By default, an access to the virtual domain name
"http://mypro.xyz"
is interpreted as an access to your proxy server.
HTTPCONF="mypro.xyz:forw" enables forwarding the request to
upstream proxies by prefixing the hop count.
HTTPCONF="mypro.xyz:thru" disables this interpretation and
forward the request to the upstream proxy if exists.
HTTPCONF="mypro.xyz:stop" stops this interpretation and forwarding at all.
Another way for restriction of access to mypro.xyz is using AUTHORIZER
as AUTHORIZER="-list{User:Pass}:*:*.mypro.xyz:*".