Perhaps the following code snippet will help you get going in the right direction. It needs a lot of error-checking (it's not intended to be a robust solution, just a starting point).

#!/usr/bin/perl
use strict;
use warnings;

use LWP::UserAgent;
use HTTP::Request;

$/  = undef; #slurp;
my $content = <STDIN>;

my $uri = shift; # arg

my $method = 'POST';

my $request = HTTP::Request->new($method, $uri, undef, $content);

my $ua = LWP::UserAgent->new(timeout => 10);

my $response = $ua->request($request);

if ($response->is_success)
{
    print $response->content;
}
else
{
    print $response->error_as_HTML;
}
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