perl module prereqs:

1. AnyEvent
2. JSON
3. twiggy
4. Protocol::WebSocket
5. Text::MicroTemplate::File

Debian packages: twiggy, libanyevent-perl, libjson-perl, libtext-microtemplate-perl Debian install from cpan: Protocol::WebSocket

Many of these prereqs are in Fedora's and Debian's package system

To install:

1. create the user/group ntpwww (or adjust the user in ntp-app)
2. Put ntp-www.service in /etc/systemd/system/ (adjust ExecStart= + WorkingDirectory= as needed)
3. systemctl enable ntp-www ; systemctl start ntp-www

This will listen on port 9090 and respond as a HTTP server