Add support for using an URL for establishing HTTP connections

runtime/bin/http.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.
 
 /**
  * HTTP status codes.
  */
 interface HttpStatus {
   static final int CONTINUE = 100;
   static final int SWITCHING_PROTOCOLS = 101;
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    * used to register callbacks for asynchronous events on the HTTP
    * connection. The "Host" header for the request will be set to the
    * value [host]:[port]. This can be overridden through the
    * HttpClientRequest interface before the request is sent. NOTE if
    * [host] is an IP address this will still be set in the "Host"
    * header.
    */
   HttpClientConnection open(String method, String host, int port, String path);
 
   /**
+   * Opens a HTTP connection. The returned [HttpClientConnection] is
+   * used to register callbacks for asynchronous events on the HTTP
+   * connection. The "Host" header for the request will be set based
+   * the host and port specified in [url]. This can be overridden
+   * through the HttpClientRequest interface before the request is
+   * sent. NOTE if the host is specified as an IP address this will
+   * still be set in the "Host" header.
+   */
+  HttpClientConnection openUrl(String method, Uri url);
+
+  /**
    * Opens a HTTP connection using the GET method. See [open] for details.
    */
   HttpClientConnection get(String host, int port, String path);
 
   /**
+   * Opens a HTTP connection using the GET method. See [openUrl] for details.
+   */
+  HttpClientConnection getUrl(Uri url);
+
+  /**
    * Opens a HTTP connection using the POST method. See [open] for details.
    */
   HttpClientConnection post(String host, int port, String path);
 
   /**
+   * Opens a HTTP connection using the POST method. See [openUrl] for details.
+   */
+  HttpClientConnection postUrl(Uri url);
+
+  /**
    * Shutdown the HTTP client releasing all resources.
    */
   void shutdown();
 }
 
 
 /**
  * A [HttpClientConnection] is returned by all [HttpClient] methods
  * that initiate a connection to an HTTP server. The handlers will be
  * called as the connection state progresses.
@@ skipping 132 matching lines @@
    */
   InputStream get inputStream();
 }
 
 
 class HttpException implements Exception {
   const HttpException([String this.message = ""]);
   String toString() => "HttpException: $message";
   final String message;
 }