Tips for searching the admin background

Purester blog

When we know the background directory of a website but cannot determine the background login file, we can try to add "."
For example, http://www.xxx.com/admin. after we open directory Listing Denied, the default homepage of this directory is not found,
Then we can change the address to www.xxx.com./admin. Note that there is a "." After com, so that we can directly jump to the login page.
In T00LS, it seems that this can only happen under IIS. I tried several sites and found that not all sites set up by IIS support this method.
For example, if you open http://www.hacksb.cn/admin, the directory Listing Denied is displayed. However, when "." is added, the Bad Request (Invalid Hostname) is displayed. That is, the domain name is not bound to the host.
Although it cannot be killed, it is a good technique. If you encounter such a situation, you can try this method.
I don't know how it works. If you know something about it, I hope you can give it to me.