keepalive_timeout, proxy_send_timeout, and proxy_read_timeout ignored

[dgobaud]

Hi, I'm using AWS Beanstalk with nginx in front of a Puma server serving
Ruby on Rails. I have one URL that is for an EventSource so it is kept alive
and data is streamed out. I was running into this problem
http://forum.nginx.org/read.php?2,237386,237386 where when the client closes
the browser but nginx keeps the connection alive forever so I tried having
nginx automatically close the connection after 5 seconds. I set
keepalive_timeout, proxy_send_timeout, and proxy_read_timeout all to 5
seconds but all were ignored. The connection remained open until nginx was
restarted.

# nginx config

upstream my_app {
  server unix:///var/run/puma/my_app.sock;
}
 
server {
  listen 80;
  server_name _ localhost; # need to listen to localhost for worker tier
 
  if ($http_x_forwarded_proto = "http") { return 301
https://$host$request_uri; }

  location /dashboard_stream {
    proxy_pass http://my_app; # match the name of upstream directive which
is defined above
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_buffering off;
    proxy_cache off;
    proxy_http_version 1.1;
    proxy_set_header Connection '';
    chunked_transfer_encoding off;
    keepalive_timeout 5s;
    proxy_send_timeout 5s;
    proxy_read_timeout 5s;
  }
}

# nginx version
nginx version: nginx/1.6.2

# AWS linux version
NAME="Amazon Linux AMI"
VERSION="2015.03"
ID="amzn"
ID_LIKE="rhel fedora"
VERSION_ID="2015.03"
PRETTY_NAME="Amazon Linux AMI 2015.03"
ANSI_COLOR="0;33"
CPE_NAME="cpe:/o:amazon:linux:2015.03:ga"
HOME_URL="http://aws.amazon.com/amazon-linux-ami/"
Amazon Linux AMI release 2015.03

# kernel version
Linux ip-172-31-12-138 3.14.42-31.38.amzn1.x86_64 #1 SMP Wed May 13 20:33:05
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,260257,260257#msg-260257