Multiple ports listening in laravel

I'm doing live chat server on my laravel development, I setup everything in Digital Ocean. Setup apache2 and phpmyadmin. However, when I tried to run the

"php artisan serve"(Default port:8000)

then open up my website with IP. The server commands didn't detect anything. Fine. I try my live chat server

"php artisan chat:serve --port=8887"

with different ports. But didn't work for me, it shows blank screen without errors. Suppose shows me live chat messeger interface on my website but blank. I know something deals to my apache2 server, but I have no idea how to deals with it.

By the way, I'm using emberJS chat server and follow-up this tutorial at here