I tried to launch Pluto with
Pluto.run(launch_browser=false, require_secret_for_access=false, root_url="blah/")
Pluto responds with Go to blah/ in your browser to start writing ~ have fun!
If I try to access http://localhost:1234/blah/, I get a 404 error, and the server (I do make a connection to the server) says "Not found!".
What am I doing wrong?