Extra tidbits:

• If something isn't working as expected, one should start by checking what error occured! open, print and close all indicate if they were successful, and if not, why they weren't.

• Declaring variables before they are used just introduces the possibility of errors. Instead of

  my $x;
  ...
  $x = ...;
  [download]

  do

  ...
  my $x = ...;
  [download]

• Speaking of declaring variables, don't use global variables for file handles. That hasn't been necessary for 10 years.

  open(my $fh, '>', '/tmp/data.txt')
      or die("Can't create file /tmp/data.txt: $!\n");
  print $fh $res->content;
  close($fh);
  [download]

• my $req = HTTP::Request->new(GET =>'http://SOMEURLHERE');
  my $res = $ua->request($req);
  [download]

  can be written as

  my $res = $ua->get('http://SOMEURLHERE');
  [download]

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