idp on port 80 only ?

[Tom Zeller]

>> Of course you *can* configure your web server to implement TLS over
>> port 80, or any other port.  It doesn't help with your problem
>> because what people tend to charge for is not https per se, but the
>> individual IP address you need for it.
>
> So SNI to the rescue?
> Again, doable in constrained deployments, not ready for large-scale yet.

Ah, thanks for helping me understand.

Looks like Google App Engine supports SNI or VIP (dedicated IP) at a
monthly cost, which is probably okay for institutions but kinda high
for me.

https://developers.google.com/appengine/docs/ssl