diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3e4ebd8ffe..8545e484a7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,17 @@
+## 0.11.3+13
+
+* remove boundary characters that package:http_parser cannot parse.
+
+## 0.11.3+12
+
+* Don't quote the boundary header for `MultipartRequest`. This is more
+  compatible with server quirks.
+
+## 0.11.3+11
+
+* Fix the SDK constraint to only include SDK versions that support importing
+  `dart:io` everywhere.
+
 ## 0.11.3+10
 
 * Stop using `dart:mirrors`.
diff --git a/lib/src/boundary_characters.dart b/lib/src/boundary_characters.dart
new file mode 100644
index 0000000000..03b7ac2d5e
--- /dev/null
+++ b/lib/src/boundary_characters.dart
@@ -0,0 +1,18 @@
+// Copyright (c) 2013, 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.
+
+/// All character codes that are valid in multipart boundaries. This is the
+/// intersection of the characters allowed in the `bcharsnospace` production
+/// defined in [RFC 2046][] and those allowed in the `token` production
+/// defined in [RFC 1521][].
+///
+/// [RFC 2046]: http://tools.ietf.org/html/rfc2046#section-5.1.1.
+/// [RFC 1521]: https://tools.ietf.org/html/rfc1521#section-4
+const List<int> BOUNDARY_CHARACTERS = const <int>[
+  39, 43, 95, 45, 46, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
+  65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83,
+  84, 85, 86, 87, 88, 89, 90, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106,
+  107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121,
+  122
+];
diff --git a/lib/src/multipart_request.dart b/lib/src/multipart_request.dart
index 2d3b318c9d..8132f80924 100644
--- a/lib/src/multipart_request.dart
+++ b/lib/src/multipart_request.dart
@@ -7,6 +7,7 @@ import 'dart:convert';
 import 'dart:math';
 
 import 'base_request.dart';
+import 'boundary_characters.dart';
 import 'byte_stream.dart';
 import 'multipart_file.dart';
 import 'utils.dart';
@@ -83,7 +84,7 @@ class MultipartRequest extends BaseRequest {
   ByteStream finalize() {
     // TODO(nweiz): freeze fields and files
     var boundary = _boundaryString();
-    headers['content-type'] = 'multipart/form-data; boundary="$boundary"';
+    headers['content-type'] = 'multipart/form-data; boundary=$boundary';
     super.finalize();
 
     var controller = new StreamController<List<int>>(sync: true);
@@ -117,16 +118,6 @@ class MultipartRequest extends BaseRequest {
     return new ByteStream(controller.stream);
   }
 
-  /// All character codes that are valid in multipart boundaries. From
-  /// http://tools.ietf.org/html/rfc2046#section-5.1.1.
-  static const List<int> _BOUNDARY_CHARACTERS = const <int>[
-    39, 40, 41, 43, 95, 44, 45, 46, 47, 58, 61, 63, 48, 49, 50, 51, 52, 53, 54,
-    55, 56, 57, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80,
-    81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 97, 98, 99, 100, 101, 102, 103,
-    104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118,
-    119, 120, 121, 122
-  ];
-
   /// Returns the header string for a field. The return value is guaranteed to
   /// contain only ASCII characters.
   String _headerForField(String name, String value) {
@@ -167,7 +158,7 @@ class MultipartRequest extends BaseRequest {
     var prefix = "dart-http-boundary-";
     var list = new List<int>.generate(_BOUNDARY_LENGTH - prefix.length,
         (index) =>
-            _BOUNDARY_CHARACTERS[_random.nextInt(_BOUNDARY_CHARACTERS.length)],
+            BOUNDARY_CHARACTERS[_random.nextInt(BOUNDARY_CHARACTERS.length)],
         growable: false);
     return "$prefix${new String.fromCharCodes(list)}";
   }
diff --git a/lib/src/utils.dart b/lib/src/utils.dart
index c19d354b9c..3e9fdf39bb 100644
--- a/lib/src/utils.dart
+++ b/lib/src/utils.dart
@@ -95,7 +95,7 @@ Uint8List toUint8List(List<int> input) {
 /// Calls [onDone] once [stream] (a single-subscription [Stream]) is finished.
 /// The return value, also a single-subscription [Stream] should be used in
 /// place of [stream] after calling this method.
-Stream/*<T>*/ onDone/*<T>*/(Stream/*<T>*/ stream, void onDone()) =>
+Stream<T> onDone<T>(Stream<T> stream, void onDone()) =>
     stream.transform(new StreamTransformer.fromHandlers(handleDone: (sink) {
       sink.close();
       onDone();