Currently I try to prevent access to a directory on my apache2 web-server via `.htaccess` and basic authentication:

```
AuthType Basic
AuthName "Private"
AuthUserFile ?/.htpasswd
require valid-user

```

Lets say directory path is `/foo/bar`, so `.htacccess` as well as `.htpasswd` are located under `/foo/bar/.htaccess` and `/foo/bar/.htpasswd`.

Absolute addressing from `/foo/bar/.htpasswd` doesn't work. My user account has no permissions to access `/`. 

I already tried to address it relative from within the directory. But apache2 resolves relative addresses from the apache2 root directory, i.e. `/etc/apache2/`.

Actually I only have access to edit content within `/foo/bar`. I have no control over apache2, too.

Question: How to address the `.htpasswd` file for `AuthUserFile` under given limitations?