Consume corefxlab packages and private build of C# compiler (#1976)

NuGet.config

@@ -5,5 +5,6 @@
     <add key="AspNetCore" value="https://dotnet.myget.org/F/aspnetcore-ci-dev/api/v3/index.json" />
     <add key="AspNetCoreTools" value="https://dotnet.myget.org/F/aspnetcore-tools/api/v3/index.json" />
     <add key="NuGet" value="https://api.nuget.org/v3/index.json" />
+    <add key="roslyn" value="https://dotnet.myget.org/F/roslyn/" />
   </packageSources>
 </configuration>

build/common.props

@@ -11,10 +11,12 @@
     <PublicSign Condition="'$(OS)' != 'Windows_NT'">true</PublicSign>
     <VersionSuffix Condition="'$(VersionSuffix)'!='' AND '$(BuildNumber)' != ''">$(VersionSuffix)-$(BuildNumber)</VersionSuffix>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <LangVersion>7.2</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="Internal.AspNetCore.Sdk" Version="$(InternalAspNetCoreSdkVersion)" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.NETCore.Compilers" Version="$(MicrosoftNETCoreCompilersVersion)" PrivateAssets="All" />
   </ItemGroup>
 
 </Project>

build/dependencies.props

@@ -2,12 +2,14 @@
   <PropertyGroup>
     <AspNetCoreVersion>2.1.0-*</AspNetCoreVersion>
     <CoreFxVersion>4.4.0-*</CoreFxVersion>
+    <CoreFxLabVersion>0.1.0-*</CoreFxLabVersion>
     <InternalAspNetCoreSdkVersion>2.1.1-*</InternalAspNetCoreSdkVersion>
     <LibUvVersion>1.10.0</LibUvVersion>
     <JsonNetVersion>10.0.1</JsonNetVersion>
     <MoqVersion>4.7.49</MoqVersion>
     <NETStandardImplicitPackageVersion>2.0.0-*</NETStandardImplicitPackageVersion>
     <RuntimeFrameworkVersion Condition="'$(TargetFramework)'=='netcoreapp2.0'">2.0.0-*</RuntimeFrameworkVersion>
+    <MicrosoftNETCoreCompilersVersion>2.6.0-rdonly-ref-61915-01</MicrosoftNETCoreCompilersVersion>
     <TestSdkVersion>15.3.0-*</TestSdkVersion>
     <XunitVersion>2.3.0-beta2-*</XunitVersion>
   </PropertyGroup>

samples/LargeResponseApp/LargeResponseApp.csproj

@@ -11,4 +11,8 @@
     <ProjectReference Include="..\..\src\Kestrel\Kestrel.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NETCore.Compilers" Version="$(MicrosoftNETCoreCompilersVersion)" PrivateAssets="All" />
+  </ItemGroup>
+
 </Project>

samples/SampleApp/SampleApp.csproj

@@ -18,6 +18,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="$(AspNetCoreVersion)" />
+    <PackageReference Include="Microsoft.NETCore.Compilers" Version="$(MicrosoftNETCoreCompilersVersion)" PrivateAssets="All" />
   </ItemGroup>
 
 </Project>

src/Kestrel.Core/Adapter/Internal/AdaptedPipeline.cs

@@ -6,7 +6,7 @@ using System.IO;
 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 System.IO.Pipelines;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Adapter.Internal
 {

src/Kestrel.Core/Adapter/Internal/RawStream.cs

@@ -2,10 +2,10 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Adapter.Internal
 {

src/Kestrel.Core/Internal/ConnectionHandler.cs

@@ -1,11 +1,10 @@
 // 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 System.IO.Pipelines;
 using System.Threading;
 using Microsoft.AspNetCore.Hosting.Server;
-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.Internal;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal

src/Kestrel.Core/Internal/FrameConnection.cs

@@ -2,11 +2,10 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Collections;
 using System.Collections.Generic;
 using System.Diagnostics;
-using System.Globalization;
 using System.IO;
+using System.IO.Pipelines;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Hosting.Server;
@@ -14,7 +13,6 @@ using Microsoft.AspNetCore.Http.Features;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Adapter.Internal;
 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.Internal;
 using Microsoft.Extensions.Logging;
 

src/Kestrel.Core/Internal/FrameConnectionContext.cs

@@ -2,8 +2,8 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Collections.Generic;
+using System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Adapter.Internal;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal

src/Kestrel.Core/Internal/Http/ChunkWriter.cs

@@ -2,8 +2,8 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using System.Text;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http
 {

src/Kestrel.Core/Internal/Http/Frame.cs

@@ -5,18 +5,17 @@ using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
+using System.IO.Pipelines;
 using System.Linq;
 using System.Net;
 using System.Runtime.CompilerServices;
 using System.Text;
+using System.Text.Encodings.Web.Utf8;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Features;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.Text.Encodings.Web.Utf8;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Primitives;

src/Kestrel.Core/Internal/Http/FrameAdapter.cs

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

src/Kestrel.Core/Internal/Http/FrameContext.cs

@@ -1,8 +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 System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http

src/Kestrel.Core/Internal/Http/FrameHeaders.Generated.cs

@@ -4,7 +4,7 @@
 using System;
 using System.Collections.Generic;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
+using System.IO.Pipelines;
 using Microsoft.Extensions.Primitives;
 using Microsoft.Net.Http.Headers;
 

src/Kestrel.Core/Internal/Http/FrameRequestHeaders.cs

@@ -6,7 +6,6 @@ using System.Collections;
 using System.Collections.Generic;
 using System.Runtime.CompilerServices;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System;
 using Microsoft.Extensions.Primitives;
 using Microsoft.Net.Http.Headers;
 

src/Kestrel.Core/Internal/Http/FrameResponseHeaders.cs

@@ -2,10 +2,10 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using System.Collections;
 using System.Collections.Generic;
 using System.Runtime.CompilerServices;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 using Microsoft.Extensions.Primitives;
 using Microsoft.Net.Http.Headers;
 

src/Kestrel.Core/Internal/Http/HttpParser.cs

@@ -2,10 +2,9 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using System.Runtime.CompilerServices;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http
 {

src/Kestrel.Core/Internal/Http/IHttpHeadersHandler.cs

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

src/Kestrel.Core/Internal/Http/IHttpParser.cs

@@ -1,7 +1,7 @@
 // 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.Internal.System.IO.Pipelines;
+using System.IO.Pipelines;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http
 {

src/Kestrel.Core/Internal/Http/IHttpRequestLineHandler.cs

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

src/Kestrel.Core/Internal/Http/MessageBody.cs

@@ -3,12 +3,11 @@
 
 using System;
 using System.IO;
+using System.IO.Pipelines;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
-using Microsoft.Extensions.Logging;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http
 {

src/Kestrel.Core/Internal/Http/OutputProducer.cs

@@ -2,10 +2,10 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http
 {

src/Kestrel.Core/Internal/Http/PathNormalizer.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Diagnostics;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http
 {

src/Kestrel.Core/Internal/Http/PipelineExtensions.cs

@@ -2,12 +2,8 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Buffers;
+using System.IO.Pipelines;
 using System.Runtime.CompilerServices;
-using System.Threading.Tasks;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.Buffers;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http
 {

src/Kestrel.Core/Internal/Infrastructure/HttpUtilities.cs

@@ -6,7 +6,6 @@ using System.Diagnostics;
 using System.Runtime.CompilerServices;
 using System.Text;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure
 {

src/Kestrel.Core/Internal/Infrastructure/IThreadPool.cs

@@ -2,8 +2,8 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using System.Threading;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure
 {

src/Kestrel.Core/Internal/RejectionConnection.cs

@@ -2,8 +2,8 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal

src/Kestrel.Core/Kestrel.Core.csproj

@@ -23,6 +23,10 @@
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="$(AspNetCoreVersion)" />
     <PackageReference Include="Microsoft.Extensions.Options" Version="$(AspNetCoreVersion)" />
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="$(CoreFxVersion)" />
+
+    <!-- Override System.Memory and System.Runtime.CompilerServices.Unsafe to the ones we have on feed -->
+    <PackageReference Include="System.Memory" Version="$(CoreFxVersion)" />
+    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="$(CoreFxVersion)" />
   </ItemGroup>
 
   <ItemGroup>

src/Kestrel.Transport.Abstractions/Internal/IConnectionContext.cs

@@ -2,8 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Threading.Tasks;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
+using System.IO.Pipelines;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal
 {

src/Kestrel.Transport.Abstractions/Internal/IConnectionInformation.cs

@@ -1,8 +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 System.IO.Pipelines;
 using System.Net;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal
 {

src/Kestrel.Transport.Abstractions/Kestrel.Transport.Abstractions.csproj

@@ -13,16 +13,18 @@
     <EnableApiCheck>false</EnableApiCheck>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <UseSystemMemory>false</UseSystemMemory>
-    <DefineConstants>$(DefineConstants);KESTREL_BY_SOURCE</DefineConstants>
-    <DefineConstants Condition="'$(UseSystemMemory)' == 'true'">$(DefineConstants);SYSTEM_MEMORY</DefineConstants>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.Internal.CoreFxLab.Sources" Version="$(AspNetCoreVersion)" PrivateAssets="All" />
     <PackageReference Include="Microsoft.AspNetCore.Http.Features" Version="$(AspNetCoreVersion)" />
     <PackageReference Include="System.Numerics.Vectors" Version="$(CoreFxVersion)" />
     <PackageReference Include="System.Buffers" Version="$(CoreFxVersion)" />
-    <PackageReference Condition="'$(UseSystemMemory)' == 'true'" Include="System.Memory" Version="$(CoreFxVersion)" />
+    <PackageReference Include="System.IO.Pipelines" Version="$(CoreFxLabVersion)" />
+    <PackageReference Include="System.Text.Encodings.Web.Utf8" Version="$(CoreFxLabVersion)" />
+
+    <!-- Override System.Memory and System.Runtime.CompilerServices.Unsafe to the ones we have on feed -->
+    <PackageReference Include="System.Memory" Version="$(CoreFxVersion)" />
+    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="$(CoreFxVersion)" />
   </ItemGroup>
 
 </Project>

src/Kestrel.Transport.Libuv/Internal/LibuvConnection.cs

@@ -2,11 +2,11 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Buffers;
 using System.Diagnostics;
 using System.IO;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.Buffers;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
+using System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking;
 using Microsoft.Extensions.Logging;
@@ -109,7 +109,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal
             var currentWritableBuffer = Input.Alloc(MinAllocBufferSize);
             _currentWritableBuffer = currentWritableBuffer;
 
-            _bufferHandle = currentWritableBuffer.Buffer.Pin();
+            _bufferHandle = currentWritableBuffer.Buffer.Retain(true);
 
             return handle.Libuv.buf_init((IntPtr)_bufferHandle.PinnedPointer, currentWritableBuffer.Buffer.Length);
         }
@@ -180,7 +180,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal
 
             // Cleanup state from last OnAlloc. This is safe even if OnAlloc wasn't called.
             _currentWritableBuffer = null;
-            _bufferHandle.Free();
+            _bufferHandle.Dispose();
         }
 
         private async Task ApplyBackpressureAsync(WritableBufferAwaitable flushTask)

src/Kestrel.Transport.Libuv/Internal/LibuvConnectionContext.cs

@@ -1,9 +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 System;
 using System.Net;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
+using System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal

src/Kestrel.Transport.Libuv/Internal/LibuvOutputConsumer.cs

@@ -2,8 +2,8 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal

src/Kestrel.Transport.Libuv/Internal/LibuvThread.cs

@@ -4,11 +4,11 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.IO.Pipelines;
 using System.Runtime.ExceptionServices;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Hosting;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking;
 using Microsoft.Extensions.Logging;
 

src/Kestrel.Transport.Libuv/Internal/Networking/UvWriteReq.cs

@@ -2,10 +2,10 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Buffers;
 using System.Collections.Generic;
 using System.Runtime.InteropServices;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.Buffers;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
+using System.IO.Pipelines;
 using Microsoft.Extensions.Logging;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking
@@ -95,7 +95,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networkin
                 if (nBuffers == 1)
                 {
                     var memory = buffer.First;
-                    var memoryHandle = memory.Pin();
+                    var memoryHandle = memory.Retain(true);
                     _handles.Add(memoryHandle);
 
                     // Fast path for single buffer
@@ -109,7 +109,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networkin
                     foreach (var memory in buffer)
                     {
                         // This won't actually pin the buffer since we're already using pinned memory
-                        var memoryHandle = memory.Pin();
+                        var memoryHandle = memory.Retain(true);
                         _handles.Add(memoryHandle);
 
                         // create and pin each segment being written
@@ -221,7 +221,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networkin
             count = handleList.Count;
             for (var i = 0; i < count; i++)
             {
-                handleList[i].Free();
+                handleList[i].Dispose();
             }
             handleList.Clear();
         }

src/Kestrel.Transport.Sockets/SocketConnection.cs

@@ -8,8 +8,7 @@ using System.IO;
 using System.Net;
 using System.Net.Sockets;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.Buffers;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
+using System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets

src/Kestrel.Transport.Sockets/SocketTransportFactory.cs

@@ -2,7 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
+using System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal;
 using Microsoft.Extensions.Options;
 

test/Kestrel.Core.Tests/AsciiDecoding.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Linq;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System;
 using Xunit;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests

test/Kestrel.Core.Tests/FrameConnectionTests.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.IO.Pipelines;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
@@ -9,7 +10,6 @@ using System.Threading.Tasks;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Adapter.Internal;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 using Microsoft.AspNetCore.Testing;
 using Moq;
 using Xunit;

test/Kestrel.Core.Tests/FrameResponseHeadersTests.cs

@@ -2,16 +2,13 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 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.Internal.System.IO.Pipelines;
-using Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal;
 using Microsoft.AspNetCore.Testing;
 using Microsoft.Extensions.Primitives;
-using Moq;
 using Xunit;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests

test/Kestrel.Core.Tests/FrameTests.cs

@@ -5,6 +5,7 @@ using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.IO;
+using System.IO.Pipelines;
 using System.Linq;
 using System.Text;
 using System.Threading;
@@ -16,7 +17,6 @@ using Microsoft.AspNetCore.Server.Kestrel.Core.Features;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal;
 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 Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Primitives;

test/Kestrel.Core.Tests/HttpParserTests.cs

@@ -2,15 +2,14 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
+using System.IO.Pipelines.Testing;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 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.Internal.System;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines.Testing;
 using Microsoft.AspNetCore.Testing;
 using Microsoft.Extensions.Logging;
 using Moq;

test/Kestrel.Core.Tests/HttpUtilitiesTest.cs

@@ -5,7 +5,6 @@ using System;
 using System.Text;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System;
 using Xunit;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests

test/Kestrel.Core.Tests/KnownStringsTests.cs

@@ -7,7 +7,6 @@ using System.Runtime.CompilerServices;
 using System.Text;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System;
 using Xunit;
 
 namespace Microsoft.AspNetCore.Server.KestrelTests

test/Kestrel.Core.Tests/OutputProducerTests.cs

@@ -2,9 +2,9 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 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;
 using Xunit;

test/Kestrel.Core.Tests/PathNormalizerTests.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Text;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System;
 using Xunit;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests

test/Kestrel.Core.Tests/PipeOptionsTests.cs

@@ -1,9 +1,9 @@
 // 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 System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 using Microsoft.AspNetCore.Testing;
 using Moq;
 using Xunit;

test/Kestrel.Core.Tests/PipelineExtensionTests.cs

@@ -2,11 +2,9 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using System.Text;
-using System.Threading.Tasks;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 using Xunit;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests

test/Kestrel.Core.Tests/StreamsTests.cs

@@ -2,13 +2,10 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Http.Features;
 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;
 using Xunit;
 

test/Kestrel.Core.Tests/TestHelpers/AssertExtensions.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System;
 using Xunit.Sdk;
 
 namespace Xunit

test/Kestrel.Core.Tests/TestInput.cs

@@ -2,10 +2,10 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using System.Text;
 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/Kestrel.FunctionalTests/SystemdActivation/docker.sh

@@ -3,7 +3,8 @@
 set -e
 
 scriptDir=$(dirname "${BASH_SOURCE[0]}")
-~/.dotnet/dotnet publish -f netcoreapp2.0 ./samples/SampleApp/
+PATH="$HOME/.dotnet/:$PATH"
+dotnet publish -f netcoreapp2.0 ./samples/SampleApp/
 cp -R ./samples/SampleApp/bin/Debug/netcoreapp2.0/publish/ $scriptDir
 cp -R ~/.dotnet/ $scriptDir
 
@@ -11,14 +12,14 @@ image=$(docker build -qf $scriptDir/Dockerfile $scriptDir)
 container=$(docker run -Pd $image)
 
 # Try to connect to SampleApp once a second up to 10 times via all available ports.
-for i in {1..10}; do 
+for i in {1..10}; do
     curl -f http://$(docker port $container 8080/tcp) \
     && curl -f http://$(docker port $container 8081/tcp) \
     && curl -fk https://$(docker port $container 8082/tcp) \
     && curl -f http://$(docker port $container 8083/tcp) \
     && curl -f http://$(docker port $container 8084/tcp) \
     && curl -fk https://$(docker port $container 8085/tcp) \
-    && exit 0 || sleep 1; 
+    && exit 0 || sleep 1;
 done
 
 exit -1

test/Kestrel.Performance/FrameFeatureCollection.cs

@@ -2,12 +2,12 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using BenchmarkDotNet.Attributes;
 using Microsoft.AspNetCore.Http.Features;
 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;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Performance
 {

test/Kestrel.Performance/FrameParsingOverheadBenchmark.cs

@@ -1,11 +1,11 @@
 // 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 System.IO.Pipelines;
 using BenchmarkDotNet.Attributes;
 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

test/Kestrel.Performance/FrameWritingBenchmark.cs

@@ -2,13 +2,13 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using System.Threading;
 using System.Threading.Tasks;
 using BenchmarkDotNet.Attributes;
 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.Testing;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Performance

test/Kestrel.Performance/KestrelHttpParserBenchmark.cs

@@ -2,10 +2,9 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using BenchmarkDotNet.Attributes;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Performance
 {

test/Kestrel.Performance/KnownStringsBenchmark.cs

@@ -6,7 +6,6 @@ using System.Text;
 using BenchmarkDotNet.Attributes;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Performance
 {

test/Kestrel.Performance/Mocks/MockConnectionInformation.cs

@@ -1,9 +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 System;
 using System.Net;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
+using System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Performance

test/Kestrel.Performance/Mocks/NullParser.cs

@@ -2,10 +2,9 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using System.Text;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Performance
 {

test/Kestrel.Performance/PipeThroughputBenchmark.cs

@@ -1,9 +1,9 @@
 // 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 System.IO.Pipelines;
 using System.Threading.Tasks;
 using BenchmarkDotNet.Attributes;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Performance
 {

test/Kestrel.Performance/RequestParsingBenchmark.cs

@@ -1,11 +1,11 @@
 // 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 System.IO.Pipelines;
 using BenchmarkDotNet.Attributes;
 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

test/Kestrel.Performance/ResponseHeaderCollectionBenchmark.cs

@@ -1,6 +1,7 @@
 // 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 System.IO.Pipelines;
 using System.Runtime.CompilerServices;
 using System.Text;
 using BenchmarkDotNet.Attributes;
@@ -9,7 +10,6 @@ using Microsoft.AspNetCore.Http.Internal;
 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;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Performance
 {

test/Kestrel.Performance/ResponseHeadersWritingBenchmark.cs

@@ -2,7 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.IO;
+using System.IO.Pipelines;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
@@ -10,7 +10,6 @@ using BenchmarkDotNet.Attributes;
 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;
 

test/Kestrel.Transport.Libuv.Tests/LibuvConnectionTests.cs

@@ -2,9 +2,9 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using System.Threading;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Tests.TestHelpers;

test/Kestrel.Transport.Libuv.Tests/LibuvOutputConsumerTests.cs

@@ -3,12 +3,12 @@
 
 using System;
 using System.Collections.Concurrent;
+using System.IO.Pipelines;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Server.Kestrel.Core;
 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.Libuv.Internal;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Tests.TestHelpers;

test/Kestrel.Transport.Libuv.Tests/MultipleLoopTests.cs

@@ -2,11 +2,11 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.IO.Pipelines;
 using System.Net;
 using System.Net.Sockets;
 using System.Runtime.InteropServices;
 using System.Threading;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Tests.TestHelpers;

test/Kestrel.Transport.Libuv.Tests/NetworkingTests.cs

@@ -8,7 +8,7 @@ using System.Runtime.InteropServices;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Internal.Networking;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
+using System.IO.Pipelines;
 using Microsoft.AspNetCore.Testing;
 using Xunit;
 

test/Kestrel.Transport.Libuv.Tests/TestHelpers/MockConnectionHandler.cs

@@ -2,10 +2,8 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Threading.Tasks;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
+using System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal;
-using Xunit;
 
 namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.Tests.TestHelpers
 {

test/shared/MockConnectionInformation.cs

@@ -1,8 +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 System.IO.Pipelines;
 using System.Net;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal;
 
 namespace Microsoft.AspNetCore.Testing

tools/CodeGenerator/KnownHeaders.cs

@@ -292,7 +292,7 @@ namespace CodeGenerator
 using System;
 using System.Collections.Generic;
 using Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure;
-using Microsoft.AspNetCore.Server.Kestrel.Internal.System.IO.Pipelines;
+using System.IO.Pipelines;
 using Microsoft.Extensions.Primitives;
 using Microsoft.Net.Http.Headers;