超过70秒的请求是通过分析IIS日志发现的：
10.159.63.104是SLB的内网IP。
通过Wireshark抓包分析请求是9:22:21收到的(tcp.stream eq 23080)：
09:22:21.299838000 10.159.63.104 10.161.241.208 HTTP 291 GET /eastsea/p/3764040.html HTTP/1.0
这个请求响应内容的长度是：Content-Length 1154110（1.1MB）
云服务器（ECS）在收到请求后，发了一个ACK包：
09:22:21.354730000 10.161.241.208 10.159.63.104 TCP 66 http > 60895 [ACK] Seq=1 Ack=226 Win=66560 Len=0 TSval=16270579 TSecr=1049527471
接下来就是一堆的TCP segment of a reassembled PDU：
10.161.241.208 10.159.63.104 TCP 1514 [TCP segment of a reassembled PDU]
中间会出现一些错误：
1. TCP Dup ACK
10.159.63.104 10.161.241.208 TCP 78 [TCP Dup ACK 619713#1] 60895 > http [ACK] Seq=226 Ack=57921 Win=61440 Len=0 TSval=1049527542 TSecr=16270581 SLE=63713 SRE=75297
2. TCP Out-Of-Order
10.161.241.208 10.159.63.104 TCP 1514 [TCP Out-Of-Order] [TCP segment of a reassembled PDU]
3. TCP Fast Retransmission
10.161.241.208 10.159.63.104 TCP 1514 [TCP Fast Retransmission] [TCP segment of a reassembled PDU]
另外，中间也出现了大量的TCP Window Update：
10.159.63.104 10.161.241.208 TCP 66 [TCP Window Update] 60895 > http [ACK] Seq=226 Ack=175209 Win=16384 Len=0 TSval=1049528183 TSecr=16270632
最后在9:23:32才完成了响应内容的发送：
09:23:32.865387000 10.161.241.208 10.159.63.104 HTTP 486 HTTP/1.1 200 OK (text/html)
Wireshark中记录的中整个发送耗时：
Time since request: 71.565549000 seconds