====== Apache2 Basic Authentication ======
===== Quelle =====
  * https://httpd.apache.org/docs/current/howto/auth.html

===== Setup =====
1. Create user & password hash file with bcrypt encryption for passwords.
<code bash>
htpasswd -B -c /etc/apache2/.htpasswd demo-user
New password:
Re-type new password:
Adding password for user demo-user
</code>
2. Add additional user to existing file.
<code bash>
htpasswd -B /etc/apache2/.htpasswd demo-user2
New password:
Re-type new password:
Adding password for user demo-user2
</code>
3. Enable Basic Authentication in Apache2 conf file.
<code apache default.conf>
<Directory /var/www/html/example.org/>
     AuthType Basic
     AuthName "Basic Authentication"
     AuthUserFile /etc/apache2/.htpasswd
     Require valid-user
</Directory>
</code>