ExpressJS: set/delete cookies

app.js

// Dependencies.
var express = require('express')
      app = module.exports = express.createServer(),
      del = function(req, res) { res.clearCookie('login_token'); res.redirect('/'); },
      set = function(req, res) { res.cookie('login_token', +new Date(), { maxAge: 3600000, path: '/' }); res.redirect('/'); };

// Config
app.configure(function() {
  app.use(express.bodyParser());
  app.use(express.cookieParser());
  app.use(app.router);
});

// Routes
app.get('/', function home(req, res) {
  res.end('<a href="/set">set</a> <a href="/del/a">del</a> <a href="/del">rlydel</a>');
  console.log(req.cookies);
});
app.get('/set', set);
app.get('/del/a', del);
app.get('/del', del);

// Server
app.listen(3000);

In my project am Sign In through Google+ like this

When we click on goolge+ icon it asking emailId and password of gmail like this

after we click sign in it will ask allow access to our project. then it will signin Successfully to our project. like this

when we signout and again click on google+ sign in icon it directly logged in to our project without asking email Id and password. am tried lot of things like clearCookies, session.destroy like etc... but it doesn't asking the form i.,e email Id and password of gmail.

After when we click the clear cookie addon on firefox, like this

it will ask the form for login access like this

please help me.
am using passport and expressjs 4.0 on server.

in nodejs module request or express have function curl_setopt($ch, CURLOPT_COOKIESESSION, TRUE); code PHP

How to clear all cookies programmatically? Not only those you explicitly set yourself in your app with `res.cookie(...), but also those ones that third-party services set themselves, like FB during login with FB. Is it possible at all? This is for the sake of testing, to clear all cookies, that is reset the state in order to start a test again.