if (logger.isDebugEnabled()) {
                logger.debug("Failed to process a scroll request.", e);
            }
            writeJsonResponse(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
        }

    }

    protected void processPingRequest(final HttpServletRequest request, final HttpServletResponse response, final FilterChain chain) {
        if (!acceptHttpMethod(request, GET)) {