Add setup for responders gem

app/controllers/application_controller.rb

@@ -1,7 +1,11 @@
+require "application_responder"
 require 'open_food_network/referer_parser'
 require_dependency 'spree/authentication_helpers'
 
 class ApplicationController < ActionController::Base
+  self.responder = ApplicationResponder
+  respond_to :html
+
   protect_from_forgery
 
   prepend_before_action :restrict_iframes

lib/application_responder.rb

@@ -0,0 +1,8 @@
+class ApplicationResponder < ActionController::Responder
+  include Responders::FlashResponder
+  include Responders::HttpCacheResponder
+
+  # Redirects resources to the collection path (index action) instead
+  # of the resource path (show action) for POST/PUT/DELETE requests.
+  # include Responders::CollectionResponder
+end