Single reverse proxy? No issues at all.
If I add multiple per some instructions on the caddy forums, nothing works - the docker container just continually reboots with no errors in the log.

Caddyfile:

fmd.domain.ca {
    reverse_proxy 10.179.200.199:8080
}

llama.domain.ca {
    reverse_proxy 192.168.3.199:3000
)

With only the fmd entry, works fine.