nonNull(request, "request");
        Path path = request.getPath();
        URL url = request.getURL();
        Reader reader = request.getReader();
        InputStream inputStream = request.getInputStream();
        if (path == null && url == null && reader == null && inputStream == null) {

    /**
     * Return the comment header.
     *
     * @return the comment header
     */
    public List<String> getHeader() {
        return header;
    }

    /**
     * Set the comment header.
     *
     * @param header the header to use
     */
    public void setHeader(List<String> header) {
        this.header = header;
    }

    /**
     * Return the comment footer.
     *

        }
        final SearchHelper searchHelper = ComponentUtil.getSearchHelper();
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        if (!fessConfig.isAcceptedSearchReferer(request.getHeader("referer"))) {
            writeJsonResponse(HttpServletResponse.SC_BAD_REQUEST, escapeJsonKeyValue(MESSAGE_FIELD, "Referer is invalid."));
            return;
        }

        if (!fessConfig.isApiSearchScroll()) {

                    logger.debug("principal: {}", principal);
                }
            } catch (final Exception e) {
                final String msg = "Failed to process Authorization Header: " + request.getHeader(Constants.AUTHZ_HEADER);
                if (logger.isDebugEnabled()) {
                    logger.debug(msg);
                }
                throw new SsoLoginException(e.getMessage() + " " + msg, e);
            }

        workspaceReaders.add(reactorReader);
        // 2) Repository system session-scoped workspace reader (contains ide and exec request reader)
        for (WorkspaceReader repoWorkspaceReader : chainedWorkspaceReader.getReaders()) {
            if (repoWorkspaceReader != null && repoWorkspaceReader != reactorReader) {
                workspaceReaders.add(repoWorkspaceReader);
            }
        }

                return;
            }
        }
        response.contentType(mimeType);
    }

    public String getClientIp(final HttpServletRequest request) {
        final String value = request.getHeader("x-forwarded-for");
        if (StringUtil.isNotBlank(value)) {
            return value;
        }
        return request.getRemoteAddr();
    }