Issues Logging Into An HTTPS Site From Perl Script Using LWP::UserAgent

I'd like to write a Perl script that will go to an https website, login with a username and password and then upload a file. So the first thing I'm trying to do is actually log into the site using LWP::UserAgent. I created the code below to accomplish this, but it doesn't actually login to the site. I can see that I get a "200 OK" response from "$response->status_line", and it appears that I am on the login page of the site (based on what I'm seeing from "$response->as_string"), but it never actually logs in. So it looks to me like I'm on the login page, but I'm not sure how to actually login. I've read the LWP::UserAgent manpage many times over (and also other links from that manpage), but it's just not sinking in to this thick skull of mine. I searched through related threads here as well, but wasn't finding any that pertained to this issue I am having. Anyone mind sharing suggestions on what I'm doing wrong here? I've posted my code below. Thank you.

#!/usr/bin/perl

use strict;
use warnings;
use LWP::UserAgent;
use Data:umper;

my $https_login = '
my $https_user = 'username';
my $https_pass = 'password';

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

$ua->protocols_allowed( [ 'https'] );

# login to https site
my $response = $ua->post($https_login, [ 'user' =>
"$https_user",'password' => "$https_pass" ] );

if ($response->is_error()) {
printf " %s\n", $response->status_line;
print "https request error!\n";
} else {
printf " %s\n", $response->status_line;
print Dumper ($response->as_string);
}