diff --git a/CHANGELOG.md b/CHANGELOG.md
index eba45439942..42b3618bb38 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 ## 2.1.0-dev.XX.0
 
+#### `dart:io`
+Added new HTTP status codes.
+
 #### `dart:html`
 Fixed Service Workers and any Promise/Future API with a Dictionary parameter.
 
diff --git a/sdk/lib/_http/http.dart b/sdk/lib/_http/http.dart
index 29e785b699a..f7416069a7a 100644
--- a/sdk/lib/_http/http.dart
+++ b/sdk/lib/_http/http.dart
@@ -36,6 +36,7 @@ part 'websocket_impl.dart';
 abstract class HttpStatus {
   static const int continue_ = 100;
   static const int switchingProtocols = 101;
+  static const int processing = 102;
   static const int ok = 200;
   static const int created = 201;
   static const int accepted = 202;
@@ -43,6 +44,9 @@ abstract class HttpStatus {
   static const int noContent = 204;
   static const int resetContent = 205;
   static const int partialContent = 206;
+  static const int multiStatus = 207;
+  static const int alreadyReported = 208;
+  static const int imUsed = 226;
   static const int multipleChoices = 300;
   static const int movedPermanently = 301;
   static const int found = 302;
@@ -51,6 +55,7 @@ abstract class HttpStatus {
   static const int notModified = 304;
   static const int useProxy = 305;
   static const int temporaryRedirect = 307;
+  static const int permanentRedirect = 308;
   static const int badRequest = 400;
   static const int unauthorized = 401;
   static const int paymentRequired = 402;
@@ -69,13 +74,28 @@ abstract class HttpStatus {
   static const int unsupportedMediaType = 415;
   static const int requestedRangeNotSatisfiable = 416;
   static const int expectationFailed = 417;
+  static const int misdirectedRequest = 421;
+  static const int unprocessableEntity = 422;
+  static const int locked = 423;
+  static const int failedDependency = 424;
   static const int upgradeRequired = 426;
+  static const int preconditionRequired = 428;
+  static const int tooManyRequests = 429;
+  static const int requestHeaderFieldsTooLarge = 431;
+  static const int connectionClosedWithoutResponse = 444;
+  static const int unavailableForLegalReasons = 451;
+  static const int clientClosedRequest = 499;
   static const int internalServerError = 500;
   static const int notImplemented = 501;
   static const int badGateway = 502;
   static const int serviceUnavailable = 503;
   static const int gatewayTimeout = 504;
   static const int httpVersionNotSupported = 505;
+  static const int variantAlsoNegotiates = 506;
+  static const int insufficientStorage = 507;
+  static const int loopDetected = 508;
+  static const int notExtended = 510;
+  static const int networkAuthenticationRequired = 511;
   // Client generated status code.
   static const int networkConnectTimeoutError = 599;