} else {
            enc = encoding;
        }
        buf.append(enc);
        final HttpServletResponse response = LaResponseUtil.getResponse();
        response.setContentType(buf.toString());
        writeHeaders(response);
        try (PrintWriter out = new PrintWriter(new OutputStreamWriter(response.getOutputStream(), enc))) {
            out.print(text);

     * @throws IOException if an I/O error occurs
     */
    protected void sendApiResponse(final HttpServletResponse response) throws IOException {
        response.setStatus(429);
        response.setContentType("application/json;charset=UTF-8");
        response.setHeader("Retry-After", String.valueOf(RETRY_AFTER_SECONDS));
        response.getWriter()

                    createErrorResponse("Message is too long (max " + maxMessageLength + " characters)"));
            return;
        }

        // Set SSE headers
        response.setContentType("text/event-stream");
        response.setCharacterEncoding("UTF-8");
        response.setHeader("Cache-Control", "no-cache");
        response.setHeader("Connection", "keep-alive");

        request.setAttribute(Constants.SEARCH_LOG_ACCESS_TYPE, Constants.SEARCH_LOG_ACCESS_TYPE_JSON);
        final JsonRequestParams params = new JsonRequestParams(request, fessConfig);
        try {
            response.setContentType("application/x-ndjson; charset=UTF-8");
            final long count = searchHelper.scrollSearch(params, doc -> {
                buf.setLength(0);
                buf.append('{');
                boolean first2 = true;