I noticed following behaviour of curl_easy_perform when server
terminates connection after sending response to curl client.
Case1: curl_easy_perform returns immediately, and detects broken
connection at the time of next request.
It then re-establishes the connection and retrieve page successfully.
Whole process takes around 220ms (200ms for TCP connection + SSL
Handshake, 8 ms for http response)
Case2: curl_easy_perform is taking around 900ms to sec to return.
In this case too, I see server returned response followed by TCP FIN
immediately.
All termination packet flow is same as of case1.
Still curl_easy_perform is taking 800ms further to return.
Please advice any work around to deal with this.
Case2 flow: 900ms return from curel_easy_perform, actually server
returns response immediately in 8ms.
Req 2245 11:01:12.121 203.243.24.23 172.206.36.76
TLSv1 Application Data
2246 11:01:12.122 203.243.24.23 172.206.36.76
TLSv1 [TCP Out-Of-Order] Application Data
Resp 2247 11:01:12.128 172.206.36.76 203.243.24.23
TLSv1 Application Data
2248 11:01:12.128 172.206.36.76 203.243.24.23 TCP
https > 57468 [FIN, ACK] Seq=106247 Ack=22273 Win=26652 Len=0
2249 11:01:12.128 172.206.36.76 203.243.24.23
TLSv1 [TCP Out-Of-Order] Application Data
2250 11:01:12.128 172.206.36.76 203.243.24.23 TCP
https > 57468 [FIN, ACK] Seq=106247 Ack=22273 Win=26652 Len=0
2251 11:01:12.128 203.243.24.23 172.206.36.76 TCP
57468 > https [ACK] Seq=22273 Ack=106247 Win=64128 Len=0
2252 11:01:12.128 203.243.24.23 172.206.36.76 TCP
[TCP Dup ACK 2251#1] 57468 > https [ACK] Seq=22273 Ack=106247
Win=64128 Len=0
2253 11:01:12.129 203.243.24.23 172.206.36.76
TLSv1 Encrypted Alert
2254 11:01:12.129 203.243.24.23 172.206.36.76
TLSv1 [TCP Out-Of-Order] Encrypted Alert
2255 11:01:12.130 203.243.24.23 172.206.36.76 TCP
57468 > https [FIN, ACK] Seq=22302 Ack=106248 Win=64128 Len=0
2256 11:01:12.130 203.243.24.23 172.206.36.76 TCP
57468 > https [FIN, ACK] Seq=22302 Ack=106248 Win=64128 Len=0
2257 11:01:12.133 172.206.36.76 203.243.24.23 TCP
https > 57468 [RST, ACK] Seq=106248 Ack=22302 Win=26681 Len=0
2258 11:01:12.133 172.206.36.76 203.243.24.23 TCP
https > 57468 [RST, ACK] Seq=106248 Ack=22302 Win=26681 Len=0
Case1 flow: Immediate return by curl_easy_perform
Req 3513 11:01:52.923 203.243.24.23 172.206.36.76
TLSv1 Application Data
3514 11:01:52.923 203.243.24.23 172.206.36.76
TLSv1 [TCP Out-Of-Order] Application Data
Resp 3515 11:01:52.929 172.206.36.76 203.243.24.23
TLSv1 Application Data
3516 11:01:52.929 172.206.36.76 203.243.24.23 TCP
https > 57482 [FIN, ACK] Seq=106247 Ack=22273 Win=26652 Len=0
3517 11:01:52.929 172.206.36.76 203.243.24.23
TLSv1 [TCP Out-Of-Order] Application Data
3518 11:01:52.929 172.206.36.76 203.243.24.23 TCP
https > 57482 [FIN, ACK] Seq=106247 Ack=22273 Win=26652 Len=0
3519 11:01:52.929 203.243.24.23 172.206.36.76 TCP
57482 > https [ACK] Seq=22273 Ack=106247 Win=64128 Len=0
3520 11:01:52.929 203.243.24.23 172.206.36.76
TLSv1 Encrypted Alert
3521 11:01:52.929 203.243.24.23 172.206.36.76 TCP
57482 > https [ACK] Seq=22273 Ack=106247 Win=64128 Len=0
3522 11:01:52.930 203.243.24.23 172.206.36.76
TLSv1 [TCP Out-Of-Order] Encrypted Alert
3523 11:01:52.931 203.243.24.23 172.206.36.76 TCP
57482 > https [FIN, ACK] Seq=22302 Ack=106248 Win=64128 Len=0
3524 11:01:52.931 203.243.24.23 172.206.36.76 TCP
57482 > https [FIN, ACK] Seq=22302 Ack=106248 Win=64128 Len=0
3525 11:01:52.934 172.206.36.76 203.243.24.23 TCP
https > 57482 [RST, ACK] Seq=106248 Ack=22302 Win=26681 Len=0
3526 11:01:52.934 172.206.36.76 203.243.24.23 TCP
https > 57482 [RST, ACK] Seq=106248 Ack=22302 Win=26681 Len=0
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