Here are the typical environment variable names on Apache
SCRIPT_NAME=/environment.cgi
SERVER_NAME=www.htmlgoon.com
SERVER_ADMIN=webmaster@gidon.com
HTTP_ACCEPT_ENCODING=gzip
HTTP_CONNECTION=close
REQUEST_METHOD=GET
HTTP_ACCEPT=Accept: application/xhtml+xml,text/html;q=0.9,text/plain;
SCRIPT_FILENAME=/opt/www/htmlgoon/environment.cgi
REDIRECT_URL=/environment.cgi
SERVER_SOFTWARE=Apache/1.3.34 (Unix) mod_gzip/1.3.26.1a
HTTP_ACCEPT_CHARSET=ISO-8859-1,utf-8;q=0.7,*;q=0.7
QUERY_STRING=
REMOTE_PORT=57232
HTTP_USER_AGENT=CCBot/1.0 (+http://www.commoncrawl.org/bot.html)
SERVER_SIGNATURE=