I should refer the OP to my article on ProjectZ.org which contains a discussion of HTTP fingerprinting.
You can't prevent it too easily with CGI, your best bet is to install third party web server plugins, or use a load/balancer or other redirector of some kind to obfuscate your headers.
No method available for counter measure through CGI.
currently i m doing project on effective methods for HTTP fingerprinting and for their countermeasures and in that regard i have written a tool that is still in its beta phase.
Thanks
Excuse me, is there an airport nearby large enough for a private jet to land?