It also advances where the $mech object points to. $mech->content should be ok after the submit. I do agree, however, with your sentiment that checking the return value of ->submit_form is a good idea. The documentation mentions other things to check as well like ->success and ->status.

I tried condensing the code a little bit to make it easier to figure out what goes wrong. The CONTENT is still empty but the URL shows that it did infact redirect to the proper page!

In theory I could just get that URL, but it'd be a new instance of it when I need to know what the exact source code was once the form was submitted (to check for login errors).

Any other suggestions?

   use WWW::Mechanize;
    my $mech = WWW::Mechanize->new();
    $mech->cookie_jar(HTTP::Cookies->new);

    $mech->get( $forum_login );

if ($forum_type eq "number")
{
    $mech->submit_form(
        form_number => $forum_call,
        fields      => {
            $forum_user     => $username,
            $forum_pass    => $password,
        }
    );
  die "Couldn't submit form" unless $mech->success;

my $stuff = $mech->content;
print $stuff;

my $url = $mech->uri;
print $url;
}
[download]

You can selectively disable the redirection. I suppose that if you need to examine something on the pre-redirect page that you'd use that feature.

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But just out of curiousity, I tried your suggestion but it, too, comes back completely empty.