params.put("Client IP", e.getClientIp());
            params.put("Referer", e.getReferer());
            params.put("Languages", e.getLanguages());
            params.put("Virtual Host", e.getVirtualHost());
            params.put("Roles", e.getRoles() != null ? String.join(" ", e.getRoles()) : StringUtil.EMPTY);
            params.put("User Agent", e.getUserAgent());

   *       into the other buffer (userspace). Note that if the file is very large, a naive
   *       implementation will effectively put the whole file in memory. On many systems with paging
   *       and virtual memory, this is not a problem - because it is mapped read-only, the kernel
   *       can always page it to disk "for free". However, on systems where killing processes

        roleTypeList.add("admin");
        dataMap.put("role", roleTypeList);
        final List<String> virtualHostList = new ArrayList<String>();
        virtualHostList.add("site1");
        dataMap.put("virtual_host", virtualHostList);

        assertEquals(
                "87e7e4a2d5e2e24147ffd8820b70877a4cee15abdd48f7702e8233f0d17d7369f6d861124f106b541e6652a3e7a94cd51a332a2500fd065de6920559458cd3de",

    }

    default void setVirtualHostValue(final String value) {
        setSystemProperty(Constants.VIRTUAL_HOST_VALUE_PROPERTY, value);
        propMap.remove(VIRTUAL_HOST_HEADERS);
    }

    default String getVirtualHostValue() {
        return getSystemProperty(Constants.VIRTUAL_HOST_VALUE_PROPERTY, getVirtualHostHeaders());
    }

    default void setLoginRequired(final boolean value) {

 * second invocation, so implementors have made various choices, including:
 *
 * <ul>
 *   <li>returning the same iterator again
 *   <li>throwing an exception of some kind
 *   <li>or the usual, <i>robust</i> behavior, which all known {@link Collection} implementations
 *       have, of returning a new, independent iterator
 * </ul>
 *

        append(buf, "percent", () -> processProbe.getProcessCpuPercent()).append(',');
        append(buf, "total", () -> processProbe.getProcessCpuTotalTime());
        buf.append("},");
        buf.append("\"virtual_memory\":{");
        append(buf, "total", () -> processProbe.getTotalVirtualMemorySize());
        buf.append('}');
        buf.append("},");
    }

    private void appendOsStats(final StringBuilder buf) {

                        copyOp.excludeNull();
                        copyOp.exclude(Stream.concat(Stream.of(Constants.COMMON_CONVERSION_RULE),
                                Stream.of(Constants.PERMISSIONS, Constants.VIRTUAL_HOSTS)).toArray(n -> new String[n]));
                    });
                    final PermissionHelper permissionHelper = ComponentUtil.getPermissionHelper();

    public static final String LABELS_PERMISSIONS = "{labels.permissions}";

    /** The key of the message: Virtual Hosts */
    public static final String LABELS_virtual_hosts = "{labels.virtual_hosts}";

    /** The key of the message: Virtual Host */
    public static final String LABELS_virtual_host = "{labels.virtual_host}";

    /** The key of the message: Label */

    public static final String DEFAULT_LABEL_VALUE_PROPERTY = "label.value";

    public static final String DEFAULT_SORT_VALUE_PROPERTY = "sort.value";

    public static final String VIRTUAL_HOST_VALUE_PROPERTY = "virtual.host.value";

    public static final String LOGIN_REQUIRED_PROPERTY = "login.required";

    public static final String RESULT_COLLAPSED_PROPERTY = "result.collapsed";

        // content
        // cache
        // digest
        // host
        // site
        // url
        // anchor
        // content_length
        // last_modified
        // id
        // virtual_host
        defaultDataMap.put(fessConfig.getIndexFieldVirtualHost(),
                stream(config.getVirtualHosts()).get(stream -> stream.filter(StringUtil::isNotBlank).collect(Collectors.toList())));