I don't believe it is possible to authenticate to a proxy with just LWP::UserAgent. However in the WWW:Mechanize docs it says

If it's possible with LWP::UserAgent, then yes. WWW::Mechanize is a subclass of LWP::UserAgent, so all the wondrous magic of that class is inherited. .

So you should be able to use the same method(using HTTP::Request) to authenticate.

Update:May also want to try using the LWP::Authen modules.

In reply to Re: WWW::Mechanize and proxy with username/password by tcf22
in thread WWW::Mechanize and proxy with username/password by perlhack

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