This git repository is a "mirror" of the code pointed to by: https://v6tools.kasperd.dk/ssh-host-header/
The original Python 2 version is here: https://v6tools.kasperd.dk/ssh-host-header/ssh-sni-proxy-command.py
The Python 3 version in this repository can also be found here: https://v6tools.kasperd.dk/ssh-host-header/ssh-sni-proxy-command-python-3.py
This version is for Python3.
Thanks and all credit go to Kasper Dupont for this work.