Another reserved name is "mypro.xyz". An access to "http://mypro.xyz"
is interpreted to your proxy server like "http://-.-".
If the proxy is chained, you can access to upstream proxies by
prefixing the hop count N from your client, as "http://N.mypro.xyz",
as "http://2.mypro.xyz" for example.
This feature can be enabled or disabled by the
HTTPCONF=mypro.xyz parameter.