excessive memory usage on large incoming http request?

gistfile1.js

var http = require('http')
var PORT = 8080

// watch mem usage
setInterval(function () {
  console.log('memory usage ' + (process.memoryUsage().rss / (1024 * 1024)).toFixed(2) + 'mb')
}, 500)
 
http.createServer(function (req, res) {
  console.log('- got request')
  setTimeout(function () {
    console.log('- didn\'t read')
    req.destroy()
    res.end()
  }, 1000)
}).listen(PORT, function () {
  console.log('server listening on ' + PORT)
})