You browser reveals a little bit about you when it requests a document from a server. As far as I know, that information is all contained in the environmental variables available to any cgi code, such as this one, which tells you what you are revealing and tells you a bit about the server.

Cookies contain information from a server that has been stored in your filespace. That's another story.

Environment variables have ascii values. A happyface () in the table below represents a null string.

Namevalue
GATEWAY_INTERFACECGI/1.1
HTTP_ACCEPT*/*
HTTP_ACCEPT_ENCODINGgzip, br, zstd, deflate
HTTP_CACHE_CONTROLmax-age=0
HTTP_CONNECTIONkeep-alive
HTTP_HOSTwww.plexoft.com
HTTP_USER_AGENTMozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
HTTP_VIA1.1 squid-proxy-5b5d847c96-pctc7 (squid/6.13)
HTTP_X_FORWARDED_FOR10.3.106.8
QUERY_STRING
REMOTE_ADDR216.73.216.215
REMOTE_PORT46857
REQUEST_METHODGET
REQUEST_SCHEMEhttp
REQUEST_URI/cgi-bin/informant.cgi
SERVER_ADDR208.185.81.39
SERVER_ADMINwebmaster@plexoft.com
SERVER_NAMEwww.plexoft.com
SERVER_PORT80
SERVER_PROTOCOLHTTP/1.1
SERVER_SIGNATURE
SERVER_SOFTWAREApache/2.4.53 (FreeBSD) OpenSSL/1.1.1u-freebsd PHP/7.4.28