Reset Frame.Scheme on each request (#366).

src/Microsoft.AspNet.Server.Kestrel/Http/Frame.FeatureCollection.cs

@@ -24,7 +24,6 @@ namespace Microsoft.AspNet.Server.Kestrel.Http
         // then the list of `implementedFeatures` in the generated code project MUST also be updated.
         // See also: tools/Microsoft.AspNet.Server.Kestrel.GeneratedCode/FrameFeatureCollection.cs
 
-        private string _scheme;
         private string _pathBase;
         private int _featureRevision;
 
@@ -90,12 +89,12 @@ namespace Microsoft.AspNet.Server.Kestrel.Http
         {
             get
             {
-                return _scheme ?? "http";
+                return Scheme ?? "http";
             }
 
             set
             {
-                _scheme = value;
+                Scheme = value;
             }
         }
 

src/Microsoft.AspNet.Server.Kestrel/Http/Frame.cs

@@ -67,6 +67,7 @@ namespace Microsoft.AspNet.Server.Kestrel.Http
             Reset();
         }
 
+        public string Scheme { get; set; }
         public string Method { get; set; }
         public string RequestUri { get; set; }
         public string Path { get; set; }
@@ -102,6 +103,7 @@ namespace Microsoft.AspNet.Server.Kestrel.Http
             ResetResponseHeaders();
             ResetFeatureCollection();
 
+            Scheme = null;
             Method = null;
             RequestUri = null;
             Path = null;

test/Microsoft.AspNet.Server.KestrelTests/FrameFacts.cs

@@ -0,0 +1,26 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using Microsoft.AspNet.Http.Features;
+using Microsoft.AspNet.Server.Kestrel.Http;
+using Xunit;
+
+namespace Microsoft.AspNet.Server.KestrelTests
+{
+    public class FrameFacts
+    {
+        [Fact]
+        public void ResetResetsScheme()
+        {
+            // Arrange
+            var frame = new Frame(new ConnectionContext() { DateHeaderValueManager = new DateHeaderValueManager() });
+            frame.Scheme = "https";
+
+            // Act
+            frame.Reset();
+
+            // Assert
+            Assert.Equal("http", frame.Get<IHttpRequestFeature>().Scheme);
+        }
+    }
+}