Ubuntu 16.04
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Use WebDAV
This is the example to configure WebDAV with SSL connection.
[1] For example, Create a directory [webdav] and it makes possible to connect to WebDAV directory only by SSL.
apt-get -y install apache2-utils
mkdir /home/webdav

chown www-data. /home/webdav

chmod 770 /home/webdav

vi /etc/apache2/sites-available/webdav.conf
Alias /webdav /home/webdav
<Location /webdav>
    DAV On
    Options None
    AuthType Basic
    AuthName WebDAV
    AuthUserFile /etc/apache2/.htpasswd
    Require valid-user

a2enmod dav*

Enabling module dav.
Considering dependency dav for dav_fs:
Module dav already enabled
Enabling module dav_fs.
Enabling module dav_lock.
To activate the new configuration, you need to run:
  service apache2 restart
a2ensite webdav

Enabling site webdav.
To activate the new configuration, you need to run:
  service apache2 reload

systemctl restart apache2
# add a user : create a new file with "-c" ( add the "-c" option only for the initial registration )

htpasswd -c /etc/apache2/.htpasswd ubuntu

New password:    
# set password

Re-type new password:
Adding password for user ubuntu
It's the settings for WebDAV client on PC (Windows 10).
[3] Download 'CarotDAV' which is a free WebDAV Client from following site.
⇒ http://www.rei.to/carotdav_en.html
After downloading, Install and start CarotDAV, then the following screen is shown, Click 'File' button and select 'WebDAV'.
[4] Input any name in 'Setting Name' field and input [server name/webdav directory] in 'URI' field and input user name and password like follows.
[5] The configuration is added like follows, click it to connect to the server.
[6] The waring is shown like follows, it says SSL certificates is not installed on your PC, it's no ploblem, Click 'Ignore' and go next.
[7] Just accessed.