load!

# File actionpack/lib/action_dispatch/request/session.rb, line 268
        def load!
          if enabled?
            @id_was_initialized = true unless exists?
            id, session = @by.load_session @req
            options[:id] = id
            @delegate.replace(session.stringify_keys)
            @id_was = id unless @id_was_initialized
          end
          @id_was_initialized = true
          @loaded = true
        end