Just add the following snippet to the functions.php file of your WordPress theme and specify the post or page ID desired.
function wps_force_ssl( $ force_ssl, $ post_id = 0, $ url = '' ) { if ( $ post_id == 25 ) { return true } return $ force_ssl; } add_filter('force_ssl' , 'wps_force_ssl', 10, 3);
Thanks to Kevin Chard for this recipe!