Add new InternetAddress class with a static lookup function (including IPv6 results).

sdk/lib/io/http_impl.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart.io;
 
 class _HttpIncoming extends Stream<List<int>> {
   final int _transferLength;
   final Completer _dataCompleter = new Completer();
   Stream<List<int>> _stream;
@@ skipping 1820 matching lines @@
   }
 
   void destroy() => _socket.destroy();
 
   Future close() => _socket.close();
 
   Future<Socket> get done => _socket.done;
 
   int get port => _socket.port;
 
-  String get host => _socket.host;
+  InternetAddress get address => _socket.address;
 
   String get remoteHost => _socket.remoteHost;
 
   int get remotePort => _socket.remotePort;
 
   bool setOption(SocketOption option, bool enabled) {
     return _socket.setOption(option, enabled);
   }
 }
 
@@ skipping 138 matching lines @@
 
 
 class _RedirectInfo implements RedirectInfo {
   const _RedirectInfo(int this.statusCode,
                       String this.method,
                       Uri this.location);
   final int statusCode;
   final String method;
   final Uri location;
 }