我的客户不断向nginx服务器发送http请求，试图通过request.Session建立的保持链接。但是nginx的error.log显示我的客户端不断关闭链接。
这里是发件人。实际上，我的客户端是一台应用服务器，不断向Nginx发送性能统计信息。
# Init the keep-alived connection when booting the application server
def global_init():
.......
global s_perf
s_perf = requests.Session()
#Send performance statistic
def perf(message):
s_perf.post('http://127.0.0.1:8180/perf', data=message)
Nginx正确接收了这些统计信息。但是logs / error.log显示该链接经常关闭：
2019/11/18 17:01:43 [info] 61987#61987: *11945220 client 10.32.170.17 closed keepalive connection
2019/11/18 17:01:43 [info] 61992#61992: *11943901 client 10.32.170.17 closed keepalive connection
2019/11/18 17:01:43 [info] 61964#61964: *11945149 client 10.32.170.17 closed keepalive connection
2019/11/18 17:01:43 [info] 61955#61955: *11945286 client 10.32.170.17 closed keepalive connection
2019/11/18 17:01:43 [info] 61973#61973: *11944762 client 10.32.170.17 closed keepalive connection
2019/11/18 17:01:43 [info] 61985#61985: *11945354 client 10.32.170.17 closed keepalive connection