initial Rails application

app/controllers/application_controller.rb

@@ -0,0 +1,7 @@
+class ApplicationController < ActionController::Base
+  # Only allow modern browsers supporting webp images, web push, badges, import maps, CSS nesting, and CSS :has.
+  allow_browser versions: :modern
+
+  # Changes to the importmap will invalidate the etag for HTML responses
+  stale_when_importmap_changes
+end