How to enable websocket ?

hi, I'm using Cloudlinux 6.6 + WHM 11.48.4 (build 4) + CageFS + php selector +CSF + MriaDB I'm trying to let my clients use websockets in a safe and optimized way. I don't know how to even do this without messing up the security or functionality of other things that are installed and optimized. is there any guide to help me to do that? is here any one help me through this step by step ?