The HTTP_, REMOTE_, and SERVER_ environment looks like this:
HTTP_ACCEPT=Accept: application/xhtml+xml,text/html;q=0.9,text/plain; HTTP_ACCEPT_CHARSET=ISO-8859-1,utf-8;q=0.7,*;q=0.7 HTTP_ACCEPT_ENCODING=gzip HTTP_ACCEPT_LANGUAGE=en-us,en;q=0.5 HTTP_CACHE_CONTROL=no-cache HTTP_CONNECTION=close HTTP_HOST=www.math.toronto.edu HTTP_PRAGMA=no-cache HTTP_USER_AGENT=CCBot/1.0 (+http://www.commoncrawl.org/bot.html) REMOTE_ADDR=38.103.63.60 REMOTE_PORT=47091 SERVER_ADDR=128.100.68.6 SERVER_ADMIN=webmaster@math.toronto.edu SERVER_NAME=www.math.toronto.edu SERVER_PORT=80 SERVER_PROTOCOL=HTTP/1.1 SERVER_SIGNATURE= SERVER_SOFTWARE=Apache