my $ua = LWP::UserAgent->new;

# Proxy location
$ua->proxy(['http', 'ftp'] => 'proxy-url');

# What we want - hardcoded
my $req = HTTP::Request->new('GET',"target-url");

# Authenticate against the proxy - hardcoded
$req->proxy_authorization_basic("domain/user", "password");

##</code><code>##

URL url = new URL("target");
String authString = "domain/user:password";  	
String auth = "Basic " + new sun.misc.BASE64Encoder().encode(authString.getBytes());
URLConnection conn = url.openConnection();
			conn.setRequestProperty("Proxy-Authorization", auth);