nginx/iacore.conf

server {
    listen 443 ssl;
    listen [::]:443 ssl;
    server_name www.1a-insec.net;

    ssl_certificate /etc/letsencrypt/live/www.1a-insec.net/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/www.1a-insec.net/privkey.pem;

    root /srv/http/pages/iacore;
    index index.html;
    error_page 404 404.html;

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

    location ~* .(eot|otf|woff|ttf|css|js|svg|jpg|jpeg|gif|png|ico|bmp|webp)$ {
        add_header Cache-Control stale-while-revalidate=604800;
    }
}