How do I force SSL using .htaccess

Forcing SSL for your site can be accomplished numerous ways depending on your content but one of the most common 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} ^www\.example\.com [NC]
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$$1 [R=301,L]
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.
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