public void setGroupCacheExpiry(final long groupCacheExpiry) {
        this.groupCacheExpiry = groupCacheExpiry;
    }

    /**
     * Sets the maximum group depth for nested group processing.
     * @param maxGroupDepth The maximum depth for nested groups.
     */
    public void setMaxGroupDepth(final int maxGroupDepth) {
        this.maxGroupDepth = maxGroupDepth;
    }

    @Override

                sb.append("]");
            }
            sb.append("; ");
            target = target.getCause();
            if (target != null) {
                sb.append("nested: ");
            }
        }
        return sb.toString();
    }

    /**
     * Processes a label request.
     * @param request The HTTP request.
     * @param response The HTTP response.