IP = 216.150.16.1
Content type of robots.txt is text/html; charset=utf-8!
Look up this url in the url tool
https://chart-studio.plotly.com/.well-known/acme-challenge: 404 application/json; charset=utf-8
https://chart-studio.plotly.com/.well-known/csvm: 404 text/html; charset=utf-8
https://chart-studio.plotly.com/.well-known/nostr.json: 404 text/html; charset=utf-8
https://chart-studio.plotly.com/.well-known/security.txt: 404 text/html; charset=utf-8
https://chart-studio.plotly.com/.well-known/traffic-advice: 404 text/html; charset=utf-8