Fix settings pages being cacheable by the browser (#12714)

Fix #12255

app/controllers/oauth/authorizations_controller.rb

@@ -5,6 +5,7 @@ class Oauth::AuthorizationsController < Doorkeeper::AuthorizationsController
 
   before_action :store_current_location
   before_action :authenticate_resource_owner!
+  before_action :set_cache_headers
 
   include Localized
 
@@ -27,4 +28,8 @@ class Oauth::AuthorizationsController < Doorkeeper::AuthorizationsController
   def truthy_param?(key)
     ActiveModel::Type::Boolean.new.cast(params[key])
   end
+
+  def set_cache_headers
+    response.headers['Cache-Control'] = 'no-cache, no-store, max-age=0, must-revalidate'
+  end
 end