sites-available slash default

upstream app {
    # Path to Unicorn SOCK file, as defined previously
    server unix:/home/ubuntu/listpump/shared/sockets/unicorn.sock fail_timeout=0;
}
server {
    listen 0.0.0.0;
    server_name localhost;
    root /home/ubuntu/listpump/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 /500.html;
    client_max_body_size 4G;
    keepalive_timeout 10;
}