Add a shortcut for PATCH.

lib/src/base_client.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.
 
 library base_client;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:typed_data';
 
@@ skipping 60 matching lines @@
   /// content-type of the request will be set to
   /// `"application/x-www-form-urlencoded"`; this cannot be overridden.
   ///
   /// [encoding] defaults to UTF-8.
   ///
   /// For more fine-grained control over the request, use [send] instead.
   Future<Response> put(url, {Map<String, String> headers, body,
       Encoding encoding}) =>
     _sendUnstreamed("PUT", url, headers, body, encoding);
 
+  /// Sends an HTTP PATCH request with the given headers and body to the given
+  /// URL, which can be a [Uri] or a [String].
+  ///
+  /// [body] sets the body of the request. It can be a [String], a [List<int>]
+  /// or a [Map<String, String>]. If it's a String, it's encoded using
+  /// [encoding] and used as the body of the request. The content-type of the
+  /// request will default to "text/plain".
+  ///
+  /// If [body] is a List, it's used as a list of bytes for the body of the
+  /// request.
+  ///
+  /// If [body] is a Map, it's encoded as form fields using [encoding]. The
+  /// content-type of the request will be set to
+  /// `"application/x-www-form-urlencoded"`; this cannot be overridden.
+  ///
+  /// [encoding] defaults to UTF-8.
+  ///
+  /// For more fine-grained control over the request, use [send] instead.
+  Future<Response> patch(url, {Map<String, String> headers, body,
+      Encoding encoding}) =>
+    _sendUnstreamed("PATCH", url, headers, body, encoding);
+
   /// Sends an HTTP DELETE request with the given headers to the given URL,
   /// which can be a [Uri] or a [String].
   ///
   /// For more fine-grained control over the request, use [send] instead.
   Future<Response> delete(url, {Map<String, String> headers}) =>
     _sendUnstreamed("DELETE", url, headers);
 
   /// Sends an HTTP GET request with the given headers to the given URL, which
   /// can be a [Uri] or a [String], and returns a Future that completes to the
   /// body of the response as a String.
@@ skipping 69 matching lines @@
     }
     if (url is String) url = Uri.parse(url);
     throw new ClientException("$message.", url);
   }
 
   /// Closes the client and cleans up any resources associated with it. It's
   /// important to close each client when it's done being used; failing to do so
   /// can cause the Dart process to hang.
   void close() {}
 }