ActionDispatch::Session::StaleSessionCheck

# File actionpack/lib/action_dispatch/middleware/session/abstract_store.rb, line 50
      def extract_session_id(env)
        stale_session_check! { super }
      end

# File actionpack/lib/action_dispatch/middleware/session/abstract_store.rb, line 46
      def load_session(env)
        stale_session_check! { super }
      end

# File actionpack/lib/action_dispatch/middleware/session/abstract_store.rb, line 54
      def stale_session_check!
        yield
      rescue ArgumentError => argument_error
        if argument_error.message =~ %r{undefined class/module ([\w:]*\w)}
          begin
            # Note that the regexp does not allow $1 to end with a ':'.
            $1.constantize
          rescue LoadError, NameError
            raise ActionDispatch::Session::SessionRestoreError
          end
          retry
        else
          raise
        end
      end