I'm doubtful (though it would be awesome if) Caddy could proxy both HTTPs and MQTTs over the same port (443)... In traefik's case, I don't think it's possible. It can proxy to multiple HTTP backends, other woth TCP backends its pretty much a one-to-one mapping of port to backend... an exception may be if the proxy can detect the hostname (SNI) on the cert being used/requested and use that to route... So really the question is... does MQTT(s) support SNI/TLS? if so, it's possible 😉