Client code:
my $url = "https:\/\/acct:pass\@ftp.mydomain.com/cgi-bin/upload.pl";
my $ua = LWP::UserAgent->new;
$ua->agent("MyApp/0.1 ");
my $file="c:\\filetoupload.txt"; 
$res = $ua->post($url,
[ "ac" => 'upload',
"file" => "$file"
]
); 
print $res->content, "\n";

##</code><code>##

## open of the file on server
open(FILE,">$upload_dir/$file_name") || &Error("Error opening file $file_name for writing, error $!", 1);
binmode FILE;

$time=time();
while (1)
{
### fails here return code is undef.
$bytes_count = read($file_query,$buff,2096);
if ($bytes_count == 0)
{
last;
}