Nginx conf for reverse proxying a rails app

nginx-rails.conf

upstream app {
    # Path to Puma SOCK file, as defined previously
    # server unix:/home/deploy/appname/shared/sockets/puma.sock fail_timeout=0;
    server unix:/Users/ericwalker/src/github.com/ewalk153/sample-rails-app/shared/sockets/puma.sock fail_timeout=0;
}

server {
    listen 4000;
    server_name localhost;

    root /Users/ericwalker/src/github.com/ewalk153/sample-rails-app/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;
}