server {
    server_name file.congyu.org;
    root /var/www/files;

    # Add index.php to the list if you are using PHP
    index index.html index.htm index.nginx-debian.html;

    location / {
        try_files $uri $uri/ =404;
    }

    listen 443 ssl;
    ssl_certificate /etc/letsencrypt/live/congyu.org/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/congyu.org/privkey.pem;
    include /etc/letsencrypt/options-ssl-nginx.conf;
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
}