IP = 104.21.6.170
Content type of robots.txt is text/html; charset=UTF-8!
Look up this url in the url tool
https://tr4ceflow.com/.well-known/acme-challenge: 521 text/html; charset=UTF-8
https://tr4ceflow.com/.well-known/csvm: 521 text/html; charset=UTF-8
https://tr4ceflow.com/.well-known/nostr.json: 521 text/html; charset=UTF-8
https://tr4ceflow.com/.well-known/security.txt: 521 text/html; charset=UTF-8
https://tr4ceflow.com/.well-known/traffic-advice: 521 text/html; charset=UTF-8