back

# cat nginx1.conf 
user www-data;

events {
}

http {

  server {
      listen 0.0.0.0:8080;
      error_log /dev/stdout debug;
      access_log /dev/stdout;

      location / {
         root /etc/nginx;
      }
  }
}

back _log

2019/01/30 13:46:46 [info] 410#410: *3 writev() failed (32: Broken pipe) while sending response to client, client: 127.0.0.1, server: , request: "GET /bigfile HTTP/1.0", host: "my"
127.0.0.1 - - [30/Jan/2019:13:46:46 +0000] "GET /bigfile HTTP/1.0" 200 323977163 "-" "curl/7.58.0"

lb

user www-data;

events {
}

http {

  upstream my {
    server 127.0.0.1:8080  fail_timeout=10s;
  }

  server {
      listen 0.0.0.0:80;
      error_log /dev/stdout debug;
      access_log /dev/stdout;

  location / {
    proxy_pass            http://my;
  }

  }
}

lb_log

2019/01/30 13:46:46 [warn] 407#407: *11 an upstream response is buffered to a temporary file /var/cache/nginx/proxy_temp/4/00/0000000004 while reading upstream, client: 172.17.0.1, server: , request: "GET /bigfile HTTP/1.1", upstream: "http://127.0.0.1:8080/bigfile", host: "0.0.0.0:8080"
2019/01/30 13:46:46 [info] 407#407: *11 epoll_wait() reported that client prematurely closed connection, so upstream connection is closed too while reading upstream, client: 172.17.0.1, server: , request: "GET /bigfile HTTP/1.1", upstream: "http://127.0.0.1:8080/bigfile", host: "0.0.0.0:8080"
172.17.0.1 - - [30/Jan/2019:13:46:46 +0000] "GET /bigfile HTTP/1.1" 200 149562 "-" "curl/7.58.0"