HTTP_proxy
HTTP_proxy_user
HTTP_proxy_pass

##</code><code>##

Client-Warning: Unsupported authentication scheme 'ntlm'"

##</code><code>##

ppm> install XML-SAX-Simple
Error: Failed to download URL http://crazyinsomniac.perlmonk.org/perl/ppm/5.8/XML-SAX-Simple.ppd: 407 Proxy Authentication Required
ppm>