Auto SSL - Caddy fails to start

Description:

Trying to set up SSL trough caddy and it the service just stops after a second of running. It works fine with tls self_signed

Server Setup Information:

• Version of Rocket.Chat Server: 0.63.1
• Operating System: Ubuntu
• Deployment Method(snap/docker/tar/etc): Snap
• Number of Running Instances: 1

Steps to Reproduce:

1. Edit caddy file according to documentation
2. Restart the service
3. Caddy stops

Expected behavior:

Caddy to keep running

Relevant logs:

Apr 10 07:19:33 ns544081 systemd[1]: Started Service for snap application rocketchat-server.rocketchat-caddy.
Apr 10 07:19:33 ns544081 rocketchat-server.rocketchat-caddy[17692]: 2018/04/10 07:19:33 /var/snap/rocketchat-server/1248/Caddyfile:2 - Error during parsing: Unknown directive 'http://www.inv****

Apr 10 07:19:33 ns544081 systemd[1]: snap.rocketchat-server.rocketchat-caddy.service: Main process exited, code=exited, status=1/FAILURE
Apr 10 07:19:33 ns544081 systemd[1]: snap.rocketchat-server.rocketchat-caddy.service: Unit entered failed state.

Start with the Snap Caddy configuration at /var/snap/rocketchat-server/1248/Caddyfile and compare it with the documented setup. Reproduce the restart and inspect the reported parsing error; done means the Caddyfile parses and the snap service remains running.