anchor.diff:    Transport operator [](String name) => _transports[name];
     final Map<String, dynamic> requestHeaders = {};
     ClientCodec codec = DefaultClientCodec.instance;
  +  Duration timeout = new Duration(seconds: 30);
     List<Uri> _urilist = [];
     List<Uri> get uris => _urilist;
     set uris(List<Uri> value) {
  
positive.code: }
  
  class Client {
    static final List<MapEntry<String, TransportCreator>> _creators = [];
    static final Map<String, String> _schemes = {};
    static void Register<T extends Transport>(
        String name, TransportCreator<T> creator) {
      var schemes = creator.schemes;
      _creators.add(new MapEntry(name, creator));
      for (final scheme in schemes) {
        _schemes[scheme] = name;
      }
  
negative.code: |                                                          |
  | hprose Client for Dart.                                  |
  |                                                          |
  | LastModified: Feb 28, 2019                               |
  | Author: Ma Bingyao <andot@hprose.com>                    |
  |                                                          |
  \*________________________________________________________*/
  