Others:

The most common for sites not listed is by using mod_rewrite within your .htaccess file.

To force all web traffic to use HTTPS [SSL] you can insert the following lines of code into the .htaccess file in the root folder of your website.  It is important that you insert this above any pre-existing mod_rewrite code - placing it at the top of the file is usually suggested.

RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

Should you wish to only force a specific domain to HTTPS you would use the following code - making sure to replace "example\.com" with your actual domain name.  The back slash "\" before the period is important.

RewriteEngine On 
RewriteCond %{HTTP_HOST} example\.com$ [NC]
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://example.com/$1 [R=301,L]

If you can not see the .htaccess file in the cPanel file manger ensure show hidden files is enabled by clicking the gear (settings) in the upper right and checking the box.

 

If you force SSL using these .htaccess rules and you end up with an "endless redirection", "redirection loop", or similar it is quite likely your script/software is trying to re-direct back to non-ssl which is then being re-directed by .htaccess back to SSL.  In this case you will likely need to configure SSL usage within your script/software directly.