Nginx conf for Rails app

nginx_rails.conf

upstream project {
  server 127.0.0.1:4000;
  server unix://project/tmp/puma/puma.sock;
}

server {
  listen 80;
  server_name _;
  access_log /var/log/nginx/project.access.log;
  error_log /var/log/nginx/project.error.log;
  root /project/public;
  error_page 404 /404.html;
  error_page 422 /422.html;
  error_page 500 501 502 503 504 /500.html;

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

  location / {
    proxy_set_header Host $http_host;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_redirect off;

    if (-f $request_filename/index.html) {
      rewrite (.*) $1/index.html;
    }
    if (-f $request_filename.html) {
      rewrite (.*) $1.html;
    }
    if (!-f $request_filename) {
      proxy_pass http://project;
      break;
    }
  }
}