Enable nullable on Kestrel generated code

src/Hosting/TestHost/src/ClientHandler.cs

@@ -184,7 +184,7 @@ protected override async Task<HttpResponseMessage> SendAsync(
             // Copy trailers to the response message when the response stream is complete
             contextBuilder.RegisterResponseReadCompleteCallback(context =>
             {
-                var responseTrailersFeature = context.Features.Get<IHttpResponseTrailersFeature>();
+                var responseTrailersFeature = context.Features.Get<IHttpResponseTrailersFeature>()!;
 
                 foreach (var trailer in responseTrailersFeature.Trailers)
                 {
@@ -196,7 +196,7 @@ protected override async Task<HttpResponseMessage> SendAsync(
             var httpContext = await contextBuilder.SendAsync(cancellationToken);
 
             response.StatusCode = (HttpStatusCode)httpContext.Response.StatusCode;
-            response.ReasonPhrase = httpContext.Features.Get<IHttpResponseFeature>().ReasonPhrase;
+            response.ReasonPhrase = httpContext.Features.Get<IHttpResponseFeature>()!.ReasonPhrase;
             response.RequestMessage = request;
             response.Version = request.Version;
 

src/Hosting/TestHost/src/HttpContextBuilder.cs

@@ -225,7 +225,7 @@ internal async Task ReturnResponseMessageAsync()
                 {
                     newFeatures[pair.Key] = pair.Value;
                 }
-                var serverResponseFeature = _httpContext.Features.Get<IHttpResponseFeature>();
+                var serverResponseFeature = _httpContext.Features.Get<IHttpResponseFeature>()!;
                 // The client gets a deep copy of this so they can interact with the body stream independently of the server.
                 var clientResponseFeature = new HttpResponseFeature()
                 {

src/Http/Http.Extensions/src/ResponseExtensions.cs

@@ -16,7 +16,7 @@ public static void Clear(this HttpResponse response)
                 throw new InvalidOperationException("The response cannot be cleared, it has already started sending.");
             }
             response.StatusCode = 200;
-            response.HttpContext.Features.Get<IHttpResponseFeature>().ReasonPhrase = null;
+            response.HttpContext.Features.Get<IHttpResponseFeature>()!.ReasonPhrase = null;
             response.Headers.Clear();
             if (response.Body.CanSeek)
             {

src/Http/Http.Extensions/src/SendFileResponseExtensions.cs

@@ -143,7 +143,7 @@ private static async Task SendFileAsyncCore(HttpResponse response, string fileNa
         {
             var useRequestAborted = !cancellationToken.CanBeCanceled;
             var localCancel = useRequestAborted ? response.HttpContext.RequestAborted : cancellationToken;
-            var sendFile = response.HttpContext.Features.Get<IHttpResponseBodyFeature>();
+            var sendFile = response.HttpContext.Features.Get<IHttpResponseBodyFeature>()!;
 
             try
             {

src/Http/Http.Features/src/FeatureCollection.cs

@@ -98,7 +98,7 @@ public IEnumerator<KeyValuePair<Type, object>> GetEnumerator()
             return (TFeature?)this[typeof(TFeature)];
         }
 
-        public void Set<TFeature>(TFeature instance)
+        public void Set<TFeature>(TFeature? instance)
         {
             this[typeof(TFeature)] = instance;
         }

src/Http/Http.Features/src/IFeatureCollection.cs

@@ -33,13 +33,13 @@ public interface IFeatureCollection : IEnumerable<KeyValuePair<Type, object>>
         /// </summary>
         /// <typeparam name="TFeature">The feature key.</typeparam>
         /// <returns>The requested feature, or null if it is not present.</returns>
-        TFeature Get<TFeature>();
+        TFeature? Get<TFeature>();
 
         /// <summary>
         /// Sets the given feature in the collection.
         /// </summary>
         /// <typeparam name="TFeature">The feature key.</typeparam>
         /// <param name="instance">The feature value.</param>
-        void Set<TFeature>(TFeature instance);
+        void Set<TFeature>(TFeature? instance);
     }
 }

src/Http/Http.Features/src/PublicAPI.Shipped.txt

@@ -26,7 +26,7 @@ Microsoft.AspNetCore.Http.Features.FeatureCollection.FeatureCollection(Microsoft
 Microsoft.AspNetCore.Http.Features.FeatureCollection.Get<TFeature>() -> TFeature?
 Microsoft.AspNetCore.Http.Features.FeatureCollection.GetEnumerator() -> System.Collections.Generic.IEnumerator<System.Collections.Generic.KeyValuePair<System.Type!, object!>>!
 Microsoft.AspNetCore.Http.Features.FeatureCollection.IsReadOnly.get -> bool
-Microsoft.AspNetCore.Http.Features.FeatureCollection.Set<TFeature>(TFeature instance) -> void
+Microsoft.AspNetCore.Http.Features.FeatureCollection.Set<TFeature>(TFeature? instance) -> void
 Microsoft.AspNetCore.Http.Features.FeatureCollection.this[System.Type! key].get -> object?
 Microsoft.AspNetCore.Http.Features.FeatureCollection.this[System.Type! key].set -> void
 Microsoft.AspNetCore.Http.Features.FeatureReference<T>
@@ -46,10 +46,10 @@ Microsoft.AspNetCore.Http.Features.HttpsCompressionMode.Compress = 2 -> Microsof
 Microsoft.AspNetCore.Http.Features.HttpsCompressionMode.Default = 0 -> Microsoft.AspNetCore.Http.Features.HttpsCompressionMode
 Microsoft.AspNetCore.Http.Features.HttpsCompressionMode.DoNotCompress = 1 -> Microsoft.AspNetCore.Http.Features.HttpsCompressionMode
 Microsoft.AspNetCore.Http.Features.IFeatureCollection
-Microsoft.AspNetCore.Http.Features.IFeatureCollection.Get<TFeature>() -> TFeature
+Microsoft.AspNetCore.Http.Features.IFeatureCollection.Get<TFeature>() -> TFeature?
 Microsoft.AspNetCore.Http.Features.IFeatureCollection.IsReadOnly.get -> bool
 Microsoft.AspNetCore.Http.Features.IFeatureCollection.Revision.get -> int
-Microsoft.AspNetCore.Http.Features.IFeatureCollection.Set<TFeature>(TFeature instance) -> void
+Microsoft.AspNetCore.Http.Features.IFeatureCollection.Set<TFeature>(TFeature? instance) -> void
 Microsoft.AspNetCore.Http.Features.IFeatureCollection.this[System.Type! key].get -> object?
 Microsoft.AspNetCore.Http.Features.IFeatureCollection.this[System.Type! key].set -> void
 Microsoft.AspNetCore.Http.Features.IFormFeature

src/Http/Http/src/Internal/DefaultHttpResponse.cs

@@ -69,7 +69,7 @@ public override Stream Body
             get { return HttpResponseBodyFeature.Stream; }
             set
             {
-                var otherFeature = _features.Collection.Get<IHttpResponseBodyFeature>();
+                var otherFeature = _features.Collection.Get<IHttpResponseBodyFeature>()!;
 
                 if (otherFeature is StreamResponseBodyFeature streamFeature
                     && streamFeature.PriorFeature != null

src/Http/Http/src/Internal/ResponseCookies.cs

@@ -28,7 +28,7 @@ internal class ResponseCookies : IResponseCookies
         internal ResponseCookies(IFeatureCollection features)
         {
             _features = features;
-            Headers = _features.Get<IHttpResponseFeature>().Headers;
+            Headers = _features.Get<IHttpResponseFeature>()!.Headers;
         }
 
         private IHeaderDictionary Headers { get; set; }

src/Middleware/ResponseCompression/src/ResponseCompressionMiddleware.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Diagnostics;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Features;
@@ -54,6 +55,8 @@ public async Task Invoke(HttpContext context)
             var originalBodyFeature = context.Features.Get<IHttpResponseBodyFeature>();
             var originalCompressionFeature = context.Features.Get<IHttpsCompressionFeature>();
 
+            Debug.Assert(originalBodyFeature != null);
+
             var compressionBody = new ResponseCompressionBody(context, _provider, originalBodyFeature);
             context.Features.Set<IHttpResponseBodyFeature>(compressionBody);
             context.Features.Set<IHttpsCompressionFeature>(compressionBody);

src/Middleware/Rewrite/src/UrlActions/CustomResponseAction.cs

@@ -26,7 +26,7 @@ public override void ApplyAction(RewriteContext context, BackReferenceCollection
 
             if (!string.IsNullOrEmpty(StatusReason))
             {
-                context.HttpContext.Features.Get<IHttpResponseFeature>().ReasonPhrase = StatusReason;
+                context.HttpContext.Features.Get<IHttpResponseFeature>()!.ReasonPhrase = StatusReason;
             }
 
             if (!string.IsNullOrEmpty(StatusDescription))

src/Servers/Kestrel/Core/src/Internal/Http/HttpHeaders.Generated.cs

@@ -12,6 +12,8 @@
 using Microsoft.Net.Http.Headers;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
 
+#nullable enable
+
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http
 {
     internal enum KnownHeaderType
@@ -6712,7 +6714,7 @@ protected override bool CopyToFast(KeyValuePair<string, StringValues>[] array, i
                     array[arrayIndex] = new KeyValuePair<string, StringValues>(HeaderNames.ContentLength, HeaderUtilities.FormatNonNegativeInt64(_contentLength.Value));
                     ++arrayIndex;
                 }
-            ((ICollection<KeyValuePair<string, StringValues>>)MaybeUnknown)?.CopyTo(array, arrayIndex);
+            ((ICollection<KeyValuePair<string, StringValues>>?)MaybeUnknown)?.CopyTo(array, arrayIndex);
 
             return true;
         }
@@ -12724,7 +12726,7 @@ protected override bool CopyToFast(KeyValuePair<string, StringValues>[] array, i
                     array[arrayIndex] = new KeyValuePair<string, StringValues>(HeaderNames.ContentLength, HeaderUtilities.FormatNonNegativeInt64(_contentLength.Value));
                     ++arrayIndex;
                 }
-            ((ICollection<KeyValuePair<string, StringValues>>)MaybeUnknown)?.CopyTo(array, arrayIndex);
+            ((ICollection<KeyValuePair<string, StringValues>>?)MaybeUnknown)?.CopyTo(array, arrayIndex);
 
             return true;
         }
@@ -12816,7 +12818,7 @@ internal unsafe void CopyToFast(ref BufferWriter<PipeWriter> output)
                         {
                             tempBits ^= 0x8000000000000000L;
                             output.Write(HeaderBytes.Slice(640, 18));
-                            output.WriteNumeric((ulong)ContentLength.Value);
+                            output.WriteNumeric((ulong)ContentLength.GetValueOrDefault());
                             if (tempBits == 0)
                             {
                                 return;
@@ -13266,10 +13268,10 @@ private struct HeaderReferences
             public StringValues _AccessControlExposeHeaders;
             public StringValues _AccessControlMaxAge;
 
-            public byte[] _rawConnection;
-            public byte[] _rawDate;
-            public byte[] _rawTransferEncoding;
-            public byte[] _rawServer;
+            public byte[]? _rawConnection;
+            public byte[]? _rawDate;
+            public byte[]? _rawTransferEncoding;
+            public byte[]? _rawServer;
         }
 
         public partial struct Enumerator
@@ -14149,7 +14151,7 @@ protected override bool CopyToFast(KeyValuePair<string, StringValues>[] array, i
                     array[arrayIndex] = new KeyValuePair<string, StringValues>(HeaderNames.ContentLength, HeaderUtilities.FormatNonNegativeInt64(_contentLength.Value));
                     ++arrayIndex;
                 }
-            ((ICollection<KeyValuePair<string, StringValues>>)MaybeUnknown)?.CopyTo(array, arrayIndex);
+            ((ICollection<KeyValuePair<string, StringValues>>?)MaybeUnknown)?.CopyTo(array, arrayIndex);
 
             return true;
         }