If you're working with Debian and/or its derivatives, default user for
webserver is www-data, group www-data and the default home directory for
that user is /var/www
Check if this string exists if /etc/passwd
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
BTW, in RedHat, CentOS, Fedora, etc. user is apache, group apache and
the home dir is /usr/share/httpd
Cheers,
Kirill