nginx config for puma

puma.conf

upstream puma_upstream { # rename this to be unique
  server unix://path/to/sock;
}
server {
  listen 80;

  client_max_body_size 4G;
  keepalive_timeout 10;

  server_name example.com;
  root /path/to/app/public;
  try_files $uri @puma;

  location @puma{
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $server_name;
    proxy_redirect off; 
    proxy_pass http://puma_upstream; # use same upstream name as above
    access_log /path/to/app/shared/log/nginx.access.log
    error_log /path/to/app/shared/log/nginx.error.log;
  }

  location /assets/ {
    gzip_static on;
    expires max; 
    add_header Cache-Control public;
  }
}