nginx_puma_myapp.conf

upstream myapp {
  server unix:///home/rails/myapp/tmp/sockets/puma.socket;
}

server {
  listen 80 default_server;
  server_name myapp; # change to match your URL
  server_tokens off;
  root /home/rails/myapp/public; # I assume your app is located at this location

  access_log  /var/log/nginx/myapp_access.log;
  error_log   /var/log/nginx/myapp_error.log;

  location ~* ^/assets/ {
    gzip_static on;

    # Per RFC2616 - 1 year maximum expiry
    expires 1y;
    add_header Cache-Control public;

    # Some browsers still send conditional-GET requests if there's a
    # Last-Modified header or an ETag header even if they haven't
    # reached the expiry date sent in the Expires header.
    add_header Last-Modified "";
    add_header ETag "";
    break;
  }

  location / {
    gzip_static on;

    # serve static files from defined root folder;.
    # @gitlab is a named location for the upstream fallback, see below
    try_files $uri $uri/index.html $uri.html @myapp;
  }

  # if a file, which is not found in the root folder is requested,
  # then the proxy pass the request to the upsteam
  location @myapp {
    proxy_read_timeout 300; # https://github.com/gitlabhq/gitlabhq/issues/694
    proxy_connect_timeout 300; # https://github.com/gitlabhq/gitlabhq/issues/694
    proxy_redirect     off;

    proxy_set_header   X-Forwarded-Proto $scheme;
    proxy_set_header   Host              $http_host;
    proxy_set_header   X-Real-IP         $remote_addr;

    proxy_pass http://myapp;
  }
}