Don't set TE header for non-body responses

Resolves #952

Author: benaadams

src/Microsoft.AspNetCore.Server.Kestrel/Internal/Http/Frame.cs

@@ -731,7 +731,7 @@ private void CreateResponseHeader(
             {
                 if (appCompleted)
                 {
-                    // Don't set the Content-Length or Transfer-Encoding headers
+                    // Don't set the Content-Length header
                     // automatically for HEAD requests or 101, 204, 205, 304 responses.
                     if (Method != "HEAD" && StatusCanHaveBody(StatusCode))
                     {
@@ -751,8 +751,13 @@ private void CreateResponseHeader(
                     // request indicates HTTP/1.1 (or later).
                     if (_httpVersion == HttpVersionType.Http11)
                     {
-                        _autoChunk = true;
-                        responseHeaders.SetRawTransferEncoding("chunked", _bytesTransferEncodingChunked);
+                        // Don't set the Transfer-Encoding header
+                        // automatically for HEAD requests or 101, 204, 205, 304 responses.
+                        if (Method != "HEAD" && StatusCanHaveBody(StatusCode))
+                        {
+                            _autoChunk = true;
+                            responseHeaders.SetRawTransferEncoding("chunked", _bytesTransferEncodingChunked);
+                        }
                     }
                     else
                     {