server {
    listen      80;
    listen [::]:80;
    server_name $BASE_URL;

    return 301 https://$host$request_uri;
}

server {
    listen      443 ssl;
    listen [::]:443 ssl;
    server_name $BASE_URL;

    ssl_certificate     /etc/letsencrypt/live/$BASE_URL/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/$BASE_URL/privkey.pem;

    location / {
        proxy_pass http://app;

        proxy_set_header Host              $host;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}