How to use self hosted version

Hi! I’m struggling with running Docker.

I’m getting it running on the CLI, and Docker Desktop shows that it’s running, getting "
[BACKEND][2022-03-29 09:37:51] 127.0.0.1:48798 - “GET /_health/ HTTP/1.1” 200e(B" in the status — BUT I’m getting on the browser:

This page isn’t working

localhost didn’t send any data.
ERR_EMPTY_RESPONSE

Is this a config error, user error, or something else?

(I’m running latest Chrome, on Mac OS Big Sur)