diff --git a/build/common.props b/build/common.props
index c7f5bae299..4954e5032a 100644
--- a/build/common.props
+++ b/build/common.props
@@ -16,8 +16,8 @@
     <PackageReference Include="Internal.AspNetCore.Sdk" Version="$(InternalAspNetCoreSdkVersion)" PrivateAssets="All" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFrameworkIdentifier)'=='.NETFramework' AND '$(OutputType)'=='library'">
-    <PackageReference Include="NETStandard.Library" Version="$(BundledNETStandardPackageVersion)" />
+  <ItemGroup Condition="'$(TargetFrameworkIdentifier)'=='.NETFramework'">
+    <PackageReference Include="NETStandard.Library.NETFramework" Version="$(NETStandardLibraryNETFrameworkVersion)" PrivateAssets="All" />
   </ItemGroup>
 
 </Project>
diff --git a/build/dependencies.props b/build/dependencies.props
index c07fc9e447..67ec9bf6fa 100644
--- a/build/dependencies.props
+++ b/build/dependencies.props
@@ -3,8 +3,9 @@
     <AspNetCoreVersion>2.0.0-*</AspNetCoreVersion>
     <AspNetCoreIntegrationTestingVersion>0.4.0-*</AspNetCoreIntegrationTestingVersion>
     <AspNetCoreModuleVersion>1.0.0-*</AspNetCoreModuleVersion>
+    <CoreFxVersion>4.4.0-*</CoreFxVersion>
     <InternalAspNetCoreSdkVersion>2.1.0-*</InternalAspNetCoreSdkVersion>
-    <NETStandardImplicitPackageVersion>$(BundledNETStandardPackageVersion)</NETStandardImplicitPackageVersion>
+    <NETStandardLibraryNETFrameworkVersion>2.0.0-*</NETStandardLibraryNETFrameworkVersion>
     <TestSdkVersion>15.3.0-*</TestSdkVersion>
     <XunitVersion>2.3.0-beta2-*</XunitVersion>
   </PropertyGroup>
diff --git a/samples/EchoApp/EchoApp.csproj b/samples/EchoApp/EchoApp.csproj
index 0aac572423..6499a0a23f 100644
--- a/samples/EchoApp/EchoApp.csproj
+++ b/samples/EchoApp/EchoApp.csproj
@@ -3,7 +3,7 @@
   <Import Project="..\..\build\dependencies.props" />
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.0</TargetFramework>
+    <TargetFrameworks>netcoreapp2.0;net461</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>
@@ -18,4 +18,8 @@
     <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="$(AspNetCoreVersion)" />
   </ItemGroup>
 
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net461' ">
+    <PackageReference Include="NETStandard.Library.NETFramework" Version="$(NETStandardLibraryNETFrameworkVersion)" />
+  </ItemGroup>
+
 </Project>
diff --git a/src/Microsoft.AspNetCore.WebSockets/Microsoft.AspNetCore.WebSockets.csproj b/src/Microsoft.AspNetCore.WebSockets/Microsoft.AspNetCore.WebSockets.csproj
index fd8de4d0df..2f2730ab86 100644
--- a/src/Microsoft.AspNetCore.WebSockets/Microsoft.AspNetCore.WebSockets.csproj
+++ b/src/Microsoft.AspNetCore.WebSockets/Microsoft.AspNetCore.WebSockets.csproj
@@ -4,7 +4,7 @@
 
   <PropertyGroup>
     <Description>ASP.NET Core web socket middleware for use on top of opaque servers.</Description>
-    <TargetFramework>netcoreapp2.0</TargetFramework>
+    <TargetFramework>netstandard2.0</TargetFramework>
     <NoWarn>$(NoWarn);CS1591</NoWarn>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
@@ -14,6 +14,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.Http.Extensions" Version="$(AspNetCoreVersion)" />
     <PackageReference Include="Microsoft.Extensions.Options" Version="$(AspNetCoreVersion)" />
+    <PackageReference Include="System.Numerics.Vectors" Version="$(CoreFxVersion)" />
   </ItemGroup>
 
 </Project>
diff --git a/test/Microsoft.AspNetCore.WebSockets.Test/BufferStream.cs b/test/Microsoft.AspNetCore.WebSockets.Test/BufferStream.cs
index bba60a658b..1916bf8f4b 100644
--- a/test/Microsoft.AspNetCore.WebSockets.Test/BufferStream.cs
+++ b/test/Microsoft.AspNetCore.WebSockets.Test/BufferStream.cs
@@ -152,6 +152,71 @@ namespace Microsoft.AspNetCore.WebSockets.Test
             }
         }
 
+        public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
+        {
+            // TODO: This option doesn't preserve the state object.
+            // return ReadAsync(buffer, offset, count);
+            return base.BeginRead(buffer, offset, count, callback, state);
+        }
+
+        public override int EndRead(IAsyncResult asyncResult)
+        {
+            // return ((Task<int>)asyncResult).Result;
+            return base.EndRead(asyncResult);
+        }
+
+        public async override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+        {
+            if (_terminated)
+            {
+                return 0;
+            }
+
+            VerifyBuffer(buffer, offset, count, allowEmpty: false);
+            var registration = cancellationToken.Register(Abort);
+            await _readLock.WaitAsync(cancellationToken);
+            try
+            {
+                int totalRead = 0;
+                do
+                {
+                    // Don't drained buffered data on abort.
+                    CheckAborted();
+                    if (_topBuffer.Count <= 0)
+                    {
+                        byte[] topBuffer = null;
+                        while (!_bufferedData.TryDequeue(out topBuffer))
+                        {
+                            if (_disposed)
+                            {
+                                CheckAborted();
+                                // Graceful close
+                                return totalRead;
+                            }
+                            await WaitForDataAsync();
+                        }
+                        _topBuffer = new ArraySegment<byte>(topBuffer);
+                    }
+                    var actualCount = Math.Min(count, _topBuffer.Count);
+                    Buffer.BlockCopy(_topBuffer.Array, _topBuffer.Offset, buffer, offset, actualCount);
+                    _topBuffer = new ArraySegment<byte>(_topBuffer.Array,
+                        _topBuffer.Offset + actualCount,
+                        _topBuffer.Count - actualCount);
+                    totalRead += actualCount;
+                    offset += actualCount;
+                    count -= actualCount;
+                }
+                while (count > 0 && (_topBuffer.Count > 0 || _bufferedData.Count > 0));
+                // Keep reading while there is more data available and we have more space to put it in.
+                return totalRead;
+            }
+            finally
+            {
+                registration.Dispose();
+                _readLock.Release();
+            }
+        }
+
         // Write with count 0 will still trigger OnFirstWrite
         public override void Write(byte[] buffer, int offset, int count)
         {
@@ -166,7 +231,7 @@ namespace Microsoft.AspNetCore.WebSockets.Test
                     return;
                 }
                 // Copies are necessary because we don't know what the caller is going to do with the buffer afterwards.
-                byte[] internalBuffer = new byte[count];
+                var internalBuffer = new byte[count];
                 Buffer.BlockCopy(buffer, offset, internalBuffer, 0, count);
                 _bufferedData.Enqueue(internalBuffer);
 
@@ -178,6 +243,35 @@ namespace Microsoft.AspNetCore.WebSockets.Test
             }
         }
 
+        public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
+        {
+            Write(buffer, offset, count);
+            var tcs = new TaskCompletionSource<object>(state);
+            tcs.TrySetResult(null);
+            var result = tcs.Task;
+            if (callback != null)
+            {
+                callback(result);
+            }
+            return result;
+        }
+
+        public override void EndWrite(IAsyncResult asyncResult) { }
+
+        public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+        {
+            VerifyBuffer(buffer, offset, count, allowEmpty: true);
+            if (cancellationToken.IsCancellationRequested)
+            {
+                var tcs = new TaskCompletionSource<object>();
+                tcs.TrySetCanceled();
+                return tcs.Task;
+            }
+
+            Write(buffer, offset, count);
+            return Task.FromResult<object>(null);
+        }
+
         private static void VerifyBuffer(byte[] buffer, int offset, int count, bool allowEmpty)
         {
             if (offset < 0 || offset > buffer.Length)
diff --git a/test/Microsoft.AspNetCore.WebSockets.Test/DuplexStream.cs b/test/Microsoft.AspNetCore.WebSockets.Test/DuplexStream.cs
index f2421bf4e6..03ae00f900 100644
--- a/test/Microsoft.AspNetCore.WebSockets.Test/DuplexStream.cs
+++ b/test/Microsoft.AspNetCore.WebSockets.Test/DuplexStream.cs
@@ -87,6 +87,31 @@ namespace Microsoft.AspNetCore.WebSockets.Test
             throw new NotSupportedException();
         }
 
+        public override int ReadByte()
+        {
+            return ReadStream.ReadByte();
+        }
+
+        public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
+        {
+            return ReadStream.BeginRead(buffer, offset, count, callback, state);
+        }
+
+        public override int EndRead(IAsyncResult asyncResult)
+        {
+            return ReadStream.EndRead(asyncResult);
+        }
+
+        public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+        {
+            return ReadStream.ReadAsync(buffer, offset, count, cancellationToken);
+        }
+
+        public override Task CopyToAsync(Stream destination, int bufferSize, CancellationToken cancellationToken)
+        {
+            return ReadStream.CopyToAsync(destination, bufferSize, cancellationToken);
+        }
+
 #region Read
 
         public override int Read(byte[] buffer, int offset, int count)
@@ -102,6 +127,30 @@ namespace Microsoft.AspNetCore.WebSockets.Test
         {
             WriteStream.Write(buffer, offset, count);
         }
+        public override void WriteByte(byte value)
+        {
+            WriteStream.WriteByte(value);
+        }
+
+        public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
+        {
+            return WriteStream.BeginWrite(buffer, offset, count, callback, state);
+        }
+
+        public override void EndWrite(IAsyncResult asyncResult)
+        {
+            WriteStream.EndWrite(asyncResult);
+        }
+
+        public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+        {
+            return WriteStream.WriteAsync(buffer, offset, count, cancellationToken);
+        }
+
+        public override Task FlushAsync(CancellationToken cancellationToken)
+        {
+            return WriteStream.FlushAsync(cancellationToken);
+        }
 
         public override void Flush()
         {
diff --git a/test/Microsoft.AspNetCore.WebSockets.Test/Microsoft.AspNetCore.WebSockets.Test.csproj b/test/Microsoft.AspNetCore.WebSockets.Test/Microsoft.AspNetCore.WebSockets.Test.csproj
index e275305fb8..b934260ee2 100644
--- a/test/Microsoft.AspNetCore.WebSockets.Test/Microsoft.AspNetCore.WebSockets.Test.csproj
+++ b/test/Microsoft.AspNetCore.WebSockets.Test/Microsoft.AspNetCore.WebSockets.Test.csproj
@@ -3,13 +3,8 @@
   <Import Project="..\..\build\common.props" />
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.0</TargetFramework>
-
-    <!--
-      Workaround for "Explicit RID still required for .NET Framework test projects" (https://github.com/dotnet/sdk/issues/909).
-      Remove when fixed.
-    -->
-    <OutputType>exe</OutputType>
+    <TargetFrameworks>netcoreapp2.0;net461</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">netcoreapp2.0</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>