If you want any of your web-directory to be accessed only via Secure HTTP (HTTPS) protocol then placing following code in ".htaccess" will make sure that any URL or Web-address will be converted from Http to Https.
IndexIgnore *
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
It will rewrite all URLs with HTTPS instead of HTTP. This may be helpful in case while you want only specific directory to be accessed via Secure HTTP or you want your users to redirect to correct address/protocol when they type in http:// by mistake and port 80 is not accessible.
It is also possible to do same with PHP or any other scripting language we use, but then it depends on the application and approach we choose.
