protection_method_class

# File actionpack/lib/action_controller/metal/request_forgery_protection.rb, line 201
        def protection_method_class(name)
          case name
          when :null_session
            ProtectionMethods::NullSession
          when :reset_session
            ProtectionMethods::ResetSession
          when :exception
            ProtectionMethods::Exception
          when Class
            name
          else
            raise ArgumentError, "Invalid request forgery protection method, use :null_session, :exception, :reset_session, or a custom forgery protection class."
          end
        end