public RunAppFunc(AppFunc next, RunAppFuncOptions options)
        {
            if (next == null)
                throw new ArgumentNullException(nameof(next));

            if (options == null)
                throw new ArgumentNullException(nameof(options));

            _next = next;
            _options = options;
        }
        public RunAppFunc(AppFunc next, RunAppFuncOptions options)
        {
            if (next == null)
            {
                throw new ArgumentNullException(nameof(next));
            }

            if (options == null)
            {
                throw new ArgumentNullException(nameof(options));
            }

            _next    = next;
            _options = options;
        }