Add redirect support to the HTTP client

tests/standalone/io/web_socket_test.dart

 // Copyright (c) 2012, 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.
 //
 
 #import("dart:io");
 
 void testRequestResponseClientCloses(
     int totalConnections, int closeStatus, String closeReason) {
   HttpServer server = new HttpServer();
@@ skipping 96 matching lines @@
 
   server.listen("127.0.0.1", 0, 5);
 
   // Create a server which always responds with a redirect.
   server.defaultRequestHandler = (request, response) {
     response.statusCode = HttpStatus.MOVED_PERMANENTLY;
     response.outputStream.close();
   };
 
   HttpClientConnection conn = client.get("127.0.0.1", server.port, "/");
+  conn.followRedirects = false;
   WebSocketClientConnection wsconn = new WebSocketClientConnection(conn);
   wsconn.onNoUpgrade = (response) {
     Expect.equals(HttpStatus.MOVED_PERMANENTLY, response.statusCode);
     client.shutdown();
     server.close();
   };
 }
 
 void testUsePOST() {
   HttpServer server = new HttpServer();
@@ skipping 22 matching lines @@
 main() {
   testRequestResponseClientCloses(2, null, null);
   testRequestResponseClientCloses(2, 3001, null);
   testRequestResponseClientCloses(2, 3002, "Got tired");
   testRequestResponseServerCloses(2, null, null);
   testRequestResponseServerCloses(2, 3001, null);
   testRequestResponseServerCloses(2, 3002, "Got tired");
   testNoUpgrade();
   testUsePOST();
 }