超时请求，但Cloudflare请求200

Question

我们遇到Cloudflare的超时请求问题。请参阅以下示例：

1. OkHttp 3.6 + Retrofit 2.1 + Android + HTTPS + HTTP / 2
2. 创建一个OkHttp客户端
3. GET（或POST）请求（循环，与请求之间的1秒同步）

设备日志

GET test?id=0 200
GET test?id=1 200
GET test?id=2 200

nginx日志

GET test?id=0 200
GET test?id=1 200
GET test?id=2 200

1. 关闭网络（我们断开电缆，但设备仍然连接到路由器）
2. 等等。 30-60秒

设备日志

GET test?id=3 timeout
GET test?id=4 timeout
GET test?id=5 timeout
GET test?id=6 timeout
GET test?id=7 timeout
GET test?id=8 timeout
GET test?id=9 timeout
GET test?id=10 timeout

1. 恢复网络

第一种情况（使用cloudflare从我们的nginx登录）

[21/Feb/2017:13:45:49 +0000] "GET test?id=7 HTTP/2" 200 44
[21/Feb/2017:13:45:49 +0000] "GET test?id=16 HTTP/2" 200 44
[21/Feb/2017:13:45:49 +0000] "GET test?id=5 HTTP/2" 200 44
[21/Feb/2017:13:45:49 +0000] "GET test?id=4 HTTP/2" 200 44
[21/Feb/2017:13:45:49 +0000] "GET test?id=6 HTTP/2" 200 44
[21/Feb/2017:13:45:49 +0000] "GET test?id=8 HTTP/2" 200 44
[21/Feb/2017:13:45:49 +0000] "GET test?id=14 HTTP/2" 200 44
[21/Feb/2017:13:45:49 +0000] "GET test?id=10 HTTP/2" 200 44
[21/Feb/2017:13:45:49 +0000] "GET test?id=9 HTTP/2" 200 44

第二种情况（从没有cloudflare的nginx登录）

[21/Feb/2017:13:45:49 +0000] "GET test?id=3 HTTP/1.1" 499 0
[21/Feb/2017:13:45:49 +0000] "GET test?id=4 HTTP/1.1" 499 0
[21/Feb/2017:13:45:49 +0000] "GET test?id=5 HTTP/1.1" 499 0
[21/Feb/2017:13:45:49 +0000] "GET test?id=6 HTTP/1.1" 200 0
[21/Feb/2017:13:45:49 +0000] "GET test?id=7 HTTP/1.1" 499 0
[21/Feb/2017:13:45:49 +0000] "GET test?id=8 HTTP/1.1" 499 0
[21/Feb/2017:13:45:49 +0000] "GET test?id=9 HTTP/1.1" 499 0
[21/Feb/2017:13:45:49 +0000] "GET test?id=10 HTTP/1.1" 499 0
[21/Feb/2017:13:45:49 +0000] "GET test?id=11 HTTP/1.1" 499 0

3到11的请求在设备上超时，那么为什么我们在使用Cloudflare时会获得200个请求？如果我们直接向我们的服务器发出这些请求（没有Cloudflare），我们会按预期得到499。