how to hide server side language on a CI site?

[eluser]stef25[/eluser]
Client wants to hide which server side technology we are using. index.php is being removed from the url, but he rightly suggested that if some one adds index.php at the end of the url, some sort of page still loads (albeit with broken paths, etc) so the technology is revealed.

is it possible to generate a 404 or some kind of error page if (isset($this->url->segment(5))) ? im using segments 3 and 4 only, so anything additional should give an error.

How does one usually answer a valid question from a client like this?