Thrown error in Mongo callback not caught by domain

gistfile1.js

var http = require('http')
  , domain = require('domain')
  , mongo = require('mongodb')
  , config = {
      username: null
    , dbname: null
    , prefix: null
    , password: null
    , host: 'localhost'
    , port: 27017
    }
  , server = new mongo.Server(config.host, config.port)
  , client = new mongo.MongoClient(server, config)
  , _getConnectionUrl;

_getConnectionUrl = function (config) {
  var connectionString = 'mongodb://';
  if (config.username) {
    connectionString += config.username;
    if (config.password) {
      connectionString += ':' + config.password;
    }
    connectionString += '@';
  }
  connectionString += config.host;
  if (config.port) {
    connectionString += ':' + config.port;
  }
  if (config.dbname) {
    connectionString += '/' + config.dbname;
  }
  return connectionString;
};


client.connect(_getConnectionUrl(config), function (err, db) {
  var collection;
  if (err) {
    console.log('Could not connect to Mongo.', err);
  }
  else {
    console.log('Connected to Mongo.');

    http.createServer(function (req, res) {
      var dmn = domain.create();

      dmn.on('error', function (err) {
        console.log('Domain caught error');
        res.writeHead(200, {'Content-Type': 'text/plain'});
        res.end(err.message + '\n');
      });

      dmn.run(function () {
        setTimeout(function () {
          // Domain correctly catches this
          throw new Error('HELP COMPUTER');
        }, 0);

        /*
        collection = db.collection('foos');
        // This call correctly returns no error, no data
        collection.findOne({id: 'asdf'}, function (err, data) {
          console.log('Mongo returned:', arguments);
          // Domain does not catch this
          throw new Error();
        });
        */

      });

    }).listen(1337, '127.0.0.1');
  }
});