Step1: Open the example-zehncloud.com.conf file to edit.

sudo nano /etc/apache2/sites-available/example-zehncloud.com.conf

Step 2: To redirect all the traffic to https://www.example-zehncloud.com add the following code. This redirects not only the HTTP traffic to HTTPS but also the example-zehncloud.com traffic to ww.example-zehncloud.com with HTTPS.

RewriteEngine on
RewriteCond %{HTTP_HOST} .
RewriteCond %{HTTP_HOST} !^www. [NC]
RewriteRule ^ http%{ENV:protossl}://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

The complete configuration file looks like:

ServerName example-zehncloud.com
ServerAlias www.example-zehncloud.com
DocumentRoot /var/www/html/example_zehncloudcom
Redirect permanent / https://www.example-zehncloud.com/


   
        # The ServerName directive sets the request scheme, hostname and port that
        # the server uses to identify itself. This is used when creating
        # redirection URLs. In the context of virtual hosts, the ServerName
        # specifies what hostname must appear in the request's Host: header to
        # match this virtual host. For the default virtual host (this file) this
        # value is not decisive as it is used as a last resort host regardless.
        # However, you must set it for any further virtual host explicitly.
        ServerAdmin webmaster@localhost
        ServerName example-zentech.com
	ServerAlias www.example-zehncloud.com
	DocumentRoot /var/www/html/example_zehncloudcom
        RewriteEngine on
        RewriteCond %{HTTP_HOST} .
        RewriteCond %{HTTP_HOST} !^www. [NC]
        RewriteRule ^ http%{ENV:protossl}://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
        SSLEngine On
        # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
        # error, crit, alert, emerg.
        # It is also possible to configure the loglevel for particular
        # modules, e.g.
        #LogLevel info ssl:warn
        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined
        # For most configuration files from conf-available/, which are
        # enabled or disabled at a global level, it is possible to
        # include a line for only one particular virtual host. For example the
        # following line enables the CGI configuration for this host only
        # after it has been globally disabled with "a2disconf".
        #Include conf-available/serve-cgi-bin.conf
        SSLCertificateFile  
        SSLCertificateKeyFile 
        SSLCACertificateFile 
   
</IfModule >