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dIone_24797's avatar
dIone_24797
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Nov 14, 2013

One Connect not keeping connection open on HTTP 204 No Content

We have an application that returns a 'HTTP 204 No Content' response on 99% of all requests. These connections are being kept open and reused on the client side of the F5. The problem is the Load B...
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IheartF5_45022's avatar
IheartF5_45022
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My reading of that RFC is not that the connection should be closed after a 204, rather that the 204 response is terminated (potentially leaving the connection available to be re-used) - I don't see that it varies the Keeaplive behaviour at all from say a 200.

 

dIone_24797's avatar
dIone_24797
Icon for Nimbostratus rankNimbostratus
Nov 18, 2013
It is certainly unclear in the RFC. Our F5 is closing the connection on every 204 on the server side. Here is a dump of the traffic flow showing the close after every 204. No. Time Source Destination Protocol Length Info 119 0.103542 173.241.249.22 10.130.3.15 TCP 78 13330 > http [SYN] Seq=0 Win=4380 Len=0 MSS=1460 WS=1 TSval=940561079 TSecr=0 SACK_PERM=1 Frame 119: 78 bytes on wire (624 bits), 78 bytes captured (624 bits) Ethernet II, Src: F5Networ_32:d6:87 (00:23:e9:32:d6:87), Dst: Vmware_8e:21:d2 (00:50:56:8e:21:d2) Internet Protocol Version 4, Src: 173.241.249.22 (173.241.249.22), Dst: 10.130.3.15 (10.130.3.15) Transmission Control Protocol, Src Port: 13330 (13330), Dst Port: http (80), Seq: 0, Len: 0 No. Time Source Destination Protocol Length Info 120 0.103552 10.130.3.15 173.241.249.22 TCP 62 http > 13330 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1460 WS=1024 Frame 120: 62 bytes on wire (496 bits), 62 bytes captured (496 bits) Ethernet II, Src: Vmware_8e:21:d2 (00:50:56:8e:21:d2), Dst: F5Networ_32:d6:87 (00:23:e9:32:d6:87) Internet Protocol Version 4, Src: 10.130.3.15 (10.130.3.15), Dst: 173.241.249.22 (173.241.249.22) Transmission Control Protocol, Src Port: http (80), Dst Port: 13330 (13330), Seq: 0, Ack: 1, Len: 0 No. Time Source Destination Protocol Length Info 121 0.104006 173.241.249.22 10.130.3.15 TCP 60 13330 > http [ACK] Seq=1 Ack=1 Win=4380 Len=0 Frame 121: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) Ethernet II, Src: F5Networ_32:d6:87 (00:23:e9:32:d6:87), Dst: Vmware_8e:21:d2 (00:50:56:8e:21:d2) Internet Protocol Version 4, Src: 173.241.249.22 (173.241.249.22), Dst: 10.130.3.15 (10.130.3.15) Transmission Control Protocol, Src Port: 13330 (13330), Dst Port: http (80), Seq: 1, Ack: 1, Len: 0 No. Time Source Destination Protocol Length Info 123 0.105814 173.241.249.22 10.130.3.15 HTTP 908 POST / HTTP/1.1 (application/octet-stream) Frame 123: 908 bytes on wire (7264 bits), 908 bytes captured (7264 bits) Ethernet II, Src: F5Networ_32:d6:87 (00:23:e9:32:d6:87), Dst: Vmware_8e:21:d2 (00:50:56:8e:21:d2) Internet Protocol Version 4, Src: 173.241.249.22 (173.241.249.22), Dst: 10.130.3.15 (10.130.3.15) Transmission Control Protocol, Src Port: 13330 (13330), Dst Port: http (80), Seq: 1, Ack: 1, Len: 854 Hypertext Transfer Protocol Media Type No. Time Source Destination Protocol Length Info 124 0.105830 10.130.3.15 173.241.249.22 TCP 54 http > 13330 [ACK] Seq=1 Ack=855 Win=8192 Len=0 Frame 124: 54 bytes on wire (432 bits), 54 bytes captured (432 bits) Ethernet II, Src: Vmware_8e:21:d2 (00:50:56:8e:21:d2), Dst: F5Networ_32:d6:87 (00:23:e9:32:d6:87) Internet Protocol Version 4, Src: 10.130.3.15 (10.130.3.15), Dst: 173.241.249.22 (173.241.249.22) Transmission Control Protocol, Src Port: http (80), Dst Port: 13330 (13330), Seq: 1, Ack: 855, Len: 0 No. Time Source Destination Protocol Length Info 126 0.113417 10.130.3.15 173.241.249.22 HTTP 185 HTTP/1.1 204 No Content Frame 126: 185 bytes on wire (1480 bits), 185 bytes captured (1480 bits) Ethernet II, Src: Vmware_8e:21:d2 (00:50:56:8e:21:d2), Dst: F5Networ_32:d6:87 (00:23:e9:32:d6:87) Internet Protocol Version 4, Src: 10.130.3.15 (10.130.3.15), Dst: 173.241.249.22 (173.241.249.22) Transmission Control Protocol, Src Port: http (80), Dst Port: 13330 (13330), Seq: 1, Ack: 855, Len: 131 Hypertext Transfer Protocol No. Time Source Destination Protocol Length Info 127 0.114416 173.241.249.22 10.130.3.15 TCP 60 13330 > http [ACK] Seq=855 Ack=132 Win=4511 Len=0 Frame 127: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) Ethernet II, Src: F5Networ_32:d6:87 (00:23:e9:32:d6:87), Dst: Vmware_8e:21:d2 (00:50:56:8e:21:d2) Internet Protocol Version 4, Src: 173.241.249.22 (173.241.249.22), Dst: 10.130.3.15 (10.130.3.15) Transmission Control Protocol, Src Port: 13330 (13330), Dst Port: http (80), Seq: 855, Ack: 132, Len: 0 No. Time Source Destination Protocol Length Info 141 0.122574 173.241.249.22 10.130.3.15 TCP 60 13330 > http [FIN, ACK] Seq=855 Ack=132 Win=4511 Len=0 Frame 141: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) Ethernet II, Src: F5Networ_32:d6:87 (00:23:e9:32:d6:87), Dst: Vmware_8e:21:d2 (00:50:56:8e:21:d2) Internet Protocol Version 4, Src: 173.241.249.22 (173.241.249.22), Dst: 10.130.3.15 (10.130.3.15) Transmission Control Protocol, Src Port: 13330 (13330), Dst Port: http (80), Seq: 855, Ack: 132, Len: 0 No. Time Source Destination Protocol Length Info 142 0.124206 10.130.3.15 173.241.249.22 TCP 54 http > 13330 [FIN, ACK] Seq=132 Ack=856 Win=8192 Len=0 Frame 142: 54 bytes on wire (432 bits), 54 bytes captured (432 bits) Ethernet II, Src: Vmware_8e:21:d2 (00:50:56:8e:21:d2), Dst: F5Networ_32:d6:87 (00:23:e9:32:d6:87) Internet Protocol Version 4, Src: 10.130.3.15 (10.130.3.15), Dst: 173.241.249.22 (173.241.249.22) Transmission Control Protocol, Src Port: http (80), Dst Port: 13330 (13330), Seq: 132, Ack: 856, Len: 0 No. Time Source Destination Protocol Length Info 143 0.124366 173.241.249.22 10.130.3.15 TCP 60 13330 > http [ACK] Seq=856 Ack=133 Win=4511 Len=0 Frame 143: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) Ethernet II, Src: F5Networ_32:d6:87 (00:23:e9:32:d6:87), Dst: Vmware_8e:21:d2 (00:50:56:8e:21:d2) Internet Protocol Version 4, Src: 173.241.249.22 (173.241.249.22), Dst: 10.130.3.15 (10.130.3.15) Transmission Control Protocol, Src Port: 13330 (13330), Dst Port: http (80), Seq: 856, Ack: 133, Len: 0