Nginx configuration for Rails app with Puma unix socket

rails-app-nginx.conf

# This file is prior to installing Certbot.
# Don't use HTTP Basic Auth without SSL!

# Redirect www requests to non-www host
server {
    server_name www.myserver.com www.mysvr.com;
    return 301 $scheme://myserver.com$request_uri;
}

# Upstream server (Puma socket)
upstream puma {
  server unix:/srv/app/shared/tmp/sockets/puma.sock fail_timeout=0;
  # server 127.0.0.1:9292;
}

server {
  auth_basic           "Administrator’s Area";
  auth_basic_user_file htpasswd;

  root /srv/app/current/public;

  # direct to maintenance if this file exists
  if (-f $document_root/system/maintenance.html) {
    rewrite  ^(.*)$  /system/maintenance.html last;
    break;
  }
  
  # assets caching
  location ~ ^/(assets|packs/js)/ {
    access_log  off;
    gzip_static on;
    expires     max;
    add_header  Cache-Control public;
    add_header  Last-Modified "";
    add_header  ETag "";

    #open_file_cache          max=1000 inactive=500s;
    #open_file_cache_valid    600s;
    #open_file_cache_errors   on;
    break;
  }

  try_files $uri @puma;

  location @puma {
    proxy_redirect    off;
    proxy_set_header  Host $host;
    proxy_set_header  X-Real-IP $remote_addr;
    proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_pass        http://puma;
    #proxy_http_version 1.1;
  }

  error_page 500 502 503 504 /500.html;
  keepalive_timeout 10;

  location = /favicon.ico {
    expires    max;
    add_header Cache-Control public;
  }

  server_name myserver.com mysvr.com; # http2;
}