I'm debugging a situation where we see duplicate HTTPS requests from iOS 5 & 6 devices with nginx 1.4.1. The first request seems to be cancelled by the client, but the package gets lost and now the new, repeated and the original request are both executed. This way the article ends up in the shopping cart twice.
Only one request is actually seen by iOS Safari / jQuery. This issue is reproducible most of the time (lets say 75 % of the cases) on two completely different servers with different hosting providers (Hetzner & Host Europe in Germany) but not with different browsers. It always follows the exact same pattern.
I'm pretty sure this can't be coincidental anymore, but have now idea what could cause this. It would be great if anybody could have a look at my capture:
No. Time Source Destination Protocol Length Info
493 27.329737 82.150.163.73 136.27.51.219 TCP 66 62463 > https [ACK] Seq=2166 Ack=9002 Win=130608 Len=0 TSval=649648630 TSecr=3316961520
497 28.789294 82.150.163.73 136.27.51.219 HTTP 871 GET /checkout/addArticle?callback=jQuery172056467744265683_1375187557137&sActionIdentifier=&sAddAccessories=&sAdd=4006040201915&sQuantity=1&_=1375187559605 HTTP/1.1
498 28.789391 136.27.51.219 82.150.163.73 TCP 66 https > 54311 [ACK] Seq=24569 Ack=5226 Win=18944 Len=0 TSval=3316961907 TSecr=649650051
499 28.789401 82.150.163.73 136.27.51.219 TLSv1 103 Alert (Level: Warning, Description: Close Notify)
500 28.789409 136.27.51.219 82.150.163.73 TCP 66 https > 54311 [ACK] Seq=24569 Ack=5263 Win=18944 Len=0 TSval=3316961907 TSecr=649650052
501 28.789413 82.150.163.73 136.27.51.219 TCP 66 54311 > https [FIN, ACK] Seq=5263 Ack=24569 Win=131072 Len=0 TSval=649650052 TSecr=3316961416
502 28.789975 136.27.51.219 82.150.163.73 TCP 66 https > 54311 [FIN, ACK] Seq=24569 Ack=5264 Win=18944 Len=0 TSval=3316961907 TSecr=649650052
503 28.789993 82.150.163.73 136.27.51.219 HTTP 871 GET /checkout/addArticle?callback=jQuery172056467744265683_1375187557137&sActionIdentifier=&sAddAccessories=&sAdd=4006040201915&sQuantity=1&_=1375187559605 HTTP/1.1
504 28.790144 136.27.51.219 82.150.163.73 TCP 66 https > 62463 [ACK] Seq=9002 Ack=2971 Win=13056 Len=0 TSval=3316961907 TSecr=649650053
505 28.839637 82.150.163.73 136.27.51.219 TCP 66 [TCP Retransmission] 54311 > https [FIN, ACK] Seq=5263 Ack=24569 Win=131072 Len=0 TSval=649650117 TSecr=3316961907
506 28.839661 136.27.51.219 82.150.163.73 TCP 78 [TCP Dup ACK 502#1] https > 54311 [ACK] Seq=24570 Ack=5264 Win=18944 Len=0 TSval=3316961919 TSecr=649650117 SLE=5263 SRE=5264
507 28.839665 82.150.163.73 136.27.51.219 TCP 66 [TCP Retransmission] 54311 > https [FIN, ACK] Seq=5263 Ack=24569 Win=131072 Len=0 TSval=649650117 TSecr=3316961907
508 28.839710 136.27.51.219 82.150.163.73 TCP 78 [TCP Dup ACK 502#2] https > 54311 [ACK] Seq=24570 Ack=5264 Win=18944 Len=0 TSval=3316961919 TSecr=649650117 SLE=5263 SRE=5264
509 28.840856 82.150.163.73 136.27.51.219 TCP 66 54311 > https [ACK] Seq=5264 Ack=24570 Win=131072 Len=0 TSval=649650117 TSecr=3316961907
510 29.945273 136.27.51.219 82.150.163.73 TCP 1506 [TCP segment of a reassembled PDU]
511 29.945307 136.27.51.219 82.150.163.73 HTTP 695 HTTP/1.1 200 OK (text/_javascript_)
