func errorResponseHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method == http.MethodOptions {
		return
	}
	desc := "Do not upgrade one server at a time - please follow the recommended guidelines mentioned here https://github.com/minio/minio#upgrading-minio for your environment"
	switch {
	case strings.HasPrefix(r.URL.Path, peerRESTPrefix):
		writeErrorResponseString(r.Context(), w, APIError{