defer func() {
		if valid {
			return
		}

		errResp := objectAttributesErrorResponse{
			ArgumentName:  &argumentName,
			ArgumentValue: &argumentValue,
			APIErrorResponse: getAPIErrorResponse(
				ctx,
				apiErr,
				r.URL.Path,
				w.Header().Get(xhttp.AmzRequestID),
				w.Header().Get(xhttp.AmzRequestHostID),
			),
		}

		bugLogIf(ctx, fmt.Errorf("invalid WriteHeader code %v from %v", err.HTTPStatusCode, err.Code))
		err.HTTPStatusCode = http.StatusInternalServerError
	}

	// Generate error response.
	errorResponse := getAPIErrorResponse(ctx, err, reqURL.Path,
		w.Header().Get(xhttp.AmzRequestID), w.Header().Get(xhttp.AmzRequestHostID))
	encodedErrorResponse := encodeResponse(errorResponse)
	writeResponse(w, err.HTTPStatusCode, encodedErrorResponse, mimeXML)