Can use

If the webserver that hosts your XML file supports ETag, then you can speed up things by using that caching mechanism. This is most noticeable with large XML files (such as eduGAIN metadata). I was a fairly trivial patch:

— check_http_xpath.pl 2018-11-23 16:07:33.521799526 +0100
+++ test.pl 2018-11-24 00:27:34.848817509 +0100
@@ -27,6 +27,7 @@
use Getopt::Std;
use XML::XPath;
use Data::Dumper;
+use HTTP::Cache::Transparent;

my %optarg;
my $getopt_result;
@@ -294,6 +295,10 @@
$lwp_user_agent->default_header(‘Host’ => “$host:$port”);
}

+HTTP::Cache::Transparent::init( {
+ BasePath => ‘/tmp/cache’,
+ } );
+
$url = “$http://${host_ip}:${port}$uri”;
$http_request = HTTP::Request->new(GET => $url);