connect/express favicon & session problem?

favicon-test.js

var express = require('express')
  , app = express.createServer()
  
app.use(express.cookieParser())
app.use(express.session({ secret: 'foo' }))
app.use(function(req, res, next) {
  console.log(req.url, typeof req.session)
  next()
})

app.listen(80)

output

$ node favicon-test.js
/ object
/favicon.ico undefined