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The variable parentProxy specifies the hostname and port number
of an HTTP parent proxy; it should have the form `host:port'.
   
If the parent proxy requires authorisation, the username and password
should be specified in the variable parentAuthCredentials in
the form `username:password'.  Only Basic authentication
is supported, which is vulnerable to replay attacks.
   
The main application of the parent proxy support is to cross
firewalls.  Given a machine, say trurl, with unrestricted
access to the web, the following evades a firewall by using an
encrypted compressed ssh link:
     $ ssh -f -C -L 8124:localhost:8123 trurl polipo
     $ polipo parentProxy=localhost:8124