diff --git a/src/System.Buffers.Experimental/System.Buffers.Experimental.csproj b/src/System.Buffers.Experimental/System.Buffers.Experimental.csproj
index d8a1f4f4250..ff5d1746033 100644
--- a/src/System.Buffers.Experimental/System.Buffers.Experimental.csproj
+++ b/src/System.Buffers.Experimental/System.Buffers.Experimental.csproj
@@ -8,6 +8,7 @@
   </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="..\System.Collections.Sequences\System.Collections.Sequences.csproj" />
+    <ProjectReference Include="..\System.IO.Pipelines\System.IO.Pipelines.csproj" />
     <ProjectReference Include="..\System.Text.Primitives\System.Text.Primitives.csproj" />
     <ProjectReference Include="..\System.Text.Utf8String\System.Text.Utf8String.csproj" />
   </ItemGroup>
diff --git a/src/System.Buffers.Experimental/System/Buffers/BufferExtensions.cs b/src/System.Buffers.Experimental/System/Buffers/BufferExtensions.cs
index 5cbdd8456b1..347ca73063a 100644
--- a/src/System.Buffers.Experimental/System/Buffers/BufferExtensions.cs
+++ b/src/System.Buffers.Experimental/System/Buffers/BufferExtensions.cs
@@ -9,7 +9,6 @@
 
 namespace System.Buffers
 {
-
     public static class MemoryListExtensions
     {
         // span creation helpers:
diff --git a/src/System.Buffers.Experimental/System/Buffers/IPipeWritable.cs b/src/System.Buffers.Experimental/System/Buffers/IPipeWritable.cs
new file mode 100644
index 00000000000..79f52ef6fb8
--- /dev/null
+++ b/src/System.Buffers.Experimental/System/Buffers/IPipeWritable.cs
@@ -0,0 +1,13 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Threading.Tasks;
+
+namespace System.IO.Pipelines
+{
+    public interface IPipeWritable
+    {
+        Task WriteAsync(PipeWriter writer);
+    }
+}
diff --git a/src/System.Text.Http.Parser/HttpParser.cs b/src/System.Text.Http.Parser/HttpParser.cs
index cc1d37872c0..a001cf13636 100644
--- a/src/System.Text.Http.Parser/HttpParser.cs
+++ b/src/System.Text.Http.Parser/HttpParser.cs
@@ -78,7 +78,6 @@ public unsafe bool ParseRequestLine<T>(T handler, in ReadOnlyBuffer<byte> buffer
             return true;
         }
 
-
         public unsafe bool ParseRequestLine<T>(ref T handler, in ReadOnlyBuffer<byte> buffer, out int consumed) where T : IHttpRequestLineHandler
         {
             // Prepare the first span
@@ -493,7 +492,7 @@ public bool ParseResponseLine<T>(ref T handler, ref ReadOnlyBuffer<byte> buffer,
                 throw new Exception("no status code");
             }
 
-            handler.OnStartLine(Parser.Http.Version.Http11, code, codeSlice.Slice(consumedBytes + 1));
+            handler.OnStatusLine(Http.Version.Http11, code, codeSlice.Slice(consumedBytes + 1));
             consumedBytes = eol + s_Eol.Length;
             return true;
         }
diff --git a/src/System.Text.Http.Parser/IHttpResponseLineHandler.cs b/src/System.Text.Http.Parser/IHttpResponseLineHandler.cs
index 6c3cf050ec5..a19f67fad53 100644
--- a/src/System.Text.Http.Parser/IHttpResponseLineHandler.cs
+++ b/src/System.Text.Http.Parser/IHttpResponseLineHandler.cs
@@ -5,6 +5,6 @@ namespace System.Text.Http.Parser
 {
     public interface IHttpResponseLineHandler
     {
-        void OnStartLine(Http.Version version, ushort code, ReadOnlySpan<byte> status);
+        void OnStatusLine(Http.Version version, ushort status, ReadOnlySpan<byte> reason);
     }
 }
diff --git a/src/System.Text.Http/System/Text/Http/BufferWriterHttpExtensions.cs b/src/System.Text.Http/System/Text/Http/BufferWriterHttpExtensions.cs
index 7bc3539fa59..303516a37b5 100644
--- a/src/System.Text.Http/System/Text/Http/BufferWriterHttpExtensions.cs
+++ b/src/System.Text.Http/System/Text/Http/BufferWriterHttpExtensions.cs
@@ -20,13 +20,21 @@ public static BufferWriter AsHttpWriter(this Span<byte> buffer)
             return writer;
         }
 
-        public static void WriteRequestLine(ref this BufferWriter writer, Parser.Http.Method verb, string path)
+        public static void WriteRequestLine(ref this BufferWriter writer, Parser.Http.Method verb, Parser.Http.Version version, string path)
         {
             writer.WriteBytes(verb.AsBytes());
             writer.Write(" /");
 
             writer.Write(path);
-            writer.WriteLine(" HTTP/1.1");
+            if (version == Parser.Http.Version.Http11)
+            {
+                writer.WriteLine(" HTTP/1.1");
+            }
+            else if (version == Parser.Http.Version.Http10)
+            {
+                writer.WriteLine(" HTTP/1.0");
+            }
+            else throw new NotSupportedException("version not supported");
         }
 
         public static void WriteHeader(ref this BufferWriter writer, string headerName, string headerValue)