static function http(int $code, ?string $msg = null) {
        Http::header('HTTP', $code);
        return $msg;
    }
static function http(int $code, ?string $msg = null) {
        Http::header('HTTP', $code);
        return $msg;
    }
置HTTP状态码

@param int $code
@param string|null $msg
@return string|null