nginx.conf for Heroku

nginx.conf.erb

daemon off; # For Docker
worker_processes <%= ENV['NGINX_WORKERS'] || 4 %>; # For Heroku

load_module modules/ngx_http_geoip_module.so; # GeoIP

events {
  worker_connections 1024;
  multi_accept on;
  use epoll;
}

http {
  charset utf-8;
  sendfile on;
  tcp_nopush on;
  server_tokens off;

  keepalive_timeout 65s;

  gzip on;
  gzip_min_length 100;
  gzip_comp_level 3;
  gzip_types text/css;
  gzip_types text/javascript;
  gzip_disable "msie6";

  include mime.types;
  default_type application/octet-stream;

  open_file_cache max=1000 inactive=20s;
  open_file_cache_valid 30s;
  open_file_cache_min_uses 2;
  open_file_cache_errors on;

  client_body_buffer_size 16k;
  client_header_buffer_size 1k;
  client_max_body_size 8m;
  large_client_header_buffers 2 1k;
  client_body_timeout 5; # For Heroku

  # GeoIP
  geoip_country /etc/nginx/geoip/GeoIP.dat;
  geoip_city /etc/nginx/geoip/GeoLiteCity.dat;

  # Logs
  log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for" '
                    '"$request_body"';
  access_log logs/access.log main;
  error_log logs/error.log warn;

  upstream heroku_app {
    server <%= ENV["HEROKU_APP_DOMAIN"] %>;
  }

  server{
    listen <%= ENV["PORT"] %>;
    server_name _;

    # Common headers
    add_header X-Frame-Options SAMEORIGIN;

    location ^~ / {
      proxy_pass http://heroku_app;

      proxy_redirect   off;
      proxy_set_header Host               <%= ENV["HEROKU_APP_HOST"] %>;
      proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;
      proxy_set_header X-Real-IP          $remote_addr;
      proxy_set_header X-Forwarded-Host   $http_host;
      proxy_set_header X-Forwarded-Server $http_host;
      proxy_set_header Connection         '';
      proxy_http_version 1.1;
    }

    location ~* \.(css|js|jpg|png|gif)$ {
      access_log off;
      expires 1M;
      add_header Pragma public;
      add_header Cache-Control public;
      add_header Vary Accept-Encoding;
    }

    error_page 500 502 503 504 /50x.html;
    location = /50x.html {
      root /sites/public;
    }
  }

}