LWP should handle both Basic and Digest authentication with LWP::Authen::Basic and LWP::Authen::Digest.

I've searched for more documentation about LWP and Digest authentication, but not found much more.

I've found the node LWP and Digest Authentication here on PerlMonks which linked me to the t/jigsaw-auth-d.t script inside the libwww-perl distribution. which is kind of confusing.

use LWP::UserAgent;

{
   package MyUA;
   use vars qw(@ISA);
   @ISA = qw(LWP::UserAgent);

   my @try = (['foo', 'bar'], ['', ''], ['guest', ''], ['guest', 'gues
+t']);

   sub get_basic_credentials {
    my($self,$realm, $uri, $proxy) = @_;
    print "$realm:$uri:$proxy => ";
    my $p = shift @try;
    print join("/", @$p), "\n";
    return @$p;
   }

}

my $ua = MyUA->new(keep_alive => 1);

my $req = HTTP::Request->new(GET => "http://jigsaw.w3.org/HTTP/Digest/
+");
my $res = $ua->request($req);
[download]

To properly use the digest authentication the function get_basic_credentials() have to be overridden as ikegami did on Re^3: LWP and Digest Authentication.