diff --git a/CHANGELOG.md b/CHANGELOG.md
index b1dcdb89c11..55bd6d1f4e7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -82,6 +82,7 @@
 - `convertNativeToDart_Dictionary()` now converts objects recursively, this
   fixes APIs like MediaStreamTrack.getCapabilities that convert between Maps and
   browser Dictionaries. [#44319]
+- Added some access-control HTTP header names to `HttpHeaders`.
 
 [#44319]: https://github.com/dart-lang/sdk/issues/44319
 
@@ -90,6 +91,7 @@
 - BREAKING CHANGE (for pre-migrated null safe code): `HttpClient`'s
   `.authenticate` and `.authenticateProxy` setter callbacks must now accept a
   nullable `realm` argument.
+- Added some access-control HTTP header names to `HttpHeaders`.
 
 #### `dart:typed_data`
 
diff --git a/pkg/front_end/testcases/nnbd_mixed/mock_http_headers.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd_mixed/mock_http_headers.dart.weak.outline.expect
index 525fab56fbf..4e5f43d7223 100644
--- a/pkg/front_end/testcases/nnbd_mixed/mock_http_headers.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/mock_http_headers.dart.weak.outline.expect
@@ -170,8 +170,8 @@ Evaluated: MapLiteral @ org-dartlang-testcase:///mock_http_headers.dart:13:7 ->
 Evaluated: SymbolLiteral @ org-dartlang-testcase:///mock_http_headers.dart:13:7 -> SymbolConstant(#noFolding)
 Evaluated: ListLiteral @ org-dartlang-testcase:///mock_http_headers.dart:13:7 -> ListConstant(const <Type*>[])
 Evaluated: MapLiteral @ org-dartlang-testcase:///mock_http_headers.dart:13:7 -> InstanceConstant(const _ImmutableMap<Symbol*, dynamic>{_ImmutableMap._kvPairs: const <dynamic>[]})
-Evaluated: SymbolLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:774:8 -> SymbolConstant(#clear)
-Evaluated: ListLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:774:8 -> ListConstant(const <Type*>[])
-Evaluated: ListLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:774:8 -> ListConstant(const <dynamic>[])
-Evaluated: MapLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:774:8 -> InstanceConstant(const _ImmutableMap<Symbol*, dynamic>{_ImmutableMap._kvPairs: const <dynamic>[]})
+Evaluated: SymbolLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:782:8 -> SymbolConstant(#clear)
+Evaluated: ListLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:782:8 -> ListConstant(const <Type*>[])
+Evaluated: ListLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:782:8 -> ListConstant(const <dynamic>[])
+Evaluated: MapLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:782:8 -> InstanceConstant(const _ImmutableMap<Symbol*, dynamic>{_ImmutableMap._kvPairs: const <dynamic>[]})
 Extra constant evaluation: evaluated: 268, effectively constant: 91
diff --git a/sdk/lib/_http/http.dart b/sdk/lib/_http/http.dart
index abc401e3080..d3034128787 100644
--- a/sdk/lib/_http/http.dart
+++ b/sdk/lib/_http/http.dart
@@ -391,16 +391,24 @@ abstract class HttpHeaders {
   static const acceptEncodingHeader = "accept-encoding";
   static const acceptLanguageHeader = "accept-language";
   static const acceptRangesHeader = "accept-ranges";
+  @Since("2.14")
   static const accessControlAllowCredentialsHeader =
       'access-control-allow-credentials';
+  @Since("2.14")
   static const accessControlAllowHeadersHeader = 'access-control-allow-headers';
+  @Since("2.14")
   static const accessControlAllowMethodsHeader = 'access-control-allow-methods';
+  @Since("2.14")
   static const accessControlAllowOriginHeader = 'access-control-allow-origin';
+  @Since("2.14")
   static const accessControlExposeHeadersHeader =
       'access-control-expose-headers';
+  @Since("2.14")
   static const accessControlMaxAgeHeader = 'access-control-max-age';
+  @Since("2.14")
   static const accessControlRequestHeadersHeader =
       'access-control-request-headers';
+  @Since("2.14")
   static const accessControlRequestMethodHeader =
       'access-control-request-method';
   static const ageHeader = "age";
@@ -2315,7 +2323,9 @@ class HttpException implements IOException {
   const HttpException(this.message, {this.uri});
 
   String toString() {
-    var b = new StringBuffer()..write('HttpException: ')..write(message);
+    var b = new StringBuffer()
+      ..write('HttpException: ')
+      ..write(message);
     var uri = this.uri;
     if (uri != null) {
       b.write(', uri = $uri');