Change FlyingPress .htaccess rules
FlyingPress injects some rules to .htaccess to serve cached pages directly by the web server. You can change the rules by using the " flying_press_htaccess_rules" filter.
The wrong htaccess rule may result in a server error and crash your entire site, be careful.
add_filter('flying_press_htaccess_rules', function($flying_press_rules){ // Change $flying_press_rules here return $flying_press_rules; });