diff --git a/src/Microsoft.AspNetCore.Server.IISIntegration/Server/IISHttpContext.ReadWrite.cs b/src/Microsoft.AspNetCore.Server.IISIntegration/Server/IISHttpContext.ReadWrite.cs
index 89266d9e9a..ad1cfdb979 100644
--- a/src/Microsoft.AspNetCore.Server.IISIntegration/Server/IISHttpContext.ReadWrite.cs
+++ b/src/Microsoft.AspNetCore.Server.IISIntegration/Server/IISHttpContext.ReadWrite.cs
@@ -15,25 +15,11 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
         /// <summary>
         /// Reads data from the Input pipe to the user.
         /// </summary>
-        /// <param name="buffer"></param>
-        /// <param name="offset"></param>
-        /// <param name="count"></param>
+        /// <param name="memory"></param>
         /// <param name="cancellationToken"></param>
         /// <returns></returns>
-        public async Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+        internal async Task<int> ReadAsync(Memory<byte> memory, CancellationToken cancellationToken)
         {
-            // Start a task which will continuously call ReadFromIISAsync and WriteToIISAsync
-            if (buffer == null)
-            {
-                throw new ArgumentNullException(nameof(buffer));
-            }
-            if (count == 0)
-            {
-                throw new ArgumentOutOfRangeException(nameof(count));
-            }
-
-            var memory = new Memory<byte>(buffer, offset, count);
-
             StartProcessingRequestAndResponseBody();
 
             while (true)
@@ -44,7 +30,7 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
                 {
                     if (!readableBuffer.IsEmpty)
                     {
-                        var actual = Math.Min(readableBuffer.Length, count);
+                        var actual = Math.Min(readableBuffer.Length, memory.Length);
                         readableBuffer = readableBuffer.Slice(0, actual);
                         readableBuffer.CopyTo(memory.Span);
                         return (int)actual;
@@ -67,7 +53,7 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
         /// <param name="memory"></param>
         /// <param name="cancellationToken"></param>
         /// <returns></returns>
-        public Task WriteAsync(ReadOnlyMemory<byte> memory, CancellationToken cancellationToken = default(CancellationToken))
+        internal Task WriteAsync(ReadOnlyMemory<byte> memory, CancellationToken cancellationToken = default(CancellationToken))
         {
 
             // Want to keep exceptions consistent, 
@@ -88,7 +74,7 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
         /// </summary>
         /// <param name="cancellationToken"></param>
         /// <returns></returns>
-        public Task FlushAsync(CancellationToken cancellationToken = default(CancellationToken))
+        internal Task FlushAsync(CancellationToken cancellationToken = default(CancellationToken))
         {
             if (!_hasResponseStarted)
             {
diff --git a/src/Microsoft.AspNetCore.Server.IISIntegration/Server/IISHttpRequestBody.cs b/src/Microsoft.AspNetCore.Server.IISIntegration/Server/IISHttpRequestBody.cs
index 0a51d9fc7a..be5746c0d3 100644
--- a/src/Microsoft.AspNetCore.Server.IISIntegration/Server/IISHttpRequestBody.cs
+++ b/src/Microsoft.AspNetCore.Server.IISIntegration/Server/IISHttpRequestBody.cs
@@ -39,7 +39,9 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
 
         public override unsafe Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
         {
-            return _httpContext.ReadAsync(buffer, offset, count, cancellationToken);
+            var memory = new Memory<byte>(buffer, offset, count);
+
+            return _httpContext.ReadAsync(memory, cancellationToken);
         }
 
         public override long Seek(long offset, SeekOrigin origin)
diff --git a/src/Microsoft.AspNetCore.Server.IISIntegration/Server/IISHttpResponseBody.cs b/src/Microsoft.AspNetCore.Server.IISIntegration/Server/IISHttpResponseBody.cs
index 38c8e64c2a..f850994a4a 100644
--- a/src/Microsoft.AspNetCore.Server.IISIntegration/Server/IISHttpResponseBody.cs
+++ b/src/Microsoft.AspNetCore.Server.IISIntegration/Server/IISHttpResponseBody.cs
@@ -54,11 +54,6 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
 
         public override unsafe Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
         {
-            if (buffer == null)
-            {
-                throw new ArgumentNullException(nameof(buffer));
-            }
-
             return _httpContext.WriteAsync(new ReadOnlyMemory<byte>(buffer, offset, count), cancellationToken);
         }
 
diff --git a/test/IISIntegration.FunctionalTests/Inprocess/InvalidReadWriteOperationTests.cs b/test/IISIntegration.FunctionalTests/Inprocess/InvalidReadWriteOperationTests.cs
index 524bc2931f..3d8b995e75 100644
--- a/test/IISIntegration.FunctionalTests/Inprocess/InvalidReadWriteOperationTests.cs
+++ b/test/IISIntegration.FunctionalTests/Inprocess/InvalidReadWriteOperationTests.cs
@@ -26,13 +26,11 @@ namespace Microsoft.AspNetCore.Server.IISIntegration.FunctionalTests
         }
 
         [ConditionalTheory]
-        [InlineData("/NullBuffer")]
         [InlineData("/InvalidOffsetSmall")]
         [InlineData("/InvalidOffsetLarge")]
         [InlineData("/InvalidCountSmall")]
         [InlineData("/InvalidCountLarge")]
         [InlineData("/InvalidCountWithOffset")]
-        [InlineData("/InvalidCountZeroRead")]
         public async Task TestInvalidReadOperations(string operation)
         {
             var result = await _fixture.Client.GetStringAsync($"/TestInvalidReadOperations{operation}");
@@ -40,7 +38,6 @@ namespace Microsoft.AspNetCore.Server.IISIntegration.FunctionalTests
         }
 
         [ConditionalTheory]
-        [InlineData("/NullBuffer")]
         [InlineData("/InvalidOffsetSmall")]
         [InlineData("/InvalidOffsetLarge")]
         [InlineData("/InvalidCountSmall")]
diff --git a/test/IISTestSite/Startup.cs b/test/IISTestSite/Startup.cs
index 91f04a7aec..75f94338d6 100644
--- a/test/IISTestSite/Startup.cs
+++ b/test/IISTestSite/Startup.cs
@@ -464,22 +464,7 @@ namespace IISTestSite
             app.Run(async context =>
             {
                 var success = false;
-                if (context.Request.Path.StartsWithSegments("/NullBuffer"))
-                {
-                    try
-                    {
-                        await context.Request.Body.ReadAsync(null, 0, 0);
-                    }
-                    catch (ArgumentNullException)
-                    {
-                        success = true;
-                    }
-                    catch (Exception)
-                    {
-                        success = true;
-                    }
-                }
-                else if (context.Request.Path.StartsWithSegments("/InvalidOffsetSmall"))
+                if (context.Request.Path.StartsWithSegments("/InvalidOffsetSmall"))
                 {
                     try
                     {
@@ -534,21 +519,6 @@ namespace IISTestSite
                         success = true;
                     }
                 }
-                else if (context.Request.Path.StartsWithSegments("/InvalidCountZeroRead"))
-                {
-                    try
-                    {
-                        await context.Request.Body.ReadAsync(new byte[1], 0, 0);
-                    }
-                    catch (ArgumentOutOfRangeException)
-                    {
-                        success = true;
-                    }
-                    catch (Exception)
-                    {
-                        success = true;
-                    }
-                }
 
                 await context.Response.WriteAsync(success ? "Success" : "Failure");
             });
@@ -558,18 +528,7 @@ namespace IISTestSite
             app.Run(async context =>
             {
                 var success = false;
-                if (context.Request.Path.StartsWithSegments("/NullBuffer"))
-                {
-                    try
-                    {
-                        await context.Response.Body.WriteAsync(null, 0, 0);
-                    }
-                    catch (ArgumentNullException)
-                    {
-                        success = true;
-                    }
-                }
-                else if (context.Request.Path.StartsWithSegments("/InvalidOffsetSmall"))
+                 if (context.Request.Path.StartsWithSegments("/InvalidOffsetSmall"))
                 {
                     try
                     {