upstream web_rack {
    server 1.1.1.1:80;
    server 2.2.2.2:80;
}
server {
        listen 80;
        listen [::]:80;
        server_name domain.com;
    client_max_body_size 1G;
    # the server will close connections after this time
    keepalive_timeout 5;
        location / {
    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_set_header X-Forwarded-Proto https;
            proxy_pass http://web_rack;
        }
}

upstream domain.com {
    server unix:/tmp/unicorn.theapp.socket
        fail_timeout=0;
}
server {
listen 80;
server_name domain.com;

    # replace this with your static Sinatra app files, root + public
    root /home/app/mainapp/current/public;
    # port to listen for requests on
   error_log /var/log/nginx-error.log;
# maximum accepted body size of client request
    client_max_body_size 1G;
    # the server will close connections after this time
    keepalive_timeout 5;
    location ~ ^(js|images|css|fonts|views|assets)$ {
  root /home/app/mainapp/current/public;
  expires max;
  add_header Cache-Control public;
  log_not_found off;
}
    location / {
      try_files $uri @app;
    }

    location @app {
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header Host $http_host;
      proxy_redirect off;
      # pass to the upstream unicorn server mentioned above
      proxy_pass http://domain.com;
    }

}