there is a subfolder named [foo](foo) but the guest account only has `get` access

meaning you can't list the contents of either that folder or its subfolders such as [foo/bar/](foo/bar/)

**WARNING:** repeatedly trying to access those will ban you for 24 hours due to `--ban-403`

however you can access [specific files](foo/bar/ok.png?k=Fc5LMF6_) if you know the full URL including the `?k=` part which is the password / accesskey of that specific file (autogenerated)

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copyparty config: `-v /srv/cpp-pub/secret/foo:pub/demo/secret/foo:g:rw,ed:c,fk`

explained:
* `-v /srv/cpp-pub/secret/foo` share filesystem path...
* `:pub/demo/secret/foo` ...at this url
* `:g` get-only acccess for everyone
* `:rw,ed` read-write for account `ed`
* `:c,fk` set volflag `fk` (filekey)