Middleware example. ExpressJS.

index.js

app.use(getHost, sessionset);

sessionset({
	secret: 'sysetup-x',
	resave: false,
	saveUninitialized: false,
	name: 'session-x',
	cookie: {
		domain: host  //var host; //Store hostname get with getHost function.
	}
})

/**
 * Middleware function to get local domain.
 */
var getHost = function (req, res, next) {
	host = req.get('host');
	next();
};