You might also be interested to know that Apache(2*) already does/provides this internally. Since I wrote, and use my own HTTPD, I don't use Apache as a rule. But I do keep a version on one of my servers for experimentation. Here's an example from the log:

apache.null - - [19/Nov/2013:07:13:45 -0800] "OPTIONS * HTTP/1.0" 200 
+- "-" "Apache/2.2.24 (...) (internal dummy connection)"
[download]

HTH, and Best wishes.

--Chris

#!/usr/bin/perl -Tw
use Perl::Always or die;
my $perl_version = (5.12.5);
print $perl_version;