superagent not returning a body when status code is 500. running node v0.10.17.

test.js

var http    = require('http')
var assert  = require('assert')
var agent   = require('superagent')

http.createServer(function (req, res) {
  res.writeHead(500, {'Content-Type': 'text/plain'})
  res.end('Hello World\n')
}).listen(1337, '127.0.0.1', function(){
  agent.get('http://127.0.0.1:1337/').end(function(err, response){
    assert.equal(response.status, 500)
    assert.equal(response.body, 'Hello World\n')
  })
})