call

# File actionpack/lib/action_dispatch/journey/router.rb, line 56
      def call(env)
        env['PATH_INFO'] = Utils.normalize_path(env['PATH_INFO'])

        find_routes(env).each do |match, parameters, route|
          script_name, path_info, set_params = env.values_at('SCRIPT_NAME',
                                                             'PATH_INFO',
                                                             @params_key)

          unless route.path.anchored
            env['SCRIPT_NAME'] = (script_name.to_s + match.to_s).chomp('/')
            matched_path = match.post_match
            env['PATH_INFO']   = matched_path
            env['PATH_INFO']   = "/" + matched_path unless matched_path.start_with? "/"
          end

          env[@params_key] = (set_params || {}).merge parameters

          status, headers, body = route.app.call(env)

          if 'pass' == headers['X-Cascade']
            env['SCRIPT_NAME'] = script_name
            env['PATH_INFO']   = path_info
            env[@params_key]   = set_params
            next
          end

          return [status, headers, body]
        end

        return [404, {'X-Cascade' => 'pass'}, ['Not Found']]
      end