nodejs websocket and http basic auth

I'd like to implement http basic auth authentication into my nodejs websocket app. Here's my piece of code:

var http = require('http');
var auth = require('http-auth');
var express = require('express');

var app = express();

//....

basic = auth.basic({
    realm: "websocket auth",
    file: __dirname + "/users.htpasswd"
});

var server = http.createServer(basic);
app.listen = function() {
    return server.listen.apply(server, arguments);
};

// WEBSOCKET
var WebSocketServer = require('websocket').server;
var wss = new WebSocketServer({
    httpServer: server
});

wss.on('request', function(request) {
    var connection = request.accept();

    connection.sendUTF('Server: message ws auth');
});

For standard http access authentication it works fine, but I can't get it working on websocket, when I connect through websocket I immediately get response. Is it even possible to authenticate via http on websocket?