How do I open a websocket coection to cloud from location behind corporate proxy

I have a nodejs websocket server ruing in the cloud to which I can make a secured web socket coection from any location outside of corporate firewall. Now, how can I provide proxy information while creating a websocket coection from a resource behind corporate proxy (on-premise)? I am using this nodejs module from https://github.com/websockets/ws.

I get EHOSTUNREACH error when I execute following code. Please note there is no vpn coection between cloud resource and the on premise resource.

**var wss = new WebSocket('wss://cloudserver:443', {
        rejectUnauthorized: false
    });**

With a sample code like below, I am able to make http coection to cloud from a resource behind corporate proxy using proxy information , but can't figure out how to make it work with the web sockets.

    **var Http = require('http');

    var req = Http.request({
        host: 'proxy',
        port: 8080,
        method: 'GET',
        path: 'http://c.com/' // full URL as path
    }, function (res) {
        res.on('data', function (data) {
            console.log(data.toString());
        });
    });

    req.end()

**

I also looked at following http://blog.vanamco.com/proxy-requests-in-node-js/ and it seems to have what I need, but as I am new to nodejs I am somewhat lost here.