public function prepend($key, $value, $exp = 0, $onResponse = null)
    {
        $this->getConnectionByKey($key, function ($conn) use ($key, $value, $exp, $onResponse) {
            if (!$conn->connected) {
                return;
            }
            if ($onResponse !== null) {
                $conn->onResponse->push($onResponse);
                $conn->setFree(false);
            }
            $conn->writeln('prepend ' . $this->config->prefix->value . $key . ' 0 ' . $exp . ' ' . mb_orig_strlen($value)
                . ($onResponse === null ? ' noreply' : '') . "\r\n" . $value);
        });
    }