I am completely new to Perl and trying to get my head around a few things

On the client side to create a header I this seems to work

use LWP;
my $url = shift;
my $headName = "NewHeader";
my $headValue = "NewValue";
my $request = HTTP::Request->new(HEAD, $url,[$headName,[$headValue]]);
[download]

How would I create the new header on the server-side?

Cheers