docs: static void processError(String type, String errString, HttpServerExchange exchange) {
          exchange.setStatusCode(StatusCodes.INTERNAL_SERVER_ERROR);
          exchange.getResponseHeaders().add(Headers.CONTENT_TYPE, CONTENT_TYPE);
          exchange.getResponseHeaders().add(new HttpString("Version"), VERSION_PROTOCOL);
          exchange.getResponseHeaders().add(new HttpString("Type"), type);
          exchange.getResponseHeaders().add(new HttpString("Mess"), errString);
          exchange.endExchange();
          UndertowLogger.ROOT_LOGGER.mcmpProcessingError(type, errString);
      }