Nginx configuration for Rails API only

nginx.conf

worker_processes 1;

events {
  worker_connections 1024;
}

http {
  upstream app {
     server unix:/var/www/hajsapp/shared/sockets/puma.sock;
  }

  server {
     listen 80;
     server_name api.hajsapp.pl;

     root /var/www/hajsapp/current/public;

     try_files $uri/index.html $uri @app;

     location @app {
       proxy_pass http://app;
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
       proxy_set_header Host $http_host;
       proxy_redirect off;
     }

     error_page 500 502 503 504 /error.json;
     client_max_body_size 4G;
     keepalive_timeout 10;
  }
}