Aerys\Server::start PHP 메소드

    public function start() : Promise
    {
        try {
            if ($this->state == self::STOPPED) {
                if ($this->vhosts->count() === 0) {
                    return new Failure(new \LogicException("Cannot start: no virtual hosts registered in composed VhostContainer"));
                }
                return resolve($this->doStart());
            } else {
                return new Failure(new \LogicException("Cannot start server: already " . self::STATES[$this->state]));
            }
        } catch (\Throwable $uncaught) {
            return new Failure($uncaught);
        }
    }