CodeIgniter：从所有文件夹中删除index.html是否安全？

I'm new to CodeIgniter. I notice that all CodeIgniter folders (cache, config, controllers, core, errors, etc...) contains an index.html file that basically says "Directory access is forbidden". Correct me if I'm wrong, but I don't think it is possible to get to any of these folders from the web based on CodeIgniter's default configuration.I'm new to CodeIgniter. I notice that all CodeI