Handle IPv6 addresses for HTTP client requests

tests/standalone/io/http_ipv6_test.dart

+// (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.
+
+// VMOptions=
+// VMOptions=--short_socket_read
+// VMOptions=--short_socket_write
+// VMOptions=--short_socket_read --short_socket_write
+
+import "package:expect/expect.dart";
+import "dart:async";
+import "dart:isolate";
+import "dart:io";
+
+// Client makes a HTTP 1.0 request without connection keep alive. The
+// server sets a content length but still needs to close the
+// connection as there is no keep alive.
+void testHttpIPv6() {
+  HttpServer.bind("::", 0).then((server) {
+    server.listen((HttpRequest request) {
+      Expect.equals(request.headers["host"][0], "[::]:${server.port}");
+      Expect.equals(request.requestedUri.host, "::");
+      request.response.close();
+    });
+
+    var client = new HttpClient();
+    var url = Uri.parse('http://[::]:${server.port}/xxx');
+    Expect.equals(url.host, '::');
+    client.openUrl('GET', url)
+        .then((request) => request.close())
+        .then((response) {
+          Expect.equals(response.statusCode, HttpStatus.OK);
+        }).whenComplete(() {
+          server.close();
+          client.close();
+        });
+  });
+}
+
+
+
+void main() {
+  testHttpIPv6();
+}