path_parameters=

# File actionpack/lib/action_dispatch/http/parameters.rb, line 65
      def path_parameters=(parameters) # :nodoc:
        delete_header("action_dispatch.request.parameters")

        parameters = Request::Utils.set_binary_encoding(self, parameters, parameters[:controller], parameters[:action])
        # If any of the path parameters has an invalid encoding then
        # raise since it's likely to trigger errors further on.
        Request::Utils.check_param_encoding(parameters)

        set_header PARAMETERS_KEY, parameters
      rescue Rack::Utils::ParameterTypeError, Rack::Utils::InvalidParameterError => e
        raise ActionController::BadRequest.new("Invalid path parameters: #{e.message}")
      end