IP = 209.51.188.116
Content type of robots.txt is text/html; charset=iso-8859-1!
Look up this url in the url tool
https://www.gnu.org/.well-known/acme-challenge: 403 text/html; charset=iso-8859-1
https://www.gnu.org/.well-known/csvm: 403 text/html; charset=iso-8859-1
https://www.gnu.org/.well-known/nostr.json: 403 text/html; charset=iso-8859-1
https://www.gnu.org/.well-known/security.txt: 403 text/html; charset=iso-8859-1
https://www.gnu.org/.well-known/traffic-advice: 403 text/html; charset=iso-8859-1