Is there anyway to trust https certificate on mobile?

Hi since facebook instant game is released, i would like to test it before buy a https certificate for my server. So i install https module in my nodejs server.

On web browser it would fine because i can open the https link, press trust certificate and i can request https link.

But on mobile if i open https url in chrome and trust ceritificate, it wouldnt register for the app i build, so in my app i cant request https link ( my https link which is not buy a ssl certificate).

Is there anyway to do that? I tried create a webview in my app open the https link but it does nothing.