zrok/etc/caddy/multiple_upstream.Caddyfile

# Multiple Backends Example
#
http:// {
    # Bind to the zrok share
	bind {{ .ZrokBindAddress }}

    # Handle paths starting with `/zrok/*`
    # This will also strip the `/zrok/` from the path before sending to the backend
	handle_path /zrok/* {
	    reverse_proxy https://zrok.io {
	        header_up Host zrok.io
	    }
	}

	# All other traffic goes to localhost:3000
	reverse_proxy /* 127.0.0.1:3000 {
		header_up Host localhost:3000
	}
}