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, br, zstd, deflate
HTTP_CONNECTION=keep-alive
REQUEST_METHOD=GET
HTTP_ACCEPT=*/*
SCRIPT_FILENAME=/opt/www/htmlgoon/environment.cgi
CONTEXT_PREFIX=
REQUEST_SCHEME=http
SERVER_SOFTWARE=Apache/2.4.59 () PHP/5.4.16
QUERY_STRING=
REMOTE_PORT=12687
HTTP_USER_AGENT=Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
SERVER_PORT=80
SERVER_SIGNATURE=
HTTP_CACHE_CONTROL=max-age=259200
REMOTE_ADDR=216.73.217.70
CONTEXT_DOCUMENT_ROOT=/opt/www/htmlgoon
SERVER_PROTOCOL=HTTP/1.1
HTTP_X_FORWARDED_FOR=10.1.23.181
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
REQUEST_URI=/environment.cgi
GATEWAY_INTERFACE=CGI/1.1
SERVER_ADDR=172.30.3.23
DOCUMENT_ROOT=/opt/www/htmlgoon
HTTP_VIA=1.1 squid-proxy-5b96dc6d46-h9jgq (squid/6.13)
HTTP_HOST=www.htmlgoon.com
UNIQUE_ID=aihSe4pKaR0IIVGqY4GpPQAAAAA