...Regular expression in SSI.
CGI interface for scripts (Executable files; Perl,PHP, or another external interpreters)
ISAPI interface.
Virtual hosts and directories
Mail
POP3 server.
SMTP server.
FTP server
HTTP proxy server
DNS server
DHCP server
HTTP TLS VPN server
wp-whois-proxy (wp.cgi) is a total rewrite (perl) of the famous GeekTools Whois Proxy with additional functions, a validated html/css interface, and explicit functions which should make it easier to maintain and expand.