bugLogIf(context.Background(), fmt.Errorf("invalid WriteHeader code %v", statusCode))
		statusCode = http.StatusInternalServerError
	}
	setCommonHeaders(w)
	if mType != mimeNone {
		w.Header().Set(xhttp.ContentType, string(mType))
	}
	w.Header().Set(xhttp.ContentLength, strconv.Itoa(len(response)))
	w.WriteHeader(statusCode)
	if response != nil {
		w.Write(response)
	}
}