You can’t as Apache2 in prefork mode doesn’t work like this.
I assume you use ModPHP for Aapche2?
Switch over to PHP-FPM and after that to Apache2 + MPM Event And ather that probally a lot of things need to be changed due to configuration differences between modphp and PHP-FPM. I see YouTube-dl running as a process so I assume it is a video website. Make sure you include the video file extensions in the proxy extensions.