Each connection type can be abbreviated by the first character as
If ProtoList and dstHostList are given, this control is applied only
to the protocols and hosts included in the lists. For example,
to use cached data in a host which is not connected to external networks,
specify as CONNECT="cache:*:!./@".
In current implementation, "cache" will be tried first anyway if it is
included in the connSeq.
A combination of -Pport with CONNECT=udp relays from TCP client
to UDP server,
and -Pport/udp with non-udp CONNECT relays from UDP client
to TCP server.