HTTPS does support virtual hosting. You can have certificates with wildcards, e.g. *.wikipedia.org, and you can even have certificates that list multiple second-level domains. In theory we could even support https://en.wikipedia.org/, by having LVS pass the traffic off to an SSL proxy cluster, which forwards to the Florida squids via a secure tunnel.
From what I've read HTTPS does not support name-based virtual hosting,
only IP based virtual hosting, as the SSL connection happens before the request is made. So, if you have two virtual hosts such as:
<Virtualhost en.wikipedia.org> ... </Virtualhost>
<Virtualhost de.wikipedia.org> ... </Virtualhost>
The first virtual host will always be used as the server has absolutely no clue, when the connection is made, which virtual host it needs to use.
I believe this is the point Neil was trying to make.
V/r,
Ryan Lane