Here are sanitized values of some standard CGI environment variables:

Parent Pid =
PATH_INFO =
SERVER_SOFTWARE = WN/2.4.7
SERVER_NAME = hopf.math.northwestern.edu
SERVER_PROTOCOL = HTTP/1.1
SERVER_PORT = 80
AUTH_TYPE =
REMOTE_USER =
HTTP_ACCEPT = Accept: application/xhtmlxml,text/htmlq=0.9,text/plain
HTTP_ACCEPT_CHARSET = ISO-8859-1,utf-8q=0.7,*q=0.7
HTTP_ACCEPT_LANGUAGE = en-us,enq=0.5
HTTP_RANGE =
HTTP_REFERER =
HTTP_USER_AGENT = CCBot/1.0 http://www.commoncrawl.org/bot.html
HTTP_FROM =
HTTP_HOST = hopf.math.northwestern.edu
HTTP_COOKIE =
PATH_TRANSLATED =
SCRIPT_NAME = /docs/examples/nph-sample.cgi
SCRIPT_FILENAME = /home/wn/docs/examples/nph-sample.cgi
QUERY_STRING =
HTTP_X_FORWARDED_FOR =
HTTP_VIA =
REMOTE_HOST = 38.103.63.18
REMOTE_ADDR = 38.103.63.18
REQUEST_METHOD = GET

Non-CGI variables provided by the WN server:

URL_SCHEME = http
DOCUMENT_ROOT = /home/wn
WN_DIR_PATH = /home/wn/docs/examples
WN_KEY =
REMOTE_PORT = 34411
HTTP_POST_FILE =
HTTP_PUT_FILE =