If what Corion suggested doesn't work, you could try this:
if ($opt_proxy) {
  my $h = "Proxy_Authorization";
  my $req = new HTTP::Request;
  $req->proxy_authorization_basic($user, $passwd);
  $WWW::Mechanize::headers{$h} = $req->header($h);
}
# Then the rest of your program

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

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