After 'mix phx.new generic_rest_server --binary-id --no-install'

lib/generic_rest_server_web/controllers/page_controller.ex

@@ -0,0 +1,7 @@
+defmodule GenericRestServerWeb.PageController do
+  use GenericRestServerWeb, :controller
+
+  def home(conn, _params) do
+    render(conn, :home)
+  end
+end