Add redirect method to HttpResponse

sdk/lib/io/http.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;
 
 /**
  * HTTP status codes.
  */
 abstract class HttpStatus {
@@ skipping 827 matching lines @@
    * Returns the response headers.
    */
   HttpHeaders get headers;
 
   /**
    * Cookies to set in the client (in the 'set-cookie' header).
    */
   List<Cookie> get cookies;
 
   /**
+   * Respond with a redirect to [location].
+   *
+   * The URI in [location] should be absolute, but there are no checks
+   * to enforce that.
+   *
+   * By default the HTTP status code `HttpStatus.MOVED_TEMPORARILY`
+   * (`302`) is used for the redirect, but an alternative one can be
+   * specified using the [status] argument.
+   *
+   * This method will also call `close`, and the returned future is
+   * the furure returned by `close`.
+   */
+  Future redirect(Uri location, {int status: HttpStatus.MOVED_TEMPORARILY});
+
+  /**
    * Detaches the underlying socket from the HTTP server. When the
    * socket is detached the HTTP server will no longer perform any
    * operations on it.
    *
    * This is normally used when a HTTP upgrade request is received
    * and the communication should continue with a different protocol.
    */
   Future<Socket> detachSocket();
 
   /**
@@ skipping 610 matching lines @@
 
 class RedirectException implements HttpException {
   final String message;
   final List<RedirectInfo> redirects;
 
   const RedirectException(String this.message,
                           List<RedirectInfo> this.redirects);
 
   String toString() => "RedirectException: $message";
 }