IP = 18.238.136.70
Content type of robots.txt is text/html!
Look up this url in the url tool
https://zh-v2.d2l.ai/.well-known/acme-challenge: 200 text/html
https://zh-v2.d2l.ai/.well-known/csvm: 200 text/html
https://zh-v2.d2l.ai/.well-known/nostr.json: 200 text/html
https://zh-v2.d2l.ai/.well-known/security.txt: 200 text/html
https://zh-v2.d2l.ai/.well-known/traffic-advice: 200 text/html