ERR_NAME_NOT_RESOLVED getting this error in peerjs involved website

Question

I want to deploy my peerjs server. Deploy PeerJS server on Heroku .I tried this. I deployed it on Heroku

myPeer = new Peer(undefined, {
        host: 'https://host-name-here.com/',
        secure : true,
        port: 443
    })

I used this in client files

Failed to load resource: net::ERR_NAME_NOT_RESOLVED

I am getting this error on deployed site. On the local Site, it's working fine so there is some deployment problem involved.