upstream rails-server {
    server 127.0.0.1:3000 fail_timeout=0;
}

server {
    listen 80 default_server;
    listen [::]:80 default_server;

    server_name _;

    root /app/public;

    client_max_body_size 16m;

    location / {
        try_files $uri $uri/index.html $uri.html @rails;
    }

    location ~ ^/assets/ {
        expires 1y;
        add_header Cache-Control public;

        add_header ETag "";
        break;
    }

    location @rails {
        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 $scheme;
        proxy_set_header Host $http_host;
        proxy_pass http://rails-server;
        proxy_redirect off;
        error_page 500 502 504 /500.html; # Rails error pages
    }
}