Example of nginx configuration for proxing to a rails application. Don't forget to change <template_strings>

nginx--rails-application.conf

server {
  listen <ip>:<port>;
  server_name <domain>;
  charset off;
  set $root_path <path_to_rails_application>/public;
  disable_symlinks if_not_owner from=$root_path;
  root $root_path;
  access_log <path_to_logs_dir>/<domain>-access.log;
  error_log <path_to_logs_dir>/<domain>-error.log notice;

  # Assets
  location ~* ^.+\.(jpg|jpeg|gif|png|svg|svg.gz|js|css|mp3|mp4|ogg|mpe?g|avi|zip|gz|bz2?|rar|swf|txt|ico|eot|eot.gz|ttf|ttf.gz|woff|woff2|pdf|csv|xls|xlsx|doc|docx)$ {
    try_files $uri $uri/ @backend;
    expires 7d;
    access_log	off;
    log_not_found off;
    gzip_static on;
  }

  location / {
    proxy_pass http://127.0.0.1:<rails_application_port>;
    proxy_set_header Host $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;
  }

  # ActionCable
  location /cable {
    proxy_pass http://127.0.0.1:<rails_application_port>;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
  }

  location @backend {
    proxy_pass http://127.0.0.1:<rails_application_port>;
    proxy_set_header Host $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;
  }
}