I believe your question relates to writting code that can get past a proxy rather than trying to use PPM through a proxy.
That being the case, take a look at the CPAN module, Net::HTTPTunnel.
I believe it will get you started and has references for more reading as a bonus

In reply to Re: Access the Internet though a Proxy with Perl by phydeauxarff
in thread Access the Internet though a Proxy with Perl by 2mths

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