-meta-CbModifiedTime: Tue, 01 Mar 2016 21:41:22 GMT
  x-ms-lease-status: unlocked
  x-ms-blob-type: BlockBlob
  X-ECN-P: RD0003FF838204
  Access-Control-Expose-Headers: X-MSEdge-Ref
  Access-Control-Allow-Origin: *
  Timing-Allow-Origin: *
  X-CID: 7
  X-CCC: SE
  X-MSEdge-Ref: Ref A: 1F682D6F87124BF28456EB937B49B208 Ref B:
STOSCHEDGE0116 Ref C: Tue May  2 06:18:06 2017 PST
  X-MSEdge-Ref-OriginShield: Ref A: 9D033F6C12734D3A839C09F1BAFF798E Ref
B: AMS04EDGE0220 Ref C: Thu Apr 27 07:42:11 2017 PST
  Vary: Accept-Encoding
  X-Origin-Date: Tue, 02 May 2017 13:18:05 GMT
  Date: Tue, 02 May 2017 13:18:06 GMT
  X-Cache-Age: 1
  X-Cache: HIT from khorne
  X-Cache-Lookup: HIT from khorne:3128
  Connection: keep-alive
Length: 14 [text/plain]
Saving to: 'ncsi.txt.2'

ncsi.txt.2          100%[===================>]      14  --.-KB/s    in
0s     

2017-05-02 19:18:06 (2.03 MB/s) - 'ncsi.txt.2' saved [14/14]

Seems correct. Will dig more.


02.05.2017 19:15, Ralf Hildebrandt пишет:
> * Ralf Hildebrandt <Ralf.Hildebrandt@xxxxxxxxxx>:
>
>> It seems that squid is returning an incorrect Content-Lenght: header 
>> while the revalidation is still fresh/ongoing.
>>
>> I haven't yet tried tcpdumping the response to check if the 14 bytes
>> do indeed contain the correct string.
> And voila - here we go (Content-Length: 0 but squid sends 14 bytes of excess data: "Microsoft NCSI")
>
> 15:10:31.741436 IP proxy-cvk-1.charite.de.http-alt > vsw-it-nw-10.54228: Flags [P.], seq 1:952, ack 156, win 235, options [nop,nop,TS val 126939588 ecr 1696144349], length 951: HTTP: HTTP/1.1 200 OK
> E...cR@.?....*...*......V?.....5....U......
> ....e...HTTP/1.1 200 OK
> Cache-Control: max-age=30,must-revalidate
> Content-Length: 0
> Content-Type: text/plain
> Last-Modified: Fri, 04 Mar 2016 06:55:23 GMT
> ETag: "0x8D343F9F578A7F9"
> Server: Microsoft-IIS/7.5
> x-ms-request-id: 6508a999-0001-0016-4fbc-c0483a000000
> x-ms-version: 2009-09-19
> x-ms-meta-CbModifiedTime: Tue, 01 Mar 2016 21:41:22 GMT
> x-ms-lease-status: unlocked
> x-ms-blob-type: BlockBlob
> X-ECN-P: RD0003FF838204
> Access-Control-Expose-Headers: X-MSEdge-Ref
> Access-Control-Allow-Origin: *
> Timing-Allow-Origin: *
> X-CID: 7
> X-CCC: US
> X-MSEdge-Ref: Ref A: 2C6BD6F103A24795AE6784C3DC22E5F5 Ref B: BER30EDGE0115 Ref C: Tue May  2 06:10:31 2017 PST
> X-MSEdge-Ref-OriginShield: Ref A: 5A9FC4FE82DC4E2DB26E51E59C50B50A Ref B: AMS04EDGE0506 Ref C: Sat Apr 29 05:30:12 2017 PST
> Date: Tue, 02 May 2017 13:10:31 GMT
> Age: 0
> X-Cache: HIT from proxy-cvk-1
> Via: 1.1 proxy-cvk-1 (squid/5.0.0-20170429-r15127)
> Connection: keep-alive
>
> Microsoft NCSI
> 15:10:31.741454 IP vsw-it-nw-10.54228 > proxy-cvk-1.charite.de.http-alt: Flags [.], ack 952, win 243, options [nop,nop,TS val 1696144352 ecr 126939588], length 0
> E..4._@.@..=.*...*.........5V?.G.....O.....
> e.......
>

-- 
Bugs to the Future

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