In the Unix world with PHP, you can do OS fingerprinting by calling a system tool such as nmap (option: -O), but this require root privileges, and is not always perceived as well-behaviour by sysadmins. Or you can do everything you want with PHP sockets.
I guess Netcraft use OS fingerprinting tool like nmap above their 'HEAD /' http requests.
And ok, I wont post Perl things anymore ;-)
Christophe
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