Thanks!
I think that setting the hostname and port via CLI args is a better approach since it allows launching more than one instance of the server.

👋 @nvdv , Sometimes, when I specify my starting command with args in the Procfile file, these args would not been loaded.

For example,

web: prof -r -p 8080

That's why, I propose you this alternative to configure remote server.

Hope you think that this new way would be interesting.