Content-Type header is now stored with a case insensitive key.

pkg/http/test/request_test.dart

Index: pkg/http/test/request_test.dart
diff --git a/pkg/http/test/request_test.dart b/pkg/http/test/request_test.dart
index 929cc636f0299d05e1720ce396447165da1951ae..31c7e91803527fc276c68da168e5f6eca8fc3cc2 100644
--- a/pkg/http/test/request_test.dart
+++ b/pkg/http/test/request_test.dart
@@ -1,4 +1,4 @@
-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2014, 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.
 
@@ -271,6 +271,14 @@ void main() {
       expect(request.headers[HttpHeaders.CONTENT_TYPE], isNull);
     });
 
+    test('name is case insensitive', () {
+      var request = new http.Request('POST', dummyUrl);
+      request.headers[HttpHeaders.CONTENT_TYPE.toUpperCase()] =
+          'application/json';
+      expect(request.headers[HttpHeaders.CONTENT_TYPE.toLowerCase()],
+             equals('application/json'));
+    });
+
     test('is set to application/x-www-form-urlencoded with charset utf-8 if '
         'bodyFields is set', () {
       var request = new http.Request('POST', dummyUrl);