http://www.perlmonks.org?node_id=460540


in reply to Re^3: Passing a cookie with LWP::UserAgent
in thread Passing a cookie with LWP::UserAgent

you basicly need something like this: $ua->cookie_jar(HTTP::Cookies->new(file => "cookies.txt",autosave => 1));

some code from some of my script (to ilustrate how it works):
$ua = LWP::UserAgent->new;
$ua->cookie_jar(HTTP::Cookies->new(file => "cookies.txt",autosave => 1));
my $req = HTTP::Request->new(POST => 'http://www.cacti.kobra.ktu.lt/index.php');
$req->content_type('application/x-www-form-urlencoded');
$req->content('login_username='.$login.'&login_password='.$passw.'&action=login');
my $res = $ua->request($req);
sleep(3);

my $req = HTTP::Request->new(GET => 'http://www.cacti.kobra.ktu.lt/tree.php?action=item_edit&parent_id=254&tree_
id=12&type_select=2');
my $res = $ua->request($req);
my $data = $res->as_string;
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