You should initialize your proxy setting before you start
sending requests:
use LWP::UserAgent;
$ua = LWP::UserAgent->new;
$ua->env_proxy; # initialize from environment variables
# or
$ua->proxy(ftp => \'http://proxy.myorg.com\');
$ua->proxy(wais => \'http://proxy.myorg.com\');
$ua->no_proxy(qw(no se fi));