encyclo - 8:07 pm on Jul 30, 2010 (gmt 0)
I think you have to modify the source and recompile a custom Apache version. You could however try playing with the mod_headers [httpd.apache.org] directive, something like this might just work:
Header unset Server
Header set Server "mywebsite here"
Alternatively, if you just want to hide version numbers, then simply set ServerTokens [httpd.apache.org] to
ProductOnly, which will simply display "Apache":
Don't forget to go to php.ini and set expose_php to off while you're about it. :)
(Note: the above assumes you're running a dedicated server).