endpoint.ex

defmodule MinimalServer.Endpoint do
  # ...

  require Logger

  def start_link(_opts) do
    with {:ok, [port: port] = config} <- Application.fetch_env(:minimal_server, __MODULE__) do
      Logger.info("Starting server at http://localhost:#{port}/")
      Plug.Adapters.Cowboy2.http(__MODULE__, [], config)
    end
  end
end