diff --git a/CHANGELOG.md b/CHANGELOG.md
index ef7ad449..e618a19a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+# 2.0.0-alpha.14
+* Patch `HttpResponseContext._openStream` to send content-length.
+
 # 2.0.0-alpha.13
 
 - Fixed a logic error in `HttpResponseContext` that prevented status codes from being sent.
diff --git a/lib/src/core/response_context.dart b/lib/src/core/response_context.dart
index 9a858717..eccea030 100644
--- a/lib/src/core/response_context.dart
+++ b/lib/src/core/response_context.dart
@@ -20,7 +20,8 @@ final RegExp _straySlashes = new RegExp(r'(^/+)|(/+$)');
 abstract class ResponseContext<RawResponse>
     implements StreamSink<List<int>>, StringSink {
   final Map properties = {};
-  final Map<String, String> _headers = new CaseInsensitiveMap.from({
+  final CaseInsensitiveMap<String> _headers =
+      new CaseInsensitiveMap<String>.from({
     'content-type': 'text/plain',
     'server': 'angel',
   });
@@ -56,7 +57,7 @@ abstract class ResponseContext<RawResponse>
   /// Headers that will be sent to the user.
   ///
   /// Note that if you have already started writing to the underlying stream, headers will not persist.
-  Map<String, String> get headers => _headers;
+  CaseInsensitiveMap<String> get headers => _headers;
 
   /// Serializes response data into a String.
   ///
diff --git a/lib/src/http/http_response_context.dart b/lib/src/http/http_response_context.dart
index 87a9d3fd..50e3c546 100644
--- a/lib/src/http/http_response_context.dart
+++ b/lib/src/http/http_response_context.dart
@@ -86,6 +86,12 @@ class HttpResponseContext extends ResponseContext<HttpResponse> {
         ..statusCode = statusCode
         ..cookies.addAll(cookies);
       headers.forEach(rawResponse.headers.set);
+
+      if (headers.containsKey('content-length')) {
+        rawResponse.contentLength = int.tryParse(headers['content-length']) ??
+            rawResponse.contentLength;
+      }
+
       rawResponse.headers.contentType = new ContentType(
           contentType.type, contentType.subtype,
           charset: contentType.parameters['charset'],
diff --git a/pubspec.yaml b/pubspec.yaml
index 42f0c2c8..ee352e0f 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: angel_framework
-version: 2.0.0-alpha.13
+version: 2.0.0-alpha.14
 description: A high-powered HTTP server with dependency injection, routing and much more.
 author: Tobe O <thosakwe@gmail.com>
 homepage: https://github.com/angel-dart/angel_framework