I've noticed online people setting an env variable TUNNEL_TOKEN, but since I'm using self-hosted files, my token is a cert.pem.
Another issue however is that when I run this and try to browse to the page, I get the error ERR Request failed error="Unable to reach the origin service. The service may be down or it may not be responding to traffic from cloudflared: dial tcp 127.0.0.1:80: connect: connection refused.