serve

# File actionpack/lib/action_dispatch/journey/router.rb, line 31
      def serve(req)
        find_routes(req) do |match, parameters, route|
          set_params  = req.path_parameters
          path_info   = req.path_info
          script_name = req.script_name

          unless route.path.anchored
            req.script_name = (script_name.to_s + match.to_s).chomp("/")
            req.path_info = match.post_match
            req.path_info = "/" + req.path_info unless req.path_info.start_with? "/"
          end

          tmp_params = set_params.merge route.defaults
          parameters.each_pair { |key, val|
            tmp_params[key] = val.force_encoding(::Encoding::UTF_8)
          }

          req.path_parameters = tmp_params
          req.route_uri_pattern = route.path.spec.to_s

          _, headers, _ = response = route.app.serve(req)

          if "pass" == headers[Constants::X_CASCADE]
            req.script_name     = script_name
            req.path_info       = path_info
            req.path_parameters = set_params
            next
          end

          return response
        end

        [404, { Constants::X_CASCADE => "pass" }, ["Not Found"]]
      end