Level 3-DId something wrong or I was wrong?

After I put the string into the URL and pressed Enter, the page told me:
403 Permission Denied
You do not have permission for this request

If I was wrong, I thought I would get a "page not found", isn't it?

After I put the string into the URL and pressed Enter, the page told me:
403 Permission Denied
You do not have permission for this request

If I was wrong, I thought I would get a "page not found", isn't it?

You will get a 403 if you leave out the filename and try and request a directly listing