portupgrade over http only

[Michael]

Hello,

Is it possible to force portupgrade to use only http protocol where 
possible and skip the ftp servers?

It's because currently I'm using very restrictive public access point 
where they block everything other than port 80 and I don't have a chance 
to set up a tunnel or proxy anywhere outside that network.

When I try to:
portupgrade -arRF
it looks like it prefers ftp. Eventually it falls back to http but it 
takes ages before it tries all ftp servers. What to do?

Thanks