diff --git a/src/Kestrel/ServerRequest.cs b/src/Kestrel/ServerRequest.cs
index b167f50278..27398ca987 100644
--- a/src/Kestrel/ServerRequest.cs
+++ b/src/Kestrel/ServerRequest.cs
@@ -175,6 +175,11 @@ namespace Kestrel
             }
         }
 
+        bool IHttpResponseFeature.HeadersSent
+        {
+            get { return _frame.HeadersSent; }
+        }
+
         void IHttpResponseFeature.OnSendingHeaders(Action<object> callback, object state)
         {
             _frame.OnSendingHeaders(callback, state);
diff --git a/src/Microsoft.AspNet.Server.Kestrel/Http/Frame.cs b/src/Microsoft.AspNet.Server.Kestrel/Http/Frame.cs
index 1f8552459b..c20ae236b1 100644
--- a/src/Microsoft.AspNet.Server.Kestrel/Http/Frame.cs
+++ b/src/Microsoft.AspNet.Server.Kestrel/Http/Frame.cs
@@ -54,6 +54,7 @@ namespace Microsoft.AspNet.Server.Kestrel.Http
 
         Mode _mode;
         private bool _resultStarted;
+        private bool _headersSent;
         private bool _keepAlive;
 
         /*
@@ -89,6 +90,10 @@ namespace Microsoft.AspNet.Server.Kestrel.Http
 
         public Stream DuplexStream { get; set; }
 
+        public bool HeadersSent
+        {
+            get { return _headersSent; }
+        }
 
 
         /*
@@ -276,6 +281,8 @@ namespace Microsoft.AspNet.Server.Kestrel.Http
 
             FireOnSendingHeaders();
 
+            _headersSent = true;
+
             var status = ReasonPhrases.ToStatus(StatusCode, ReasonPhrase);
 
             var responseHeader = CreateResponseHeader(status, ResponseHeaders);