// for x-amz-write-offset HEADER specified.
		if _, ok := r.Header[xhttp.AmzWriteOffsetBytes]; ok {
			tc, ok := r.Context().Value(mcontext.ContextTraceKey).(*mcontext.TraceCtxt)
			if ok {
				tc.FuncName = "s3.AppendObject"
				tc.ResponseRecorder.LogErrBody = true
			}

			writeErrorResponse(r.Context(), w, getAPIError(ErrNotImplemented), r.URL)
			return
		}

		router.Methods(http.MethodPut).Path("/{object:.+}").
			HeadersRegexp(xhttp.AmzSnowballExtract, "true").
			HandlerFunc(s3APIMiddleware(api.PutObjectExtractHandler, traceHdrsS3HFlag))

		// AppendObject to be rejected
		router.Methods(http.MethodPut).Path("/{object:.+}").
			HeadersRegexp(xhttp.AmzWriteOffsetBytes, "").
			HandlerFunc(s3APIMiddleware(errorResponseHandler))

		// PutObject