public static UserInfo visitor() {
        try {
            final UserInfo userInfo = LOCAL_VISITOR.get();
            if (Objects.isNull(userInfo)) {
                // try get from auth
                setLocalVisitorFromAuth();
            }
            return LOCAL_VISITOR.get();
        } catch (Exception e) {
            LOG.warn("get user info error ,not found, used default user ,it unknown");
        }
        return defaultUser();
    }
visitor is login user[admin or other] / app /bootstrap.

@return default is unknown
shenyu-admin/src/main/java/org/apache/shenyu/admin/utils/SessionUtil.java