Move default headers configuration in app config

config/application.rb

@@ -30,5 +30,7 @@ module Scube
 
     # Do not swallow errors in after_commit/after_rollback callbacks.
     config.active_record.raise_in_transactional_callbacks = true
+
+    config.action_dispatch.default_headers.clear
   end
 end

config/initializers/default_headers.rb

@@ -1 +0,0 @@
-Rails.application.config.action_dispatch.default_headers.clear