server {
    listen 80;
    listen [::]:80;
    server_name files.example.com;

    location /.well-known/acme-challenge/ {
        root /var/www/certbot;
    }

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

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name files.example.com;

    ssl_certificate /etc/letsencrypt/live/files.example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/files.example.com/privkey.pem;

    # Signed URLs contain credentials and signatures. Do not write the query
    # string to the standard access log.
    access_log off;

    location / {
        limit_except GET HEAD {
            deny all;
        }

        proxy_http_version 1.1;
        proxy_set_header Host $http_host;
        proxy_set_header X-Forwarded-Proto https;
        proxy_set_header Connection "";
        proxy_request_buffering off;
        proxy_buffering off;
        proxy_max_temp_file_size 0;
        proxy_read_timeout 300s;
        proxy_send_timeout 300s;
        proxy_pass http://127.0.0.1:3900;
    }

    add_header X-Content-Type-Options nosniff always;
}