Add clearer exception message to HttpResponseStream ODE (#2305)

src/Kestrel.Core/CoreStrings.resx

@@ -500,4 +500,7 @@ For more information on configuring HTTPS see https://go.microsoft.com/fwlink/?l
   <data name="Http2NotSupported" xml:space="preserve">
     <value>HTTP/2 support is experimental, see https://go.microsoft.com/fwlink/?linkid=866785 to enable it.</value>
   </data>
+  <data name="WritingToResponseBodyAfterResponseCompleted" xml:space="preserve">
+    <value>Cannot write to the response body, the response has completed.</value>
+  </data>
 </root>

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

@@ -158,7 +158,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http
                     }
                     break;
                 case HttpStreamState.Closed:
-                    throw new ObjectDisposedException(nameof(HttpResponseStream));
+                    throw new ObjectDisposedException(nameof(HttpResponseStream), CoreStrings.WritingToResponseBodyAfterResponseCompleted);
                 case HttpStreamState.Aborted:
                     if (cancellationToken.IsCancellationRequested)
                     {

src/Kestrel.Core/Properties/CoreStrings.Designer.cs

@@ -878,6 +878,14 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core
         internal static string FormatWritingToResponseBodyNotSupported(object statusCode)
             => string.Format(CultureInfo.CurrentCulture, GetString("WritingToResponseBodyNotSupported", "statusCode"), statusCode);
 
+        /// <summary>
+        /// Cannot write to the response body, the response has completed.
+        /// </summary>
+        internal static string WritingToResponseBodyAfterResponseCompleted
+        {
+            get => GetString("WritingToResponseBodyAfterResponseCompleted");
+        }
+
         /// <summary>
         /// Connection shutdown abnormally.
         /// </summary>

test/Kestrel.Core.Tests/HttpResponseStreamTests.cs

@@ -99,7 +99,8 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
             var stream = new HttpResponseStream(Mock.Of<IHttpBodyControlFeature>(), Mock.Of<IHttpResponseControl>());
             stream.StartAcceptingWrites();
             stream.StopAcceptingWrites();
-            Assert.Throws<ObjectDisposedException>(() => { stream.WriteAsync(new byte[1], 0, 1); });
+            var ex = Assert.Throws<ObjectDisposedException>(() => { stream.WriteAsync(new byte[1], 0, 1); });
+            Assert.Contains(CoreStrings.WritingToResponseBodyAfterResponseCompleted, ex.Message);
         }
 
         [Fact]