Lighttpd

The lets-encrypt client shell (acme.sh) supports something called (stateless-mode)

See: https://github.com/Neilpang/acme.sh/wiki/Stateless-Mode

They give a usage example with "nginx" server

root@ed:~# acme.sh --register-account
[Mon Feb 6 21:40:18 CST 2017] Registering account
[Mon Feb 6 21:40:19 CST 2017] Already registered
[Mon Feb 6 21:40:21 CST 2017] Update success.
[Mon Feb 6 21:40:21 CST 2017] ACCOUNT_THUMBPRINT='6fXAG9VyG0IahirPEU2ZerUtItW2DHzDzD9wZaEKpqd'

Configure the nginx server to return the account key thumbprint:

http {
...
server {
...
location ~ "^/\.well-known/acme-challenge/([-_a-zA-Z0-9]+)$" {
default_type text/plain;
return 200 "$1.6fXAG9VyG0IahirPEU2ZerUtItW2DHzDzD9wZaEKpqd";
}
...
}
}

Is their a way to accomplish this with lighttdp, thanks for the great software and any help