Create Frame in FrameConnection.

src/Microsoft.AspNetCore.Server.Kestrel.Core/Internal/ConnectionHandler.cs

@@ -33,15 +33,6 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal
             var connectionId = CorrelationIdGenerator.GetNextId();
             var frameConnectionId = Interlocked.Increment(ref _lastFrameConnectionId);
 
-            var frameContext = new FrameContext
-            {
-                ConnectionId = connectionId,
-                ConnectionInformation = connectionInfo,
-                ServiceContext = _serviceContext
-            };
-
-            var frame = new Frame<TContext>(_application, frameContext);
-
             var connection = new FrameConnection(new FrameConnectionContext
             {
                 ConnectionId = connectionId,
@@ -49,7 +40,6 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal
                 ServiceContext = _serviceContext,
                 ConnectionInformation = connectionInfo,
                 ConnectionAdapters = _listenOptions.ConnectionAdapters,
-                Frame = frame,
                 Input = inputPipe,
                 Output = outputPipe,
             });
@@ -57,7 +47,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal
             // Since data cannot be added to the inputPipe by the transport until OnConnection returns,
             // Frame.ProcessRequestsAsync is guaranteed to unblock the transport thread before calling
             // application code.
-            connection.StartRequestProcessing();
+            connection.StartRequestProcessing<TContext>(_application);
 
             return connection;
         }

src/Microsoft.AspNetCore.Server.Kestrel.Core/Internal/FrameConnection.cs

@@ -8,6 +8,7 @@ using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Http.Features;
+using Microsoft.AspNetCore.Hosting.Server;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Adapter.Internal;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
@@ -20,9 +21,9 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal
     public class FrameConnection : IConnectionContext, ITimeoutControl
     {
         private readonly FrameConnectionContext _context;
-        private readonly Frame _frame;
         private List<IAdaptedConnection> _adaptedConnections;
         private readonly TaskCompletionSource<object> _socketClosedTcs = new TaskCompletionSource<object>(TaskCreationOptions.RunContinuationsAsynchronously);
+        private Frame _frame;
 
         private long _lastTimestamp;
         private long _timeoutTimestamp = long.MaxValue;
@@ -33,7 +34,6 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal
         public FrameConnection(FrameConnectionContext context)
         {
             _context = context;
-            _frame = context.Frame;
         }
 
         public string ConnectionId => _context.ConnectionId;
@@ -61,12 +61,12 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal
 
         private IKestrelTrace Log => _context.ServiceContext.Log;
 
-        public void StartRequestProcessing()
+        public void StartRequestProcessing<TContext>(IHttpApplication<TContext> application)
         {
-            _lifetimeTask = ProcessRequestsAsync();
+            _lifetimeTask = ProcessRequestsAsync<TContext>(application);
         }
 
-        private async Task ProcessRequestsAsync()
+        private async Task ProcessRequestsAsync<TContext>(IHttpApplication<TContext> application)
         {
             try
             {
@@ -90,11 +90,19 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal
                     output = adaptedPipeline.Output;
                 }
 
-                // Set these before the first await, this is to make sure that we don't yield control
+                // _frame must be initialized before adding the connection to the connection manager
-                // to the transport until we've added the connection to the connection manager
+                _frame = new Frame<TContext>(application, new FrameContext
-                _frame.TimeoutControl = this;
+                {
-                _frame.Input = input;
+                    ConnectionId = _context.ConnectionId,
-                _frame.Output = new OutputProducer(output, ConnectionId, Log);
+                    ConnectionInformation = _context.ConnectionInformation,
+                    ServiceContext = _context.ServiceContext,
+                    TimeoutControl = this,
+                    Input = input,
+                    Output = output
+                });
+
+                // Do this before the first await so we don't yield control to the transport until we've
+                // added the connection to the connection manager
                 _context.ServiceContext.ConnectionManager.AddConnection(_context.FrameConnectionId, this);
                 _lastTimestamp = _context.ServiceContext.SystemClock.UtcNow.Ticks;
 
@@ -125,6 +133,8 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal
 
         public void OnConnectionClosed(Exception ex)
         {
+            Debug.Assert(_frame != null, $"nameof({_frame}) is null");
+
             // Abort the connection (if not already aborted)
             _frame.Abort(ex);
 
@@ -133,6 +143,8 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal
 
         public Task StopAsync()
         {
+            Debug.Assert(_frame != null, $"nameof({_frame}) is null");
+
             _frame.Stop();
 
             return _lifetimeTask;
@@ -140,12 +152,16 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal
 
         public void Abort(Exception ex)
         {
+            Debug.Assert(_frame != null, $"nameof({_frame}) is null");
+
             // Abort the connection (if not already aborted)
             _frame.Abort(ex);
         }
 
         public Task AbortAsync(Exception ex)
         {
+            Debug.Assert(_frame != null, $"nameof({_frame}) is null");
+
             // Abort the connection (if not already aborted)
             _frame.Abort(ex);
 
@@ -154,11 +170,15 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal
 
         public void Timeout()
         {
+            Debug.Assert(_frame != null, $"nameof({_frame}) is null");
+
             _frame.SetBadRequestState(RequestRejectionReason.RequestTimeout);
         }
 
         private async Task<Stream> ApplyConnectionAdaptersAsync()
         {
+            Debug.Assert(_frame != null, $"nameof({_frame}) is null");
+
             var features = new FeatureCollection();
             var connectionAdapters = _context.ConnectionAdapters;
             var stream = new RawStream(_context.Input.Reader, _context.Output.Writer);
@@ -202,6 +222,8 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal
 
         public void Tick(DateTimeOffset now)
         {
+            Debug.Assert(_frame != null, $"nameof({_frame}) is null");
+
             var timestamp = now.Ticks;
 
             // TODO: Use PlatformApis.VolatileRead equivalent again

src/Microsoft.AspNetCore.Server.Kestrel.Core/Internal/FrameConnectionContext.cs

@@ -16,7 +16,6 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal
         public ServiceContext ServiceContext { get; set; }
         public List<IConnectionAdapter> ConnectionAdapters { get; set; }
         public IConnectionInformation ConnectionInformation { get; set; }
-        public Frame Frame { get; set; }
 
         public IPipe Input { get; set; }
         public IPipe Output { get; set; }

src/Microsoft.AspNetCore.Server.Kestrel.Core/Internal/Http/Frame.cs

@@ -96,15 +96,17 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http
             FrameControl = this;
             _keepAliveTicks = ServerOptions.Limits.KeepAliveTimeout.Ticks;
             _requestHeadersTimeoutTicks = ServerOptions.Limits.RequestHeadersTimeout.Ticks;
+
+            Output = new OutputProducer(frameContext.Output, frameContext.ConnectionId, frameContext.ServiceContext.Log);
         }
 
         public ServiceContext ServiceContext => _frameContext.ServiceContext;
         public IConnectionInformation ConnectionInformation => _frameContext.ConnectionInformation;
 
-        public IPipeReader Input { get; set; }
-        public OutputProducer Output { get; set; }
         public IFeatureCollection ConnectionFeatures { get; set; }
-        public ITimeoutControl TimeoutControl { get; set; }
+        public IPipeReader Input => _frameContext.Input;
+        public OutputProducer Output { get; }
+        public ITimeoutControl TimeoutControl => _frameContext.TimeoutControl;
 
         protected IKestrelTrace Log => ServiceContext.Log;
         private DateHeaderValueManager DateHeaderValueManager => ServiceContext.DateHeaderValueManager;

src/Microsoft.AspNetCore.Server.Kestrel.Core/Internal/Http/FrameContext.cs

@@ -1,6 +1,8 @@
 // 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.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
+using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http
@@ -10,5 +12,8 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http
         public string ConnectionId { get; set; }
         public ServiceContext ServiceContext { get; set; }
         public IConnectionInformation ConnectionInformation { get; set; }
+        public ITimeoutControl TimeoutControl { get; set; }
+        public IPipeReader Input { get; set; }
+        public IPipe Output { get; set; }
     }
 }

test/Microsoft.AspNetCore.Server.Kestrel.Core.Tests/FrameResponseHeadersTests.cs

@@ -6,6 +6,7 @@ using System.Collections.Generic;
 using System.Globalization;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
+using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions;
 using Microsoft.AspNetCore.Testing;
 using Microsoft.Extensions.Primitives;
@@ -22,7 +23,8 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
             var frameContext = new FrameContext
             {
                 ServiceContext = new TestServiceContext(),
-                ConnectionInformation = Mock.Of<IConnectionInformation>()
+                ConnectionInformation = Mock.Of<IConnectionInformation>(),
+                TimeoutControl = null
             };
 
             var frame = new Frame<object>(application: null, frameContext: frameContext);
@@ -61,14 +63,14 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
         [InlineData("Ser\u0080ver", "Data")]
         [InlineData("Server", "Da\u0080ta")]
         [InlineData("Unknown\u0080-Header", "Data")]
-        [InlineData("Ser™ver", "Data")]
+        [InlineData("Ser™ver", "Data")]
-        [InlineData("Server", "Da™ta")]
+        [InlineData("Server", "Da™ta")]
-        [InlineData("Unknown™-Header", "Data")]
+        [InlineData("Unknown™-Header", "Data")]
-        [InlineData("Ser™ver", "Data")]
+        [InlineData("Ser™ver", "Data")]
-        [InlineData("šerver", "Data")]
+        [InlineData("šerver", "Data")]
-        [InlineData("Server", "Dašta")]
+        [InlineData("Server", "Dašta")]
-        [InlineData("Unknownš-Header", "Data")]
+        [InlineData("Unknownš-Header", "Data")]
-        [InlineData("Seršver", "Data")]
+        [InlineData("Seršver", "Data")]
         public void AddingControlOrNonAsciiCharactersToHeadersThrows(string key, string value)
         {
             var responseHeaders = new FrameResponseHeaders();
@@ -259,4 +261,4 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
             "42.000",
         };
     }
-}
+}

test/Microsoft.AspNetCore.Server.Kestrel.Core.Tests/FrameTests.cs

@@ -36,11 +36,12 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
         private readonly PipeFactory _pipelineFactory;
         private ReadCursor _consumed;
         private ReadCursor _examined;
+        private Mock<ITimeoutControl> _timeoutControl;
 
         private class TestFrame<TContext> : Frame<TContext>
         {
             public TestFrame(IHttpApplication<TContext> application, FrameContext context)
-            : base(application, context)
+                : base(application, context)
             {
             }
 
@@ -57,21 +58,17 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
             var output = _pipelineFactory.Create();
 
             _serviceContext = new TestServiceContext();
-
+            _timeoutControl = new Mock<ITimeoutControl>();
             _frameContext = new FrameContext
             {
                 ServiceContext = _serviceContext,
-                ConnectionInformation = Mock.Of<IConnectionInformation>()
+                ConnectionInformation = Mock.Of<IConnectionInformation>(),
-            };
+                TimeoutControl = _timeoutControl.Object,
-
-            _frame = new TestFrame<object>(application: null, context: _frameContext)
-            {
                 Input = _input.Reader,
-                TimeoutControl = Mock.Of<ITimeoutControl>()
+                Output = output
             };
 
-            _frame.Output = new OutputProducer(output, "", Mock.Of<IKestrelTrace>());
+            _frame = new TestFrame<object>(application: null, context: _frameContext);
-
             _frame.Reset();
         }
 
@@ -343,16 +340,13 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
         [Fact]
         public async Task ParseRequestStartsRequestHeadersTimeoutOnFirstByteAvailable()
         {
-            var connectionControl = new Mock<ITimeoutControl>();
-            _frame.TimeoutControl = connectionControl.Object;
-
             await _input.Writer.WriteAsync(Encoding.ASCII.GetBytes("G"));
 
             _frame.ParseRequest((await _input.Reader.ReadAsync()).Buffer, out _consumed, out _examined);
             _input.Reader.Advance(_consumed, _examined);
 
             var expectedRequestHeadersTimeout = _serviceContext.ServerOptions.Limits.RequestHeadersTimeout.Ticks;
-            connectionControl.Verify(cc => cc.ResetTimeout(expectedRequestHeadersTimeout, TimeoutAction.SendTimeoutResponse));
+            _timeoutControl.Verify(cc => cc.ResetTimeout(expectedRequestHeadersTimeout, TimeoutAction.SendTimeoutResponse));
         }
 
         [Fact]
@@ -466,13 +460,10 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
         [Fact]
         public void ProcessRequestsAsyncEnablesKeepAliveTimeout()
         {
-            var connectionControl = new Mock<ITimeoutControl>();
-            _frame.TimeoutControl = connectionControl.Object;
-
             var requestProcessingTask = _frame.ProcessRequestsAsync();
 
             var expectedKeepAliveTimeout = _serviceContext.ServerOptions.Limits.KeepAliveTimeout.Ticks;
-            connectionControl.Verify(cc => cc.SetTimeout(expectedKeepAliveTimeout, TimeoutAction.CloseConnection));
+            _timeoutControl.Verify(cc => cc.SetTimeout(expectedKeepAliveTimeout, TimeoutAction.CloseConnection));
 
             _frame.Stop();
             _input.Writer.Complete();

test/Microsoft.AspNetCore.Server.Kestrel.Core.Tests/OutputProducerTests.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
+using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
 using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 using Microsoft.AspNetCore.Testing;
 using Moq;

test/Microsoft.AspNetCore.Server.Kestrel.Core.Tests/TestInput.cs

@@ -7,10 +7,12 @@ using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
+using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
 using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions;
 using Microsoft.AspNetCore.Testing;
 using Microsoft.Extensions.Internal;
+using Moq;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
 {
@@ -21,15 +23,17 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
 
         public TestInput()
         {
-            var innerContext = new FrameContext { ServiceContext = new TestServiceContext() };
-
-            FrameContext = new Frame<object>(null, innerContext);
-            FrameContext.FrameControl = this;
-
             _memoryPool = new MemoryPool();
             _pipelineFactory = new PipeFactory();
+
             Pipe = _pipelineFactory.Create();
-            FrameContext.Input = Pipe.Reader;
+
+            FrameContext = new Frame<object>(null, new FrameContext
+            {
+                ServiceContext = new TestServiceContext(),
+                Input = Pipe.Reader
+            });
+            FrameContext.FrameControl = this;
         }
 
         public IPipe Pipe { get;  }

test/Microsoft.AspNetCore.Server.Kestrel.Performance/FrameParsingOverheadBenchmark.cs

@@ -6,6 +6,7 @@ using Microsoft.AspNetCore.Server.Kestrel.Core;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
 using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
+using Microsoft.AspNetCore.Server.Kestrel.Performance.Mocks;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Performance
 {
@@ -28,7 +29,8 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Performance
             var frameContext = new FrameContext
             {
                 ServiceContext = serviceContext,
-                ConnectionInformation = new MockConnectionInformation()
+                ConnectionInformation = new MockConnectionInformation(),
+                TimeoutControl = new MockTimeoutControl()
             };
 
             _frame = new Frame<object>(application: null, frameContext: frameContext);

test/Microsoft.AspNetCore.Server.Kestrel.Performance/FrameWritingBenchmark.cs

@@ -9,6 +9,7 @@ using Microsoft.AspNetCore.Server.Kestrel.Core;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
 using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
+using Microsoft.AspNetCore.Server.Kestrel.Performance.Mocks;
 using Microsoft.AspNetCore.Testing;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Performance
@@ -98,18 +99,14 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Performance
                 Log = new MockTrace(),
                 HttpParserFactory = f => new HttpParser<FrameAdapter>()
             };
-            var frameContext = new FrameContext
+
+            var frame = new TestFrame<object>(application: null, context: new FrameContext
             {
                 ServiceContext = serviceContext,
-                ConnectionInformation = new MockConnectionInformation()
+                ConnectionInformation = new MockConnectionInformation(),
-            };
-
-            var frame = new TestFrame<object>(application: null, context: frameContext)
-            {
                 Input = input.Reader,
-            };
+                Output = output
-
+            });
-            frame.Output = new OutputProducer(output, "", null);
 
             frame.Reset();
 

test/Microsoft.AspNetCore.Server.Kestrel.Performance/RequestParsingBenchmark.cs

@@ -30,11 +30,11 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Performance
             var frameContext = new FrameContext
             {
                 ServiceContext = serviceContext,
-                ConnectionInformation = new MockConnectionInformation()
+                ConnectionInformation = new MockConnectionInformation(),
+                TimeoutControl = new MockTimeoutControl()
             };
 
             Frame = new Frame<object>(application: null, frameContext: frameContext);
-            Frame.TimeoutControl = new MockTimeoutControl();
             PipelineFactory = new PipeFactory();
             Pipe = PipelineFactory.Create();
         }

test/Microsoft.AspNetCore.Server.Kestrel.Performance/ResponseHeaderCollectionBenchmark.cs

@@ -32,10 +32,10 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Performance
         }
 
         [Params(
-            BenchmarkTypes.ContentLengthNumeric, 
+            BenchmarkTypes.ContentLengthNumeric,
-            BenchmarkTypes.ContentLengthString, 
+            BenchmarkTypes.ContentLengthString,
-            BenchmarkTypes.Plaintext, 
+            BenchmarkTypes.Plaintext,
-            BenchmarkTypes.Common, 
+            BenchmarkTypes.Common,
             BenchmarkTypes.Unknown
         )]
         public BenchmarkTypes Type { get; set; }

test/Microsoft.AspNetCore.Server.Kestrel.Performance/ResponseHeadersWritingBenchmark.cs

@@ -11,6 +11,7 @@ using Microsoft.AspNetCore.Server.Kestrel.Core;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
 using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
+using Microsoft.AspNetCore.Server.Kestrel.Performance.Mocks;
 using Microsoft.AspNetCore.Testing;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Performance
@@ -121,17 +122,14 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Performance
                 HttpParserFactory = f => new HttpParser<FrameAdapter>()
             };
 
-            var frameContext = new FrameContext
+            var frame = new TestFrame<object>(application: null, context: new FrameContext
             {
                 ServiceContext = serviceContext,
-                ConnectionInformation = new MockConnectionInformation()
+                ConnectionInformation = new MockConnectionInformation(),
-            };
+                TimeoutControl = new MockTimeoutControl(),
-
-            var frame = new TestFrame<object>(application: null, context: frameContext)
-            {
                 Input = input.Reader,
-            };
+                Output = output
-            frame.Output = new OutputProducer(output, "", null);
+            });
 
             frame.Reset();
 

test/Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Tests/LibuvOutputConsumerTests.cs

@@ -693,12 +693,15 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Tests
             };
             var transportContext = new TestLibuvTransportContext { Log = new LibuvTrace(logger) };
 
-            var frame = new Frame<object>(null, new FrameContext { ServiceContext = serviceContext });
-
             var socket = new MockSocket(_mockLibuv, _libuvThread.Loop.ThreadId, transportContext.Log);
-            var outputProducer = new OutputProducer(pipe, "0", serviceContext.Log);
             var consumer = new LibuvOutputConsumer(pipe.Reader, _libuvThread, socket, "0", transportContext.Log);
-            frame.Output = outputProducer;
+
+            var frame = new Frame<object>(null, new FrameContext
+            {
+                ServiceContext = serviceContext,
+                TimeoutControl = Mock.Of<ITimeoutControl>(),
+                Output = pipe
+            });
 
             if (cts != null)
             {
@@ -707,7 +710,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Tests
 
             var ignore = WriteOutputAsync(consumer, pipe.Reader, frame);
 
-            return outputProducer;
+            return frame.Output;
         }
 
         private async Task WriteOutputAsync(LibuvOutputConsumer consumer, IPipeReader outputReader, Frame frame)
@@ -729,4 +732,4 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Tests
             }
         }
     }
-}
+}

test/shared/TestFrame.cs

@@ -4,13 +4,14 @@
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Hosting.Server;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
+using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
 
 namespace Microsoft.AspNetCore.Testing
 {
     public class TestFrame<TContext> : Frame<TContext>
     {
         public TestFrame(IHttpApplication<TContext> application, FrameContext context)
-        : base(application, context)
+            : base(application, context)
         {
         }
 
@@ -31,4 +32,4 @@ namespace Microsoft.AspNetCore.Testing
             return ProduceEnd();
         }
     }
-}
+}