check_path_parameters!

# File actionpack/lib/action_dispatch/http/request.rb, line 56
    def check_path_parameters!
      # If any of the path parameters has an invalid encoding then
      # raise since it's likely to trigger errors further on.
      path_parameters.each do |key, value|
        next unless value.respond_to?(:valid_encoding?)
        unless value.valid_encoding?
          raise ActionController::BadRequest, "Invalid parameter: #{key} => #{value}"
        end
      end
    end