Does not have all the features you listed, but I used Rustypaste in the past for sharing all kind of things and was quite happy with it.

Nice catch and thanks for sharing. Will definitely check it out.

Fully agree to this summary. traefik also gave me a hard time initially, but once you have the quirks worked out, it works as promised.

Caddy is absolutely on my list as an alternative, but the lack of docker label support is currently the main roadblocker for me.