    # File lib/phusion_passenger/rack/application_spawner.rb, line 96
            def initialize(options)
                    super()
                    @options          = sanitize_spawn_options(options)
                    @app_root         = @options["app_root"]
                    @canonicalized_app_root = canonicalize_path(@app_root)
                    self.max_idle_time = DEFAULT_APP_SPAWNER_MAX_IDLE_TIME
                    define_message_handler(:spawn_application, :handle_spawn_application)
            end