diff --git a/lib/engine.io.js b/lib/engine.io.js
index 2a211c2b2..6fe013880 100644
--- a/lib/engine.io.js
+++ b/lib/engine.io.js
@@ -2,7 +2,8 @@
  * Module dependencies.
  */
 
-var http = require('http');
+const http = require('http');
+const Server = require('./server');
 
 /**
  * Invoking the library as a function delegates to attach if the first argument
@@ -25,7 +26,7 @@ exports = module.exports = function () {
   }
 
   // if first argument is not an http server, then just make a regular eio server
-  return exports.Server.apply(null, arguments);
+  return new Server(arguments);
 };
 
 /**
@@ -42,7 +43,7 @@ exports.protocol = 1;
  * @api public
  */
 
-exports.Server = require('./server');
+exports.Server = Server;
 
 /**
  * Expose Socket constructor.
@@ -94,13 +95,13 @@ function listen (port, options, fn) {
     options = {};
   }
 
-  var server = http.createServer(function (req, res) {
+  const server = http.createServer(function (req, res) {
     res.writeHead(501);
     res.end('Not Implemented');
   });
 
   // create engine server
-  var engine = exports.attach(server, options);
+  const engine = exports.attach(server, options);
   engine.httpServer = server;
 
   server.listen(port, fn);
@@ -120,7 +121,7 @@ function listen (port, options, fn) {
 exports.attach = attach;
 
 function attach (server, options) {
-  var engine = new exports.Server(options);
+  const engine = new Server(options);
   engine.attach(server, options);
   return engine;
 }
diff --git a/lib/server.js b/lib/server.js
index 2d9a45c7a..2922c6323 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -1,239 +1,432 @@
+const qs = require('querystring');
+const parse = require('url').parse;
+const base64id = require('base64id');
+const transports = require('./transports');
+const EventEmitter = require('events').EventEmitter;
+const Socket = require('./socket');
+const debug = require('debug')('engine');
+const cookieMod = require('cookie');
+
+class Server extends EventEmitter {
+  /**
+   * Server constructor.
+   *
+   * @param {Object} options
+   * @api public
+   */
+  constructor (opts) {
+    super();
+
+    this.clients = {};
+    this.clientsCount = 0;
+
+    opts = opts || {};
+
+    this.wsEngine = opts.wsEngine || process.env.EIO_WS_ENGINE || 'ws';
+    this.pingTimeout = opts.pingTimeout || 5000;
+    this.pingInterval = opts.pingInterval || 25000;
+    this.upgradeTimeout = opts.upgradeTimeout || 10000;
+    this.maxHttpBufferSize = opts.maxHttpBufferSize || 10E7;
+    this.transports = opts.transports || Object.keys(transports);
+    this.allowUpgrades = false !== opts.allowUpgrades;
+    this.allowRequest = opts.allowRequest;
+    this.cookie = false !== opts.cookie ? (opts.cookie || 'io') : false;
+    this.cookiePath = false !== opts.cookiePath ? (opts.cookiePath || '/') : false;
+    this.cookieHttpOnly = false !== opts.cookieHttpOnly;
+    this.perMessageDeflate = false !== opts.perMessageDeflate ? (opts.perMessageDeflate || true) : false;
+    this.httpCompression = false !== opts.httpCompression ? (opts.httpCompression || {}) : false;
+    this.initialPacket = opts.initialPacket;
+
+    // initialize compression options
+    ['perMessageDeflate', 'httpCompression'].forEach((type) => {
+      let compression = this[type];
+      if (true === compression) this[type] = compression = {};
+      if (compression && null == compression.threshold) {
+        compression.threshold = 1024;
+      }
+    });
 
-/**
- * Module dependencies.
- */
+    this.init();
+  }
 
-var qs = require('querystring');
-var parse = require('url').parse;
-var base64id = require('base64id');
-var transports = require('./transports');
-var EventEmitter = require('events').EventEmitter;
-var Socket = require('./socket');
-var util = require('util');
-var debug = require('debug')('engine');
-var cookieMod = require('cookie');
+  /**
+   * Initialize websocket server
+   *
+   * @api private
+   */
+  init () {
+    if (!~this.transports.indexOf('websocket')) return;
+
+    if (this.ws) this.ws.close();
+
+    let wsModule;
+    switch (this.wsEngine) {
+      case 'uws': wsModule = require('uws'); break;
+      case 'ws': wsModule = require('ws'); break;
+      default: throw new Error('unknown wsEngine');
+    }
+    this.ws = new wsModule.Server({
+      noServer: true,
+      clientTracking: false,
+      perMessageDeflate: this.perMessageDeflate,
+      maxPayload: this.maxHttpBufferSize
+    });
+  }
 
-/**
- * Module exports.
- */
+  /**
+   * Returns a list of available transports for upgrade given a certain transport.
+   *
+   * @return {Array}
+   * @api public
+   */
+  upgrades (transport) {
+    if (!this.allowUpgrades) return [];
+    return transports[transport].upgradesTo || [];
+  }
 
-module.exports = Server;
+  /**
+   * Verifies a request.
+   *
+   * @param {http.IncomingMessage}
+   * @return {Boolean} whether the request is valid
+   * @api private
+   */
+  verify (req, upgrade, fn) {
+    // transport check
+    const transport = req._query.transport;
+    if (!~this.transports.indexOf(transport)) {
+      debug('unknown transport "%s"', transport);
+      return fn(Server.errors.UNKNOWN_TRANSPORT, false);
+    }
 
-/**
- * Server constructor.
- *
- * @param {Object} options
- * @api public
- */
+    // 'Origin' header check
+    const isOriginInvalid = checkInvalidHeaderChar(req.headers.origin);
+    if (isOriginInvalid) {
+      req.headers.origin = null;
+      debug('origin header invalid');
+      return fn(Server.errors.BAD_REQUEST, false);
+    }
+
+    // sid check
+    const sid = req._query.sid;
+    if (sid) {
+      if (!this.clients.hasOwnProperty(sid)) {
+        debug('unknown sid "%s"', sid);
+        return fn(Server.errors.UNKNOWN_SID, false);
+      }
+      if (!upgrade && this.clients[sid].transport.name !== transport) {
+        debug('bad request: unexpected transport without upgrade');
+        return fn(Server.errors.BAD_REQUEST, false);
+      }
+    } else {
+      // handshake is GET only
+      if ('GET' !== req.method) return fn(Server.errors.BAD_HANDSHAKE_METHOD, false);
+      if (!this.allowRequest) return fn(null, true);
+      return this.allowRequest(req, fn);
+    }
 
-function Server (opts) {
-  if (!(this instanceof Server)) {
-    return new Server(opts);
+    fn(null, true);
   }
 
-  this.clients = {};
-  this.clientsCount = 0;
-
-  opts = opts || {};
-
-  this.wsEngine = opts.wsEngine || process.env.EIO_WS_ENGINE || 'ws';
-  this.pingTimeout = opts.pingTimeout || 5000;
-  this.pingInterval = opts.pingInterval || 25000;
-  this.upgradeTimeout = opts.upgradeTimeout || 10000;
-  this.maxHttpBufferSize = opts.maxHttpBufferSize || 10E7;
-  this.transports = opts.transports || Object.keys(transports);
-  this.allowUpgrades = false !== opts.allowUpgrades;
-  this.allowRequest = opts.allowRequest;
-  this.cookie = false !== opts.cookie ? (opts.cookie || 'io') : false;
-  this.cookiePath = false !== opts.cookiePath ? (opts.cookiePath || '/') : false;
-  this.cookieHttpOnly = false !== opts.cookieHttpOnly;
-  this.perMessageDeflate = false !== opts.perMessageDeflate ? (opts.perMessageDeflate || true) : false;
-  this.httpCompression = false !== opts.httpCompression ? (opts.httpCompression || {}) : false;
-  this.initialPacket = opts.initialPacket;
-
-  var self = this;
-
-  // initialize compression options
-  ['perMessageDeflate', 'httpCompression'].forEach(function (type) {
-    var compression = self[type];
-    if (true === compression) self[type] = compression = {};
-    if (compression && null == compression.threshold) {
-      compression.threshold = 1024;
+  /**
+   * Prepares a request by processing the query string.
+   *
+   * @api private
+   */
+  prepare (req) {
+    // try to leverage pre-existing `req._query` (e.g: from connect)
+    if (!req._query) {
+      req._query = ~req.url.indexOf('?') ? qs.parse(parse(req.url).query) : {};
     }
-  });
+  }
 
-  this.init();
-}
+  /**
+   * Closes all clients.
+   *
+   * @api public
+   */
+  close () {
+    debug('closing all open clients');
+    for (let i in this.clients) {
+      if (this.clients.hasOwnProperty(i)) {
+        this.clients[i].close(true);
+      }
+    }
+    if (this.ws) {
+      debug('closing webSocketServer');
+      this.ws.close();
+      // don't delete this.ws because it can be used again if the http server starts listening again
+    }
+    return this;
+  }
 
-/**
- * Protocol errors mappings.
- */
+  /**
+   * Handles an Engine.IO HTTP request.
+   *
+   * @param {http.IncomingMessage} request
+   * @param {http.ServerResponse|http.OutgoingMessage} response
+   * @api public
+   */
+  handleRequest (req, res) {
+    debug('handling "%s" http request "%s"', req.method, req.url);
+    this.prepare(req);
+    req.res = res;
+
+    const self = this;
+    this.verify(req, false, function (err, success) {
+      if (!success) {
+        sendErrorMessage(req, res, err);
+        return;
+      }
 
-Server.errors = {
-  UNKNOWN_TRANSPORT: 0,
-  UNKNOWN_SID: 1,
-  BAD_HANDSHAKE_METHOD: 2,
-  BAD_REQUEST: 3,
-  FORBIDDEN: 4
-};
+      if (req._query.sid) {
+        debug('setting new request for existing client');
+        self.clients[req._query.sid].transport.onRequest(req);
+      } else {
+        self.handshake(req._query.transport, req);
+      }
+    });
+  }
 
-Server.errorMessages = {
-  0: 'Transport unknown',
-  1: 'Session ID unknown',
-  2: 'Bad handshake method',
-  3: 'Bad request',
-  4: 'Forbidden'
-};
+  /**
+   * generate a socket id.
+   * Overwrite this method to generate your custom socket id
+   *
+   * @param {Object} request object
+   * @api public
+   */
+  generateId (req) {
+    return base64id.generateId();
+  }
 
-/**
- * Inherits from EventEmitter.
- */
+  /**
+   * Handshakes a new client.
+   *
+   * @param {String} transport name
+   * @param {Object} request object
+   * @api private
+   */
+  handshake (transportName, req) {
+    const id = this.generateId(req);
+
+    debug('handshaking client "%s"', id);
+
+    try {
+      var transport = new transports[transportName](req);
+      if ('polling' === transportName) {
+        transport.maxHttpBufferSize = this.maxHttpBufferSize;
+        transport.httpCompression = this.httpCompression;
+      } else if ('websocket' === transportName) {
+        transport.perMessageDeflate = this.perMessageDeflate;
+      }
 
-util.inherits(Server, EventEmitter);
+      if (req._query && req._query.b64) {
+        transport.supportsBinary = false;
+      } else {
+        transport.supportsBinary = true;
+      }
+    } catch (e) {
+      debug('error handshaking to transport "%s"', transportName);
+      sendErrorMessage(req, req.res, Server.errors.BAD_REQUEST);
+      return;
+    }
+    const socket = new Socket(id, this, transport, req);
+    const self = this;
+
+    if (false !== this.cookie) {
+      transport.on('headers', function (headers) {
+        headers['Set-Cookie'] = cookieMod.serialize(self.cookie, id,
+          {
+            path: self.cookiePath,
+            httpOnly: self.cookiePath ? self.cookieHttpOnly : false
+          });
+      });
+    }
 
-/**
- * Initialize websocket server
- *
- * @api private
- */
+    transport.onRequest(req);
 
-Server.prototype.init = function () {
-  if (!~this.transports.indexOf('websocket')) return;
+    this.clients[id] = socket;
+    this.clientsCount++;
 
-  if (this.ws) this.ws.close();
+    socket.once('close', function () {
+      delete self.clients[id];
+      self.clientsCount--;
+    });
 
-  var wsModule;
-  switch (this.wsEngine) {
-    case 'uws': wsModule = require('uws'); break;
-    case 'ws': wsModule = require('ws'); break;
-    default: throw new Error('unknown wsEngine');
+    this.emit('connection', socket);
   }
-  this.ws = new wsModule.Server({
-    noServer: true,
-    clientTracking: false,
-    perMessageDeflate: this.perMessageDeflate,
-    maxPayload: this.maxHttpBufferSize
-  });
-};
 
-/**
- * Returns a list of available transports for upgrade given a certain transport.
- *
- * @return {Array}
- * @api public
- */
-
-Server.prototype.upgrades = function (transport) {
-  if (!this.allowUpgrades) return [];
-  return transports[transport].upgradesTo || [];
-};
+  /**
+   * Handles an Engine.IO HTTP Upgrade.
+   *
+   * @api public
+   */
+  handleUpgrade (req, socket, upgradeHead) {
+    this.prepare(req);
+
+    const self = this;
+    this.verify(req, true, function (err, success) {
+      if (!success) {
+        abortConnection(socket, err);
+        return;
+      }
 
-/**
- * Verifies a request.
- *
- * @param {http.IncomingMessage}
- * @return {Boolean} whether the request is valid
- * @api private
- */
+      const head = Buffer.from(upgradeHead); // eslint-disable-line node/no-deprecated-api
+      upgradeHead = null;
 
-Server.prototype.verify = function (req, upgrade, fn) {
-  // transport check
-  var transport = req._query.transport;
-  if (!~this.transports.indexOf(transport)) {
-    debug('unknown transport "%s"', transport);
-    return fn(Server.errors.UNKNOWN_TRANSPORT, false);
+      // delegate to ws
+      self.ws.handleUpgrade(req, socket, head, function (conn) {
+        self.onWebSocket(req, conn);
+      });
+    });
   }
 
-  // 'Origin' header check
-  var isOriginInvalid = checkInvalidHeaderChar(req.headers.origin);
-  if (isOriginInvalid) {
-    req.headers.origin = null;
-    debug('origin header invalid');
-    return fn(Server.errors.BAD_REQUEST, false);
-  }
+  /**
+   * Called upon a ws.io connection.
+   *
+   * @param {ws.Socket} websocket
+   * @api private
+   */
+  onWebSocket (req, socket) {
+    socket.on('error', onUpgradeError);
+
+    if (transports[req._query.transport] !== undefined && !transports[req._query.transport].prototype.handlesUpgrades) {
+      debug('transport doesnt handle upgraded requests');
+      socket.close();
+      return;
+    }
 
-  // sid check
-  var sid = req._query.sid;
-  if (sid) {
-    if (!this.clients.hasOwnProperty(sid)) {
-      debug('unknown sid "%s"', sid);
-      return fn(Server.errors.UNKNOWN_SID, false);
+    // get client id
+    const id = req._query.sid;
+
+    // keep a reference to the ws.Socket
+    req.websocket = socket;
+
+    if (id) {
+      const client = this.clients[id];
+      if (!client) {
+        debug('upgrade attempt for closed client');
+        socket.close();
+      } else if (client.upgrading) {
+        debug('transport has already been trying to upgrade');
+        socket.close();
+      } else if (client.upgraded) {
+        debug('transport had already been upgraded');
+        socket.close();
+      } else {
+        debug('upgrading existing transport');
+
+        // transport error handling takes over
+        socket.removeListener('error', onUpgradeError);
+
+        const transport = new transports[req._query.transport](req);
+        if (req._query && req._query.b64) {
+          transport.supportsBinary = false;
+        } else {
+          transport.supportsBinary = true;
+        }
+        transport.perMessageDeflate = this.perMessageDeflate;
+        client.maybeUpgrade(transport);
+      }
+    } else {
+      // transport error handling takes over
+      socket.removeListener('error', onUpgradeError);
+
+      this.handshake(req._query.transport, req);
     }
-    if (!upgrade && this.clients[sid].transport.name !== transport) {
-      debug('bad request: unexpected transport without upgrade');
-      return fn(Server.errors.BAD_REQUEST, false);
+
+    function onUpgradeError () {
+      debug('websocket error before upgrade');
+      // socket.close() not needed
     }
-  } else {
-    // handshake is GET only
-    if ('GET' !== req.method) return fn(Server.errors.BAD_HANDSHAKE_METHOD, false);
-    if (!this.allowRequest) return fn(null, true);
-    return this.allowRequest(req, fn);
   }
 
-  fn(null, true);
-};
-
-/**
- * Prepares a request by processing the query string.
- *
- * @api private
- */
+  /**
+   * Captures upgrade requests for a http.Server.
+   *
+   * @param {http.Server} server
+   * @param {Object} options
+   * @api public
+   */
+  attach (server, options) {
+    const self = this;
+    options = options || {};
+    let path = (options.path || '/engine.io').replace(/\/$/, '');
+
+    const destroyUpgradeTimeout = options.destroyUpgradeTimeout || 1000;
+
+    // normalize path
+    path += '/';
+
+    function check (req) {
+      if ('OPTIONS' === req.method && false === options.handlePreflightRequest) {
+        return false;
+      }
+      return path === req.url.substr(0, path.length);
+    }
 
-Server.prototype.prepare = function (req) {
-  // try to leverage pre-existing `req._query` (e.g: from connect)
-  if (!req._query) {
-    req._query = ~req.url.indexOf('?') ? qs.parse(parse(req.url).query) : {};
-  }
-};
+    // cache and clean up listeners
+    const listeners = server.listeners('request').slice(0);
+    server.removeAllListeners('request');
+    server.on('close', self.close.bind(self));
+    server.on('listening', self.init.bind(self));
 
-/**
- * Closes all clients.
- *
- * @api public
- */
+    // add request handler
+    server.on('request', function (req, res) {
+      if (check(req)) {
+        debug('intercepting request for path "%s"', path);
+        if ('OPTIONS' === req.method && 'function' === typeof options.handlePreflightRequest) {
+          options.handlePreflightRequest.call(server, req, res);
+        } else {
+          self.handleRequest(req, res);
+        }
+      } else {
+        let i = 0;
+        const l = listeners.length;
+        for (; i < l; i++) {
+          listeners[i].call(server, req, res);
+        }
+      }
+    });
 
-Server.prototype.close = function () {
-  debug('closing all open clients');
-  for (var i in this.clients) {
-    if (this.clients.hasOwnProperty(i)) {
-      this.clients[i].close(true);
+    if (~self.transports.indexOf('websocket')) {
+      server.on('upgrade', function (req, socket, head) {
+        if (check(req)) {
+          self.handleUpgrade(req, socket, head);
+        } else if (false !== options.destroyUpgrade) {
+          // default node behavior is to disconnect when no handlers
+          // but by adding a handler, we prevent that
+          // and if no eio thing handles the upgrade
+          // then the socket needs to die!
+          setTimeout(function () {
+            if (socket.writable && socket.bytesWritten <= 0) {
+              return socket.end();
+            }
+          }, destroyUpgradeTimeout);
+        }
+      });
     }
   }
-  if (this.ws) {
-    debug('closing webSocketServer');
-    this.ws.close();
-    // don't delete this.ws because it can be used again if the http server starts listening again
-  }
-  return this;
-};
+}
 
 /**
- * Handles an Engine.IO HTTP request.
- *
- * @param {http.IncomingMessage} request
- * @param {http.ServerResponse|http.OutgoingMessage} response
- * @api public
+ * Protocol errors mappings.
  */
 
-Server.prototype.handleRequest = function (req, res) {
-  debug('handling "%s" http request "%s"', req.method, req.url);
-  this.prepare(req);
-  req.res = res;
-
-  var self = this;
-  this.verify(req, false, function (err, success) {
-    if (!success) {
-      sendErrorMessage(req, res, err);
-      return;
-    }
+Server.errors = {
+  UNKNOWN_TRANSPORT: 0,
+  UNKNOWN_SID: 1,
+  BAD_HANDSHAKE_METHOD: 2,
+  BAD_REQUEST: 3,
+  FORBIDDEN: 4
+};
 
-    if (req._query.sid) {
-      debug('setting new request for existing client');
-      self.clients[req._query.sid].transport.onRequest(req);
-    } else {
-      self.handshake(req._query.transport, req);
-    }
-  });
+Server.errorMessages = {
+  0: 'Transport unknown',
+  1: 'Session ID unknown',
+  2: 'Bad handshake method',
+  3: 'Bad request',
+  4: 'Forbidden'
 };
 
 /**
@@ -245,9 +438,9 @@ Server.prototype.handleRequest = function (req, res) {
  */
 
 function sendErrorMessage (req, res, code) {
-  var headers = { 'Content-Type': 'application/json' };
+  const headers = {'Content-Type': 'application/json'};
 
-  var isForbidden = !Server.errorMessages.hasOwnProperty(code);
+  const isForbidden = !Server.errorMessages.hasOwnProperty(code);
   if (isForbidden) {
     res.writeHead(403, headers);
     res.end(JSON.stringify({
@@ -271,229 +464,6 @@ function sendErrorMessage (req, res, code) {
   }
 }
 
-/**
- * generate a socket id.
- * Overwrite this method to generate your custom socket id
- *
- * @param {Object} request object
- * @api public
- */
-
-Server.prototype.generateId = function (req) {
-  return base64id.generateId();
-};
-
-/**
- * Handshakes a new client.
- *
- * @param {String} transport name
- * @param {Object} request object
- * @api private
- */
-
-Server.prototype.handshake = function (transportName, req) {
-  var id = this.generateId(req);
-
-  debug('handshaking client "%s"', id);
-
-  try {
-    var transport = new transports[transportName](req);
-    if ('polling' === transportName) {
-      transport.maxHttpBufferSize = this.maxHttpBufferSize;
-      transport.httpCompression = this.httpCompression;
-    } else if ('websocket' === transportName) {
-      transport.perMessageDeflate = this.perMessageDeflate;
-    }
-
-    if (req._query && req._query.b64) {
-      transport.supportsBinary = false;
-    } else {
-      transport.supportsBinary = true;
-    }
-  } catch (e) {
-    debug('error handshaking to transport "%s"', transportName);
-    sendErrorMessage(req, req.res, Server.errors.BAD_REQUEST);
-    return;
-  }
-  var socket = new Socket(id, this, transport, req);
-  var self = this;
-
-  if (false !== this.cookie) {
-    transport.on('headers', function (headers) {
-      headers['Set-Cookie'] = cookieMod.serialize(self.cookie, id,
-        {
-          path: self.cookiePath,
-          httpOnly: self.cookiePath ? self.cookieHttpOnly : false
-        });
-    });
-  }
-
-  transport.onRequest(req);
-
-  this.clients[id] = socket;
-  this.clientsCount++;
-
-  socket.once('close', function () {
-    delete self.clients[id];
-    self.clientsCount--;
-  });
-
-  this.emit('connection', socket);
-};
-
-/**
- * Handles an Engine.IO HTTP Upgrade.
- *
- * @api public
- */
-
-Server.prototype.handleUpgrade = function (req, socket, upgradeHead) {
-  this.prepare(req);
-
-  var self = this;
-  this.verify(req, true, function (err, success) {
-    if (!success) {
-      abortConnection(socket, err);
-      return;
-    }
-
-    var head = Buffer.from(upgradeHead); // eslint-disable-line node/no-deprecated-api
-    upgradeHead = null;
-
-    // delegate to ws
-    self.ws.handleUpgrade(req, socket, head, function (conn) {
-      self.onWebSocket(req, conn);
-    });
-  });
-};
-
-/**
- * Called upon a ws.io connection.
- *
- * @param {ws.Socket} websocket
- * @api private
- */
-
-Server.prototype.onWebSocket = function (req, socket) {
-  socket.on('error', onUpgradeError);
-
-  if (transports[req._query.transport] !== undefined && !transports[req._query.transport].prototype.handlesUpgrades) {
-    debug('transport doesnt handle upgraded requests');
-    socket.close();
-    return;
-  }
-
-  // get client id
-  var id = req._query.sid;
-
-  // keep a reference to the ws.Socket
-  req.websocket = socket;
-
-  if (id) {
-    var client = this.clients[id];
-    if (!client) {
-      debug('upgrade attempt for closed client');
-      socket.close();
-    } else if (client.upgrading) {
-      debug('transport has already been trying to upgrade');
-      socket.close();
-    } else if (client.upgraded) {
-      debug('transport had already been upgraded');
-      socket.close();
-    } else {
-      debug('upgrading existing transport');
-
-      // transport error handling takes over
-      socket.removeListener('error', onUpgradeError);
-
-      var transport = new transports[req._query.transport](req);
-      if (req._query && req._query.b64) {
-        transport.supportsBinary = false;
-      } else {
-        transport.supportsBinary = true;
-      }
-      transport.perMessageDeflate = this.perMessageDeflate;
-      client.maybeUpgrade(transport);
-    }
-  } else {
-    // transport error handling takes over
-    socket.removeListener('error', onUpgradeError);
-
-    this.handshake(req._query.transport, req);
-  }
-
-  function onUpgradeError () {
-    debug('websocket error before upgrade');
-    // socket.close() not needed
-  }
-};
-
-/**
- * Captures upgrade requests for a http.Server.
- *
- * @param {http.Server} server
- * @param {Object} options
- * @api public
- */
-
-Server.prototype.attach = function (server, options) {
-  var self = this;
-  options = options || {};
-  var path = (options.path || '/engine.io').replace(/\/$/, '');
-
-  var destroyUpgradeTimeout = options.destroyUpgradeTimeout || 1000;
-
-  // normalize path
-  path += '/';
-
-  function check (req) {
-    if ('OPTIONS' === req.method && false === options.handlePreflightRequest) {
-      return false;
-    }
-    return path === req.url.substr(0, path.length);
-  }
-
-  // cache and clean up listeners
-  var listeners = server.listeners('request').slice(0);
-  server.removeAllListeners('request');
-  server.on('close', self.close.bind(self));
-  server.on('listening', self.init.bind(self));
-
-  // add request handler
-  server.on('request', function (req, res) {
-    if (check(req)) {
-      debug('intercepting request for path "%s"', path);
-      if ('OPTIONS' === req.method && 'function' === typeof options.handlePreflightRequest) {
-        options.handlePreflightRequest.call(server, req, res);
-      } else {
-        self.handleRequest(req, res);
-      }
-    } else {
-      for (var i = 0, l = listeners.length; i < l; i++) {
-        listeners[i].call(server, req, res);
-      }
-    }
-  });
-
-  if (~self.transports.indexOf('websocket')) {
-    server.on('upgrade', function (req, socket, head) {
-      if (check(req)) {
-        self.handleUpgrade(req, socket, head);
-      } else if (false !== options.destroyUpgrade) {
-        // default node behavior is to disconnect when no handlers
-        // but by adding a handler, we prevent that
-        // and if no eio thing handles the upgrade
-        // then the socket needs to die!
-        setTimeout(function () {
-          if (socket.writable && socket.bytesWritten <= 0) {
-            return socket.end();
-          }
-        }, destroyUpgradeTimeout);
-      }
-    });
-  }
-};
-
 /**
  * Closes the connection
  *
@@ -504,8 +474,8 @@ Server.prototype.attach = function (server, options) {
 
 function abortConnection (socket, code) {
   if (socket.writable) {
-    var message = Server.errorMessages.hasOwnProperty(code) ? Server.errorMessages[code] : String(code || '');
-    var length = Buffer.byteLength(message);
+    const message = Server.errorMessages.hasOwnProperty(code) ? Server.errorMessages[code] : String(code || '');
+    const length = Buffer.byteLength(message);
     socket.write(
       'HTTP/1.1 400 Bad Request\r\n' +
       'Connection: close\r\n' +
@@ -518,6 +488,8 @@ function abortConnection (socket, code) {
   socket.destroy();
 }
 
+module.exports = Server;
+
 /* eslint-disable */
 
 /**
@@ -532,7 +504,7 @@ function abortConnection (socket, code) {
  * so take care when making changes to the implementation so that the source
  * code size does not exceed v8's default max_inlined_source_size setting.
  **/
-var validHdrChars = [
+const validHdrChars = [
   0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, // 0 - 15
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16 - 31
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 32 - 47
@@ -549,7 +521,7 @@ var validHdrChars = [
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1  // ... 255
-];
+]
 
 function checkInvalidHeaderChar(val) {
   val += '';
@@ -577,7 +549,7 @@ function checkInvalidHeaderChar(val) {
     debug('invalid header, index 3, char "%s"', val.charCodeAt(3));
     return true;
   }
-  for (var i = 4; i < val.length; ++i) {
+  for (let i = 4; i < val.length; ++i) {
     if (!validHdrChars[val.charCodeAt(i)]) {
       debug('invalid header, index "%i", char "%s"', i, val.charCodeAt(i));
       return true;
diff --git a/lib/socket.js b/lib/socket.js
index 177b25c69..415a65a1d 100644
--- a/lib/socket.js
+++ b/lib/socket.js
@@ -1,486 +1,465 @@
-/**
- * Module dependencies.
- */
-
-var EventEmitter = require('events').EventEmitter;
-var util = require('util');
-var debug = require('debug')('engine:socket');
+const EventEmitter = require('events');
+const debug = require('debug')('engine:socket');
+
+class Socket extends EventEmitter {
+  /**
+   * Client class (abstract).
+   *
+   * @api private
+   */
+  constructor (id, server, transport, req) {
+    super();
+    this.id = id;
+    this.server = server;
+    this.upgrading = false;
+    this.upgraded = false;
+    this.readyState = 'opening';
+    this.writeBuffer = [];
+    this.packetsFn = [];
+    this.sentCallbackFn = [];
+    this.cleanupFn = [];
+    this.request = req;
 
-/**
- * Module exports.
- */
+    // Cache IP since it might not be in the req later
+    if (req.websocket && req.websocket._socket) {
+      this.remoteAddress = req.websocket._socket.remoteAddress;
+    } else {
+      this.remoteAddress = req.connection.remoteAddress;
+    }
 
-module.exports = Socket;
+    this.checkIntervalTimer = null;
+    this.upgradeTimeoutTimer = null;
+    this.pingTimeoutTimer = null;
 
-/**
- * Client class (abstract).
- *
- * @api private
- */
-
-function Socket (id, server, transport, req) {
-  this.id = id;
-  this.server = server;
-  this.upgrading = false;
-  this.upgraded = false;
-  this.readyState = 'opening';
-  this.writeBuffer = [];
-  this.packetsFn = [];
-  this.sentCallbackFn = [];
-  this.cleanupFn = [];
-  this.request = req;
-
-  // Cache IP since it might not be in the req later
-  if (req.websocket && req.websocket._socket) {
-    this.remoteAddress = req.websocket._socket.remoteAddress;
-  } else {
-    this.remoteAddress = req.connection.remoteAddress;
+    this.setTransport(transport);
+    this.onOpen();
   }
 
-  this.checkIntervalTimer = null;
-  this.upgradeTimeoutTimer = null;
-  this.pingTimeoutTimer = null;
-
-  this.setTransport(transport);
-  this.onOpen();
-}
-
-/**
- * Inherits from EventEmitter.
- */
+  /**
+   * Called upon transport considered open.
+   *
+   * @api private
+   */
+  onOpen () {
+    this.readyState = 'open';
+
+    // sends an `open` packet
+    this.transport.sid = this.id;
+    this.sendPacket('open', JSON.stringify({
+      sid: this.id,
+      upgrades: this.getAvailableUpgrades(),
+      pingInterval: this.server.pingInterval,
+      pingTimeout: this.server.pingTimeout
+    }));
+
+    if (this.server.initialPacket) {
+      this.sendPacket('message', this.server.initialPacket);
+    }
 
-util.inherits(Socket, EventEmitter);
+    this.emit('open');
+    this.setPingTimeout();
+  }
 
-/**
- * Called upon transport considered open.
- *
- * @api private
- */
+  /**
+   * Called upon transport packet.
+   *
+   * @param {Object} packet
+   * @api private
+   */
+  onPacket (packet) {
+    if ('open' === this.readyState) {
+      // export packet event
+      debug('packet');
+      this.emit('packet', packet);
+
+      // Reset ping timeout on any packet, incoming data is a good sign of
+      // other side's liveness
+      this.setPingTimeout();
+
+      switch (packet.type) {
+        case 'ping':
+          debug('got ping');
+          this.sendPacket('pong');
+          this.emit('heartbeat');
+          break;
+
+        case 'error':
+          this.onClose('parse error');
+          break;
+
+        case 'message':
+          this.emit('data', packet.data);
+          this.emit('message', packet.data);
+          break;
+      }
+    } else {
+      debug('packet received with closed socket');
+    }
+  }
 
-Socket.prototype.onOpen = function () {
-  this.readyState = 'open';
+  /**
+   * Called upon transport error.
+   *
+   * @param {Error} error object
+   * @api private
+   */
+  onError (err) {
+    debug('transport error');
+    this.onClose('transport error', err);
+  }
 
-  // sends an `open` packet
-  this.transport.sid = this.id;
-  this.sendPacket('open', JSON.stringify({
-    sid: this.id,
-    upgrades: this.getAvailableUpgrades(),
-    pingInterval: this.server.pingInterval,
-    pingTimeout: this.server.pingTimeout
-  }));
+  /**
+   * Sets and resets ping timeout timer based on client pings.
+   *
+   * @api private
+   */
+  setPingTimeout () {
+    clearTimeout(this.pingTimeoutTimer);
+    this.pingTimeoutTimer = setTimeout(() => {
+      this.onClose('ping timeout');
+    }, this.server.pingInterval + this.server.pingTimeout);
+  }
 
-  if (this.server.initialPacket) {
-    this.sendPacket('message', this.server.initialPacket);
+  /**
+   * Attaches handlers for the given transport.
+   *
+   * @param {Transport} transport
+   * @api private
+   */
+  setTransport (transport) {
+    const onError = this.onError.bind(this);
+    const onPacket = this.onPacket.bind(this);
+    const flush = this.flush.bind(this);
+    const onClose = this.onClose.bind(this, 'transport close');
+
+    this.transport = transport;
+    this.transport.once('error', onError);
+    this.transport.on('packet', onPacket);
+    this.transport.on('drain', flush);
+    this.transport.once('close', onClose);
+    // this function will manage packet events (also message callbacks)
+    this.setupSendCallback();
+
+    this.cleanupFn.push(function () {
+      transport.removeListener('error', onError);
+      transport.removeListener('packet', onPacket);
+      transport.removeListener('drain', flush);
+      transport.removeListener('close', onClose);
+    });
   }
 
-  this.emit('open');
-  this.setPingTimeout();
-};
-
-/**
- * Called upon transport packet.
- *
- * @param {Object} packet
- * @api private
- */
-
-Socket.prototype.onPacket = function (packet) {
-  if ('open' === this.readyState) {
-    // export packet event
-    debug('packet');
-    this.emit('packet', packet);
-
-    // Reset ping timeout on any packet, incoming data is a good sign of
-    // other side's liveness
-    this.setPingTimeout();
+  /**
+   * Upgrades socket to the given transport
+   *
+   * @param {Transport} transport
+   * @api private
+   */
+  maybeUpgrade (transport) {
+    debug('might upgrade socket transport from "%s" to "%s"'
+      , this.transport.name, transport.name);
 
-    switch (packet.type) {
-      case 'ping':
-        debug('got ping');
-        this.sendPacket('pong');
-        this.emit('heartbeat');
-        break;
-
-      case 'error':
-        this.onClose('parse error');
-        break;
-
-      case 'message':
-        this.emit('data', packet.data);
-        this.emit('message', packet.data);
-        break;
-    }
-  } else {
-    debug('packet received with closed socket');
-  }
-};
-
-/**
- * Called upon transport error.
- *
- * @param {Error} error object
- * @api private
- */
-
-Socket.prototype.onError = function (err) {
-  debug('transport error');
-  this.onClose('transport error', err);
-};
-
-/**
- * Sets and resets ping timeout timer based on client pings.
- *
- * @api private
- */
-
-Socket.prototype.setPingTimeout = function () {
-  var self = this;
-  clearTimeout(self.pingTimeoutTimer);
-  self.pingTimeoutTimer = setTimeout(function () {
-    self.onClose('ping timeout');
-  }, self.server.pingInterval + self.server.pingTimeout);
-};
-
-/**
- * Attaches handlers for the given transport.
- *
- * @param {Transport} transport
- * @api private
- */
-
-Socket.prototype.setTransport = function (transport) {
-  var onError = this.onError.bind(this);
-  var onPacket = this.onPacket.bind(this);
-  var flush = this.flush.bind(this);
-  var onClose = this.onClose.bind(this, 'transport close');
-
-  this.transport = transport;
-  this.transport.once('error', onError);
-  this.transport.on('packet', onPacket);
-  this.transport.on('drain', flush);
-  this.transport.once('close', onClose);
-  // this function will manage packet events (also message callbacks)
-  this.setupSendCallback();
-
-  this.cleanupFn.push(function () {
-    transport.removeListener('error', onError);
-    transport.removeListener('packet', onPacket);
-    transport.removeListener('drain', flush);
-    transport.removeListener('close', onClose);
-  });
-};
-
-/**
- * Upgrades socket to the given transport
- *
- * @param {Transport} transport
- * @api private
- */
-
-Socket.prototype.maybeUpgrade = function (transport) {
-  debug('might upgrade socket transport from "%s" to "%s"'
-    , this.transport.name, transport.name);
-
-  this.upgrading = true;
-
-  var self = this;
-
-  // set transport upgrade timer
-  self.upgradeTimeoutTimer = setTimeout(function () {
-    debug('client did not complete upgrade - closing transport');
-    cleanup();
-    if ('open' === transport.readyState) {
-      transport.close();
-    }
-  }, this.server.upgradeTimeout);
+    this.upgrading = true;
 
-  function onPacket (packet) {
-    if ('ping' === packet.type && 'probe' === packet.data) {
-      transport.send([{ type: 'pong', data: 'probe' }]);
-      self.emit('upgrading', transport);
-      clearInterval(self.checkIntervalTimer);
-      self.checkIntervalTimer = setInterval(check, 100);
-    } else if ('upgrade' === packet.type && self.readyState !== 'closed') {
-      debug('got upgrade packet - upgrading');
+    const self = this;
+
+    // set transport upgrade timer
+    self.upgradeTimeoutTimer = setTimeout(function () {
+      debug('client did not complete upgrade - closing transport');
       cleanup();
-      self.transport.discard();
-      self.upgraded = true;
-      self.clearTransport();
-      self.setTransport(transport);
-      self.emit('upgrade', transport);
-      self.setPingTimeout();
-      self.flush();
-      if (self.readyState === 'closing') {
-        transport.close(function () {
-          self.onClose('forced close');
-        });
+      if ('open' === transport.readyState) {
+        transport.close();
+      }
+    }, this.server.upgradeTimeout);
+
+    function onPacket (packet) {
+      if ('ping' === packet.type && 'probe' === packet.data) {
+        transport.send([{ type: 'pong', data: 'probe' }]);
+        self.emit('upgrading', transport);
+        clearInterval(self.checkIntervalTimer);
+        self.checkIntervalTimer = setInterval(check, 100);
+      } else if ('upgrade' === packet.type && self.readyState !== 'closed') {
+        debug('got upgrade packet - upgrading');
+        cleanup();
+        self.transport.discard();
+        self.upgraded = true;
+        self.clearTransport();
+        self.setTransport(transport);
+        self.emit('upgrade', transport);
+        self.setPingTimeout();
+        self.flush();
+        if (self.readyState === 'closing') {
+          transport.close(function () {
+            self.onClose('forced close');
+          });
+        }
+      } else {
+        cleanup();
+        transport.close();
       }
-    } else {
-      cleanup();
-      transport.close();
     }
-  }
 
-  // we force a polling cycle to ensure a fast upgrade
-  function check () {
-    if ('polling' === self.transport.name && self.transport.writable) {
-      debug('writing a noop packet to polling for fast upgrade');
-      self.transport.send([{ type: 'noop' }]);
+    // we force a polling cycle to ensure a fast upgrade
+    function check () {
+      if ('polling' === self.transport.name && self.transport.writable) {
+        debug('writing a noop packet to polling for fast upgrade');
+        self.transport.send([{ type: 'noop' }]);
+      }
     }
-  }
 
-  function cleanup () {
-    self.upgrading = false;
+    function cleanup () {
+      self.upgrading = false;
 
-    clearInterval(self.checkIntervalTimer);
-    self.checkIntervalTimer = null;
-
-    clearTimeout(self.upgradeTimeoutTimer);
-    self.upgradeTimeoutTimer = null;
+      clearInterval(self.checkIntervalTimer);
+      self.checkIntervalTimer = null;
 
-    transport.removeListener('packet', onPacket);
-    transport.removeListener('close', onTransportClose);
-    transport.removeListener('error', onError);
-    self.removeListener('close', onClose);
-  }
+      clearTimeout(self.upgradeTimeoutTimer);
+      self.upgradeTimeoutTimer = null;
 
-  function onError (err) {
-    debug('client did not complete upgrade - %s', err);
-    cleanup();
-    transport.close();
-    transport = null;
-  }
+      transport.removeListener('packet', onPacket);
+      transport.removeListener('close', onTransportClose);
+      transport.removeListener('error', onError);
+      self.removeListener('close', onClose);
+    }
 
-  function onTransportClose () {
-    onError('transport closed');
-  }
+    function onError (err) {
+      debug('client did not complete upgrade - %s', err);
+      cleanup();
+      transport.close();
+      transport = null;
+    }
 
-  function onClose () {
-    onError('socket closed');
-  }
+    function onTransportClose () {
+      onError('transport closed');
+    }
 
-  transport.on('packet', onPacket);
-  transport.once('close', onTransportClose);
-  transport.once('error', onError);
+    function onClose () {
+      onError('socket closed');
+    }
 
-  self.once('close', onClose);
-};
+    transport.on('packet', onPacket);
+    transport.once('close', onTransportClose);
+    transport.once('error', onError);
 
-/**
- * Clears listeners and timers associated with current transport.
- *
- * @api private
- */
+    self.once('close', onClose);
+  }
 
-Socket.prototype.clearTransport = function () {
-  var cleanup;
+  /**
+   * Clears listeners and timers associated with current transport.
+   *
+   * @api private
+   */
+  clearTransport () {
+    let cleanup;
 
-  var toCleanUp = this.cleanupFn.length;
+    const toCleanUp = this.cleanupFn.length;
 
-  for (var i = 0; i < toCleanUp; i++) {
-    cleanup = this.cleanupFn.shift();
-    cleanup();
-  }
+    for (let i = 0; i < toCleanUp; i++) {
+      cleanup = this.cleanupFn.shift();
+      cleanup();
+    }
 
-  // silence further transport errors and prevent uncaught exceptions
-  this.transport.on('error', function () {
-    debug('error triggered by discarded transport');
-  });
+    // silence further transport errors and prevent uncaught exceptions
+    this.transport.on('error', function () {
+      debug('error triggered by discarded transport');
+    });
 
-  // ensure transport won't stay open
-  this.transport.close();
+    // ensure transport won't stay open
+    this.transport.close();
 
-  clearTimeout(this.pingTimeoutTimer);
-};
+    clearTimeout(this.pingTimeoutTimer);
+  }
 
-/**
- * Called upon transport considered closed.
- * Possible reasons: `ping timeout`, `client error`, `parse error`,
- * `transport error`, `server close`, `transport close`
- */
+  /**
+   * Called upon transport considered closed.
+   * Possible reasons: `ping timeout`, `client error`, `parse error`,
+   * `transport error`, `server close`, `transport close`
+   */
+  onClose (reason, description) {
+    if ('closed' !== this.readyState) {
+      this.readyState = 'closed';
+      clearTimeout(this.pingTimeoutTimer);
+      clearInterval(this.checkIntervalTimer);
+      this.checkIntervalTimer = null;
+      clearTimeout(this.upgradeTimeoutTimer);
+      const self = this;
+      // clean writeBuffer in next tick, so developers can still
+      // grab the writeBuffer on 'close' event
+      process.nextTick(function () {
+        self.writeBuffer = [];
+      });
+      this.packetsFn = [];
+      this.sentCallbackFn = [];
+      this.clearTransport();
+      this.emit('close', reason, description);
+    }
+  }
 
-Socket.prototype.onClose = function (reason, description) {
-  if ('closed' !== this.readyState) {
-    this.readyState = 'closed';
-    clearTimeout(this.pingTimeoutTimer);
-    clearInterval(this.checkIntervalTimer);
-    this.checkIntervalTimer = null;
-    clearTimeout(this.upgradeTimeoutTimer);
-    var self = this;
-    // clean writeBuffer in next tick, so developers can still
-    // grab the writeBuffer on 'close' event
-    process.nextTick(function () {
-      self.writeBuffer = [];
+  /**
+   * Setup and manage send callback
+   *
+   * @api private
+   */
+  setupSendCallback () {
+    const self = this;
+    this.transport.on('drain', onDrain);
+
+    this.cleanupFn.push(function () {
+      self.transport.removeListener('drain', onDrain);
     });
-    this.packetsFn = [];
-    this.sentCallbackFn = [];
-    this.clearTransport();
-    this.emit('close', reason, description);
-  }
-};
-
-/**
- * Setup and manage send callback
- *
- * @api private
- */
-
-Socket.prototype.setupSendCallback = function () {
-  var self = this;
-  this.transport.on('drain', onDrain);
-
-  this.cleanupFn.push(function () {
-    self.transport.removeListener('drain', onDrain);
-  });
-
-  // the message was sent successfully, execute the callback
-  function onDrain () {
-    if (self.sentCallbackFn.length > 0) {
-      var seqFn = self.sentCallbackFn.splice(0, 1)[0];
-      if ('function' === typeof seqFn) {
-        debug('executing send callback');
-        seqFn(self.transport);
-      } else if (Array.isArray(seqFn)) {
-        debug('executing batch send callback');
-        for (var l = seqFn.length, i = 0; i < l; i++) {
-          if ('function' === typeof seqFn[i]) {
-            seqFn[i](self.transport);
+
+    // the message was sent successfully, execute the callback
+    function onDrain () {
+      if (self.sentCallbackFn.length > 0) {
+        const seqFn = self.sentCallbackFn.splice(0, 1)[0];
+        if ('function' === typeof seqFn) {
+          debug('executing send callback');
+          seqFn(self.transport);
+        } else if (Array.isArray(seqFn)) {
+          debug('executing batch send callback');
+          const l = seqFn.length;
+          let i = 0;
+          for (; i < l; i++) {
+            if ('function' === typeof seqFn[i]) {
+              seqFn[i](self.transport);
+            }
           }
         }
       }
     }
   }
-};
-
-/**
- * Sends a message packet.
- *
- * @param {String} message
- * @param {Object} options
- * @param {Function} callback
- * @return {Socket} for chaining
- * @api public
- */
-
-Socket.prototype.send =
-Socket.prototype.write = function (data, options, callback) {
-  this.sendPacket('message', data, options, callback);
-  return this;
-};
-
-/**
- * Sends a packet.
- *
- * @param {String} packet type
- * @param {String} optional, data
- * @param {Object} options
- * @api private
- */
-
-Socket.prototype.sendPacket = function (type, data, options, callback) {
-  if ('function' === typeof options) {
-    callback = options;
-    options = null;
+
+  /**
+   * Sends a message packet.
+   *
+   * @param {String} message
+   * @param {Object} options
+   * @param {Function} callback
+   * @return {Socket} for chaining
+   * @api public
+   */
+  send (data, options, callback) {
+    this.sendPacket('message', data, options, callback);
+    return this;
   }
 
-  options = options || {};
-  options.compress = false !== options.compress;
+  write (data, options, callback) {
+    this.sendPacket('message', data, options, callback);
+    return this;
+  }
 
-  if ('closing' !== this.readyState && 'closed' !== this.readyState) {
-    debug('sending packet "%s" (%s)', type, data);
+  /**
+   * Sends a packet.
+   *
+   * @param {String} packet type
+   * @param {String} optional, data
+   * @param {Object} options
+   * @api private
+   */
+  sendPacket (type, data, options, callback) {
+    if ('function' === typeof options) {
+      callback = options;
+      options = null;
+    }
 
-    var packet = {
-      type: type,
-      options: options
-    };
-    if (data) packet.data = data;
+    options = options || {};
+    options.compress = false !== options.compress;
 
-    // exports packetCreate event
-    this.emit('packetCreate', packet);
+    if ('closing' !== this.readyState && 'closed' !== this.readyState) {
+      debug('sending packet "%s" (%s)', type, data);
 
-    this.writeBuffer.push(packet);
+      const packet = {
+        type: type,
+        options: options
+      };
+      if (data) packet.data = data;
 
-    // add send callback to object, if defined
-    if (callback) this.packetsFn.push(callback);
+      // exports packetCreate event
+      this.emit('packetCreate', packet);
 
-    this.flush();
-  }
-};
-
-/**
- * Attempts to flush the packets buffer.
- *
- * @api private
- */
-
-Socket.prototype.flush = function () {
-  if ('closed' !== this.readyState &&
-                this.transport.writable &&
-                this.writeBuffer.length) {
-    debug('flushing buffer to transport');
-    this.emit('flush', this.writeBuffer);
-    this.server.emit('flush', this, this.writeBuffer);
-    var wbuf = this.writeBuffer;
-    this.writeBuffer = [];
-    if (!this.transport.supportsFraming) {
-      this.sentCallbackFn.push(this.packetsFn);
-    } else {
-      this.sentCallbackFn.push.apply(this.sentCallbackFn, this.packetsFn);
+      this.writeBuffer.push(packet);
+
+      // add send callback to object, if defined
+      if (callback) this.packetsFn.push(callback);
+
+      this.flush();
     }
-    this.packetsFn = [];
-    this.transport.send(wbuf);
-    this.emit('drain');
-    this.server.emit('drain', this);
   }
-};
-
-/**
- * Get available upgrades for this socket.
- *
- * @api private
- */
-
-Socket.prototype.getAvailableUpgrades = function () {
-  var availableUpgrades = [];
-  var allUpgrades = this.server.upgrades(this.transport.name);
-  for (var i = 0, l = allUpgrades.length; i < l; ++i) {
-    var upg = allUpgrades[i];
-    if (this.server.transports.indexOf(upg) !== -1) {
-      availableUpgrades.push(upg);
+
+  /**
+   * Attempts to flush the packets buffer.
+   *
+   * @api private
+   */
+  flush () {
+    if ('closed' !== this.readyState &&
+      this.transport.writable &&
+      this.writeBuffer.length) {
+      debug('flushing buffer to transport');
+      this.emit('flush', this.writeBuffer);
+      this.server.emit('flush', this, this.writeBuffer);
+      const wbuf = this.writeBuffer;
+      this.writeBuffer = [];
+      if (!this.transport.supportsFraming) {
+        this.sentCallbackFn.push(this.packetsFn);
+      } else {
+        this.sentCallbackFn.push.apply(this.sentCallbackFn, this.packetsFn);
+      }
+      this.packetsFn = [];
+      this.transport.send(wbuf);
+      this.emit('drain');
+      this.server.emit('drain', this);
     }
   }
-  return availableUpgrades;
-};
-
-/**
- * Closes the socket and underlying transport.
- *
- * @param {Boolean} optional, discard
- * @return {Socket} for chaining
- * @api public
- */
 
-Socket.prototype.close = function (discard) {
-  if ('open' !== this.readyState) return;
+  /**
+   * Get available upgrades for this socket.
+   *
+   * @api private
+   */
+  getAvailableUpgrades () {
+    const availableUpgrades = [];
+    const allUpgrades = this.server.upgrades(this.transport.name);
+    let i = 0;
+    const l = allUpgrades.length;
+    for (; i < l; ++i) {
+      const upg = allUpgrades[i];
+      if (this.server.transports.indexOf(upg) !== -1) {
+        availableUpgrades.push(upg);
+      }
+    }
+    return availableUpgrades;
+  }
 
-  this.readyState = 'closing';
+  /**
+   * Closes the socket and underlying transport.
+   *
+   * @param {Boolean} optional, discard
+   * @return {Socket} for chaining
+   * @api public
+   */
+  close (discard) {
+    if ('open' !== this.readyState) return;
+
+    this.readyState = 'closing';
+
+    if (this.writeBuffer.length) {
+      this.once('drain', this.closeTransport.bind(this, discard));
+      return;
+    }
 
-  if (this.writeBuffer.length) {
-    this.once('drain', this.closeTransport.bind(this, discard));
-    return;
+    this.closeTransport(discard);
   }
 
-  this.closeTransport(discard);
-};
-
-/**
- * Closes the underlying transport.
- *
- * @param {Boolean} discard
- * @api private
- */
+  /**
+   * Closes the underlying transport.
+   *
+   * @param {Boolean} discard
+   * @api private
+   */
+  closeTransport (discard) {
+    if (discard) this.transport.discard();
+    this.transport.close(this.onClose.bind(this, 'forced close'));
+  }
+}
 
-Socket.prototype.closeTransport = function (discard) {
-  if (discard) this.transport.discard();
-  this.transport.close(this.onClose.bind(this, 'forced close'));
-};
+module.exports = Socket;
diff --git a/lib/transport.js b/lib/transport.js
index 933dad5bb..0beed0a04 100644
--- a/lib/transport.js
+++ b/lib/transport.js
@@ -1,18 +1,6 @@
-
-/**
- * Module dependencies.
- */
-
-var EventEmitter = require('events').EventEmitter;
-var parser = require('engine.io-parser');
-var util = require('util');
-var debug = require('debug')('engine:transport');
-
-/**
- * Expose the constructor.
- */
-
-module.exports = Transport;
+const EventEmitter = require('events');
+const parser = require('engine.io-parser');
+const debug = require('debug')('engine:transport');
 
 /**
  * Noop function.
@@ -22,107 +10,98 @@ module.exports = Transport;
 
 function noop () {}
 
-/**
- * Transport constructor.
- *
- * @param {http.IncomingMessage} request
- * @api public
- */
-
-function Transport (req) {
-  this.readyState = 'open';
-  this.discarded = false;
-}
-
-/**
- * Inherits from EventEmitter.
- */
-
-util.inherits(Transport, EventEmitter);
-
-/**
- * Flags the transport as discarded.
- *
- * @api private
- */
-
-Transport.prototype.discard = function () {
-  this.discarded = true;
-};
-
-/**
- * Called with an incoming HTTP request.
- *
- * @param {http.IncomingMessage} request
- * @api private
- */
-
-Transport.prototype.onRequest = function (req) {
-  debug('setting request');
-  this.req = req;
-};
-
-/**
- * Closes the transport.
- *
- * @api private
- */
+class Transport extends EventEmitter {
+  /**
+   * Transport constructor.
+   *
+   * @param {http.IncomingMessage} request
+   * @api public
+   */
+  constructor (req) {
+    super();
+    this.readyState = 'open';
+    this.discarded = false;
+  }
 
-Transport.prototype.close = function (fn) {
-  if ('closed' === this.readyState || 'closing' === this.readyState) return;
+  /**
+   * Flags the transport as discarded.
+   *
+   * @api private
+   */
+  discard () {
+    this.discarded = true;
+  }
 
-  this.readyState = 'closing';
-  this.doClose(fn || noop);
-};
+  /**
+   * Called with an incoming HTTP request.
+   *
+   * @param {http.IncomingMessage} request
+   * @api private
+   */
+  onRequest (req) {
+    debug('setting request');
+    this.req = req;
+  }
 
-/**
- * Called with a transport error.
- *
- * @param {String} message error
- * @param {Object} error description
- * @api private
- */
+  /**
+   * Closes the transport.
+   *
+   * @api private
+   */
+  close (fn) {
+    if ('closed' === this.readyState || 'closing' === this.readyState) return;
 
-Transport.prototype.onError = function (msg, desc) {
-  if (this.listeners('error').length) {
-    var err = new Error(msg);
-    err.type = 'TransportError';
-    err.description = desc;
-    this.emit('error', err);
-  } else {
-    debug('ignored transport error %s (%s)', msg, desc);
+    this.readyState = 'closing';
+    this.doClose(fn || noop);
   }
-};
-
-/**
- * Called with parsed out a packets from the data stream.
- *
- * @param {Object} packet
- * @api private
- */
 
-Transport.prototype.onPacket = function (packet) {
-  this.emit('packet', packet);
-};
+  /**
+   * Called with a transport error.
+   *
+   * @param {String} message error
+   * @param {Object} error description
+   * @api private
+   */
+  onError (msg, desc) {
+    if (this.listeners('error').length) {
+      const err = new Error(msg);
+      err.type = 'TransportError';
+      err.description = desc;
+      this.emit('error', err);
+    } else {
+      debug('ignored transport error %s (%s)', msg, desc);
+    }
+  }
 
-/**
- * Called with the encoded packet data.
- *
- * @param {String} data
- * @api private
- */
+  /**
+   * Called with parsed out a packets from the data stream.
+   *
+   * @param {Object} packet
+   * @api private
+   */
+  onPacket (packet) {
+    this.emit('packet', packet);
+  }
 
-Transport.prototype.onData = function (data) {
-  this.onPacket(parser.decodePacket(data));
-};
+  /**
+   * Called with the encoded packet data.
+   *
+   * @param {String} data
+   * @api private
+   */
+  onData (data) {
+    this.onPacket(parser.decodePacket(data));
+  }
 
-/**
- * Called upon transport close.
- *
- * @api private
- */
+  /**
+   * Called upon transport close.
+   *
+   * @api private
+   */
+  onClose () {
+    this.readyState = 'closed';
+    this.emit('close');
+  }
+}
 
-Transport.prototype.onClose = function () {
-  this.readyState = 'closed';
-  this.emit('close');
-};
+module.exports = Transport;
diff --git a/lib/transports/index.js b/lib/transports/index.js
index fcff3223a..0b6a40b42 100644
--- a/lib/transports/index.js
+++ b/lib/transports/index.js
@@ -1,10 +1,5 @@
-
-/**
- * Module dependencies.
- */
-
-var XHR = require('./polling-xhr');
-var JSONP = require('./polling-jsonp');
+const XHR = require('./polling-xhr');
+const JSONP = require('./polling-jsonp');
 
 /**
  * Export transports.
diff --git a/lib/transports/polling-jsonp.js b/lib/transports/polling-jsonp.js
index 62e66e779..de3de36e7 100644
--- a/lib/transports/polling-jsonp.js
+++ b/lib/transports/polling-jsonp.js
@@ -1,75 +1,58 @@
-
-/**
- * Module dependencies.
- */
-
-var Polling = require('./polling');
-var qs = require('querystring');
-var rDoubleSlashes = /\\\\n/g;
-var rSlashes = /(\\)?\\n/g;
-var util = require('util');
-
-/**
- * Module exports.
- */
-
-module.exports = JSONP;
-
-/**
- * JSON-P polling transport.
- *
- * @api public
- */
-
-function JSONP (req) {
-  Polling.call(this, req);
-
-  this.head = '___eio[' + (req._query.j || '').replace(/[^0-9]/g, '') + '](';
-  this.foot = ');';
-}
-
-/**
- * Inherits from Polling.
- */
-
-util.inherits(JSONP, Polling);
-
-/**
- * Handles incoming data.
- * Due to a bug in \n handling by browsers, we expect a escaped string.
- *
- * @api private
- */
-
-JSONP.prototype.onData = function (data) {
-  // we leverage the qs module so that we get built-in DoS protection
-  // and the fast alternative to decodeURIComponent
-  data = qs.parse(data).d;
-  if ('string' === typeof data) {
-    // client will send already escaped newlines as \\\\n and newlines as \\n
-    // \\n must be replaced with \n and \\\\n with \\n
-    data = data.replace(rSlashes, function (match, slashes) {
-      return slashes ? match : '\n';
-    });
-    Polling.prototype.onData.call(this, data.replace(rDoubleSlashes, '\\n'));
+const Polling = require('./polling');
+const qs = require('querystring');
+const rDoubleSlashes = /\\\\n/g;
+const rSlashes = /(\\)?\\n/g;
+
+class JSONP extends Polling {
+  /**
+   * JSON-P polling transport.
+   *
+   * @api public
+   */
+  constructor (req) {
+    super(req);
+
+    this.head = '___eio[' + (req._query.j || '').replace(/[^0-9]/g, '') + '](';
+    this.foot = ');';
   }
-};
-
-/**
- * Performs the write.
- *
- * @api private
- */
 
-JSONP.prototype.doWrite = function (data, options, callback) {
-  // we must output valid javascript, not valid json
-  // see: http://timelessrepo.com/json-isnt-a-javascript-subset
-  var js = JSON.stringify(data)
-    .replace(/\u2028/g, '\\u2028')
-    .replace(/\u2029/g, '\\u2029');
+  /**
+   * Handles incoming data.
+   * Due to a bug in \n handling by browsers, we expect a escaped string.
+   *
+   * @api private
+   */
+  onData (data) {
+    // we leverage the qs module so that we get built-in DoS protection
+    // and the fast alternative to decodeURIComponent
+    data = qs.parse(data).d;
+    if ('string' === typeof data) {
+      // client will send already escaped newlines as \\\\n and newlines as \\n
+      // \\n must be replaced with \n and \\\\n with \\n
+      data = data.replace(rSlashes, function (match, slashes) {
+        return slashes ? match : '\n';
+      });
+      super.onData(data.replace(rDoubleSlashes, '\\n'));
+    }
+  }
 
-  // prepare response
-  data = this.head + js + this.foot;
+  /**
+   * Performs the write.
+   *
+   * @api private
+   */
+  doWrite (data, options, callback) {
+    // we must output valid javascript, not valid json
+    // see: http://timelessrepo.com/json-isnt-a-javascript-subset
+    const js = JSON.stringify(data)
+      .replace(/\u2028/g, '\\u2028')
+      .replace(/\u2029/g, '\\u2029');
+
+    // prepare response
+    data = this.head + js + this.foot;
+
+    super.doWrite(data, options, callback);
+  }
+}
 
-  Polling.prototype.doWrite.call(this, data, options, callback);
-};
+module.exports = JSONP;
diff --git a/lib/transports/polling-xhr.js b/lib/transports/polling-xhr.js
index 3562524e1..977e3c16d 100644
--- a/lib/transports/polling-xhr.js
+++ b/lib/transports/polling-xhr.js
@@ -1,69 +1,43 @@
-
-/**
- * Module dependencies.
- */
-
-var Polling = require('./polling');
-var util = require('util');
-
-/**
- * Module exports.
- */
-
-module.exports = XHR;
-
-/**
- * Ajax polling transport.
- *
- * @api public
- */
-
-function XHR (req) {
-  Polling.call(this, req);
-}
-
-/**
- * Inherits from Polling.
- */
-
-util.inherits(XHR, Polling);
-
-/**
- * Overrides `onRequest` to handle `OPTIONS`..
- *
- * @param {http.IncomingMessage}
- * @api private
- */
-
-XHR.prototype.onRequest = function (req) {
-  if ('OPTIONS' === req.method) {
-    var res = req.res;
-    var headers = this.headers(req);
-    headers['Access-Control-Allow-Headers'] = 'Content-Type';
-    res.writeHead(200, headers);
-    res.end();
-  } else {
-    Polling.prototype.onRequest.call(this, req);
+const Polling = require('./polling');
+
+class XHR extends Polling {
+  /**
+   * Overrides `onRequest` to handle `OPTIONS`..
+   *
+   * @param {http.IncomingMessage}
+   * @api private
+   */
+  onRequest (req) {
+    if ('OPTIONS' === req.method) {
+      const res = req.res;
+      const headers = this.headers(req);
+      headers['Access-Control-Allow-Headers'] = 'Content-Type';
+      res.writeHead(200, headers);
+      res.end();
+    } else {
+      super.onRequest(req);
+    }
   }
-};
 
-/**
- * Returns headers for a response.
- *
- * @param {http.IncomingMessage} request
- * @param {Object} extra headers
- * @api private
- */
-
-XHR.prototype.headers = function (req, headers) {
-  headers = headers || {};
-
-  if (req.headers.origin) {
-    headers['Access-Control-Allow-Credentials'] = 'true';
-    headers['Access-Control-Allow-Origin'] = req.headers.origin;
-  } else {
-    headers['Access-Control-Allow-Origin'] = '*';
+  /**
+   * Returns headers for a response.
+   *
+   * @param {http.IncomingMessage} request
+   * @param {Object} extra headers
+   * @api private
+   */
+  headers (req, headers) {
+    headers = headers || {};
+
+    if (req.headers.origin) {
+      headers['Access-Control-Allow-Credentials'] = 'true';
+      headers['Access-Control-Allow-Origin'] = req.headers.origin;
+    } else {
+      headers['Access-Control-Allow-Origin'] = '*';
+    }
+
+    return super.headers(req, headers);
   }
+}
 
-  return Polling.prototype.headers.call(this, req, headers);
-};
+module.exports = XHR;
diff --git a/lib/transports/polling.js b/lib/transports/polling.js
index 7c29c29ea..063360aaf 100644
--- a/lib/transports/polling.js
+++ b/lib/transports/polling.js
@@ -1,407 +1,380 @@
+const Transport = require('../transport');
+const parser = require('engine.io-parser');
+const zlib = require('zlib');
+const accepts = require('accepts');
+const debug = require('debug')('engine:polling');
 
-/**
- * Module requirements.
- */
-
-var Transport = require('../transport');
-var parser = require('engine.io-parser');
-var zlib = require('zlib');
-var accepts = require('accepts');
-var util = require('util');
-var debug = require('debug')('engine:polling');
-
-var compressionMethods = {
+const compressionMethods = {
   gzip: zlib.createGzip,
   deflate: zlib.createDeflate
 };
 
-/**
- * Exports the constructor.
- */
-
-module.exports = Polling;
-
-/**
- * HTTP polling constructor.
- *
- * @api public.
- */
-
-function Polling (req) {
-  Transport.call(this, req);
-
-  this.closeTimeout = 30 * 1000;
-  this.maxHttpBufferSize = null;
-  this.httpCompression = null;
-}
+class Polling extends Transport {
+  /**
+   * HTTP polling constructor.
+   *
+   * @api public.
+   */
+  constructor (req) {
+    super(req);
+
+    this.closeTimeout = 30 * 1000;
+    this.maxHttpBufferSize = null;
+    this.httpCompression = null;
+  }
 
-/**
- * Inherits from Transport.
- *
- * @api public.
- */
-
-util.inherits(Polling, Transport);
-
-/**
- * Transport name
- *
- * @api public
- */
-
-Polling.prototype.name = 'polling';
-
-/**
- * Overrides onRequest.
- *
- * @param {http.IncomingMessage}
- * @api private
- */
-
-Polling.prototype.onRequest = function (req) {
-  var res = req.res;
-
-  if ('GET' === req.method) {
-    this.onPollRequest(req, res);
-  } else if ('POST' === req.method) {
-    this.onDataRequest(req, res);
-  } else {
-    res.writeHead(500);
-    res.end();
+  /**
+   * Transport name
+   *
+   * @api public
+   */
+  get name () {
+    return 'polling';
   }
-};
 
-/**
- * The client sends a request awaiting for us to send data.
- *
- * @api private
- */
-
-Polling.prototype.onPollRequest = function (req, res) {
-  if (this.req) {
-    debug('request overlap');
-    // assert: this.res, '.req and .res should be (un)set together'
-    this.onError('overlap from client');
-    res.writeHead(500);
-    res.end();
-    return;
+  /**
+   * Overrides onRequest.
+   *
+   * @param {http.IncomingMessage}
+   * @api private
+   */
+  onRequest (req) {
+    const res = req.res;
+
+    if ('GET' === req.method) {
+      this.onPollRequest(req, res);
+    } else if ('POST' === req.method) {
+      this.onDataRequest(req, res);
+    } else {
+      res.writeHead(500);
+      res.end();
+    }
   }
 
-  debug('setting request');
+  /**
+   * The client sends a request awaiting for us to send data.
+   *
+   * @api private
+   */
+  onPollRequest (req, res) {
+    if (this.req) {
+      debug('request overlap');
+      // assert: this.res, '.req and .res should be (un)set together'
+      this.onError('overlap from client');
+      res.writeHead(500);
+      res.end();
+      return;
+    }
 
-  this.req = req;
-  this.res = res;
+    debug('setting request');
 
-  var self = this;
+    this.req = req;
+    this.res = res;
 
-  function onClose () {
-    self.onError('poll connection closed prematurely');
-  }
+    const self = this;
 
-  function cleanup () {
-    req.removeListener('close', onClose);
-    self.req = self.res = null;
-  }
+    function onClose () {
+      self.onError('poll connection closed prematurely');
+    }
 
-  req.cleanup = cleanup;
-  req.on('close', onClose);
+    function cleanup () {
+      req.removeListener('close', onClose);
+      self.req = self.res = null;
+    }
 
-  this.writable = true;
-  this.emit('drain');
+    req.cleanup = cleanup;
+    req.on('close', onClose);
 
-  // if we're still writable but had a pending close, trigger an empty send
-  if (this.writable && this.shouldClose) {
-    debug('triggering empty send to append close packet');
-    this.send([{ type: 'noop' }]);
-  }
-};
+    this.writable = true;
+    this.emit('drain');
 
-/**
- * The client sends a request with data.
- *
- * @api private
- */
-
-Polling.prototype.onDataRequest = function (req, res) {
-  if (this.dataReq) {
-    // assert: this.dataRes, '.dataReq and .dataRes should be (un)set together'
-    this.onError('data request overlap from client');
-    res.writeHead(500);
-    res.end();
-    return;
+    // if we're still writable but had a pending close, trigger an empty send
+    if (this.writable && this.shouldClose) {
+      debug('triggering empty send to append close packet');
+      this.send([{ type: 'noop' }]);
+    }
   }
 
-  var isBinary = 'application/octet-stream' === req.headers['content-type'];
-
-  this.dataReq = req;
-  this.dataRes = res;
+  /**
+   * The client sends a request with data.
+   *
+   * @api private
+   */
+  onDataRequest (req, res) {
+    if (this.dataReq) {
+      // assert: this.dataRes, '.dataReq and .dataRes should be (un)set together'
+      this.onError('data request overlap from client');
+      res.writeHead(500);
+      res.end();
+      return;
+    }
 
-  var chunks = isBinary ? Buffer.concat([]) : '';
-  var self = this;
+    const isBinary = 'application/octet-stream' === req.headers['content-type'];
 
-  function cleanup () {
-    req.removeListener('data', onData);
-    req.removeListener('end', onEnd);
-    req.removeListener('close', onClose);
-    self.dataReq = self.dataRes = chunks = null;
-  }
+    this.dataReq = req;
+    this.dataRes = res;
 
-  function onClose () {
-    cleanup();
-    self.onError('data request connection closed prematurely');
-  }
+    let chunks = isBinary ? Buffer.concat([]) : '';
+    const self = this;
 
-  function onData (data) {
-    var contentLength;
-    if (isBinary) {
-      chunks = Buffer.concat([chunks, data]);
-      contentLength = chunks.length;
-    } else {
-      chunks += data;
-      contentLength = Buffer.byteLength(chunks);
+    function cleanup () {
+      req.removeListener('data', onData);
+      req.removeListener('end', onEnd);
+      req.removeListener('close', onClose);
+      self.dataReq = self.dataRes = chunks = null;
     }
 
-    if (contentLength > self.maxHttpBufferSize) {
-      chunks = isBinary ? Buffer.concat([]) : '';
-      req.connection.destroy();
+    function onClose () {
+      cleanup();
+      self.onError('data request connection closed prematurely');
     }
-  }
 
-  function onEnd () {
-    self.onData(chunks);
-
-    var headers = {
-      // text/html is required instead of text/plain to avoid an
-      // unwanted download dialog on certain user-agents (GH-43)
-      'Content-Type': 'text/html',
-      'Content-Length': 2
-    };
+    function onData (data) {
+      let contentLength;
+      if (isBinary) {
+        chunks = Buffer.concat([chunks, data]);
+        contentLength = chunks.length;
+      } else {
+        chunks += data;
+        contentLength = Buffer.byteLength(chunks);
+      }
+
+      if (contentLength > self.maxHttpBufferSize) {
+        chunks = isBinary ? Buffer.concat([]) : '';
+        req.connection.destroy();
+      }
+    }
 
-    res.writeHead(200, self.headers(req, headers));
-    res.end('ok');
-    cleanup();
-  }
+    function onEnd () {
+      self.onData(chunks);
 
-  req.on('close', onClose);
-  if (!isBinary) req.setEncoding('utf8');
-  req.on('data', onData);
-  req.on('end', onEnd);
-};
+      const headers = {
+        // text/html is required instead of text/plain to avoid an
+        // unwanted download dialog on certain user-agents (GH-43)
+        'Content-Type': 'text/html',
+        'Content-Length': 2
+      };
 
-/**
- * Processes the incoming data payload.
- *
- * @param {String} encoded payload
- * @api private
- */
-
-Polling.prototype.onData = function (data) {
-  debug('received "%s"', data);
-  var self = this;
-  var callback = function (packet) {
-    if ('close' === packet.type) {
-      debug('got xhr close packet');
-      self.onClose();
-      return false;
+      res.writeHead(200, self.headers(req, headers));
+      res.end('ok');
+      cleanup();
     }
 
-    self.onPacket(packet);
-  };
-
-  parser.decodePayload(data, callback);
-};
+    req.on('close', onClose);
+    if (!isBinary) req.setEncoding('utf8');
+    req.on('data', onData);
+    req.on('end', onEnd);
+  }
 
-/**
- * Overrides onClose.
- *
- * @api private
- */
+  /**
+   * Processes the incoming data payload.
+   *
+   * @param {String} encoded payload
+   * @api private
+   */
+  onData (data) {
+    debug('received "%s"', data);
+    const self = this;
+    const callback = function (packet) {
+      if ('close' === packet.type) {
+        debug('got xhr close packet');
+        self.onClose();
+        return false;
+      }
+
+      self.onPacket(packet);
+    };
 
-Polling.prototype.onClose = function () {
-  if (this.writable) {
-    // close pending poll request
-    this.send([{ type: 'noop' }]);
+    parser.decodePayload(data, callback);
   }
-  Transport.prototype.onClose.call(this);
-};
 
-/**
- * Writes a packet payload.
- *
- * @param {Object} packet
- * @api private
- */
-
-Polling.prototype.send = function (packets) {
-  this.writable = false;
-
-  if (this.shouldClose) {
-    debug('appending close packet to payload');
-    packets.push({ type: 'close' });
-    this.shouldClose();
-    this.shouldClose = null;
+  /**
+   * Overrides onClose.
+   *
+   * @api private
+   */
+  onClose () {
+    if (this.writable) {
+      // close pending poll request
+      this.send([{ type: 'noop' }]);
+    }
+    super.onClose();
   }
 
-  var self = this;
-  parser.encodePayload(packets, this.supportsBinary, function (data) {
-    var compress = packets.some(function (packet) {
-      return packet.options && packet.options.compress;
-    });
-    self.write(data, { compress: compress });
-  });
-};
-
-/**
- * Writes data as response to poll request.
- *
- * @param {String} data
- * @param {Object} options
- * @api private
- */
-
-Polling.prototype.write = function (data, options) {
-  debug('writing "%s"', data);
-  var self = this;
-  this.doWrite(data, options, function () {
-    self.req.cleanup();
-  });
-};
-
-/**
- * Performs the write.
- *
- * @api private
- */
-
-Polling.prototype.doWrite = function (data, options, callback) {
-  var self = this;
-
-  // explicit UTF-8 is required for pages not served under utf
-  var isString = typeof data === 'string';
-  var contentType = isString
-    ? 'text/plain; charset=UTF-8'
-    : 'application/octet-stream';
-
-  var headers = {
-    'Content-Type': contentType
-  };
+  /**
+   * Writes a packet payload.
+   *
+   * @param {Object} packet
+   * @api private
+   */
+  send (packets) {
+    this.writable = false;
+
+    if (this.shouldClose) {
+      debug('appending close packet to payload');
+      packets.push({ type: 'close' });
+      this.shouldClose();
+      this.shouldClose = null;
+    }
 
-  if (!this.httpCompression || !options.compress) {
-    respond(data);
-    return;
+    const self = this;
+    parser.encodePayload(packets, this.supportsBinary, function (data) {
+      const compress = packets.some(function (packet) {
+        return packet.options && packet.options.compress;
+      });
+      self.write(data, { compress: compress });
+    });
   }
 
-  var len = isString ? Buffer.byteLength(data) : data.length;
-  if (len < this.httpCompression.threshold) {
-    respond(data);
-    return;
+  /**
+   * Writes data as response to poll request.
+   *
+   * @param {String} data
+   * @param {Object} options
+   * @api private
+   */
+  write (data, options) {
+    debug('writing "%s"', data);
+    const self = this;
+    this.doWrite(data, options, function () {
+      self.req.cleanup();
+    });
   }
 
-  var encoding = accepts(this.req).encodings(['gzip', 'deflate']);
-  if (!encoding) {
-    respond(data);
-    return;
-  }
+  /**
+   * Performs the write.
+   *
+   * @api private
+   */
+  doWrite (data, options, callback) {
+    const self = this;
+
+    // explicit UTF-8 is required for pages not served under utf
+    const isString = typeof data === 'string';
+    const contentType = isString
+      ? 'text/plain; charset=UTF-8'
+      : 'application/octet-stream';
+
+    const headers = {
+      'Content-Type': contentType
+    };
+
+    if (!this.httpCompression || !options.compress) {
+      respond(data);
+      return;
+    }
+
+    const len = isString ? Buffer.byteLength(data) : data.length;
+    if (len < this.httpCompression.threshold) {
+      respond(data);
+      return;
+    }
 
-  this.compress(data, encoding, function (err, data) {
-    if (err) {
-      self.res.writeHead(500);
-      self.res.end();
-      callback(err);
+    const encoding = accepts(this.req).encodings(['gzip', 'deflate']);
+    if (!encoding) {
+      respond(data);
       return;
     }
 
-    headers['Content-Encoding'] = encoding;
-    respond(data);
-  });
+    this.compress(data, encoding, function (err, data) {
+      if (err) {
+        self.res.writeHead(500);
+        self.res.end();
+        callback(err);
+        return;
+      }
+
+      headers['Content-Encoding'] = encoding;
+      respond(data);
+    });
 
-  function respond (data) {
-    headers['Content-Length'] = 'string' === typeof data ? Buffer.byteLength(data) : data.length;
-    self.res.writeHead(200, self.headers(self.req, headers));
-    self.res.end(data);
-    callback();
+    function respond (data) {
+      headers['Content-Length'] = 'string' === typeof data ? Buffer.byteLength(data) : data.length;
+      self.res.writeHead(200, self.headers(self.req, headers));
+      self.res.end(data);
+      callback();
+    }
   }
-};
 
-/**
- * Compresses data.
- *
- * @api private
- */
-
-Polling.prototype.compress = function (data, encoding, callback) {
-  debug('compressing');
-
-  var buffers = [];
-  var nread = 0;
-
-  compressionMethods[encoding](this.httpCompression)
-    .on('error', callback)
-    .on('data', function (chunk) {
-      buffers.push(chunk);
-      nread += chunk.length;
-    })
-    .on('end', function () {
-      callback(null, Buffer.concat(buffers, nread));
-    })
-    .end(data);
-};
+  /**
+   * Compresses data.
+   *
+   * @api private
+   */
+  compress (data, encoding, callback) {
+    debug('compressing');
+
+    const buffers = [];
+    let nread = 0;
+
+    compressionMethods[encoding](this.httpCompression)
+      .on('error', callback)
+      .on('data', function (chunk) {
+        buffers.push(chunk);
+        nread += chunk.length;
+      })
+      .on('end', function () {
+        callback(null, Buffer.concat(buffers, nread));
+      })
+      .end(data);
+  }
 
-/**
- * Closes the transport.
- *
- * @api private
- */
+  /**
+   * Closes the transport.
+   *
+   * @api private
+   */
+  doClose (fn) {
+    debug('closing');
 
-Polling.prototype.doClose = function (fn) {
-  debug('closing');
+    const self = this;
+    let closeTimeoutTimer;
 
-  var self = this;
-  var closeTimeoutTimer;
+    if (this.dataReq) {
+      debug('aborting ongoing data request');
+      this.dataReq.destroy();
+    }
 
-  if (this.dataReq) {
-    debug('aborting ongoing data request');
-    this.dataReq.destroy();
-  }
+    if (this.writable) {
+      debug('transport writable - closing right away');
+      this.send([{ type: 'close' }]);
+      onClose();
+    } else if (this.discarded) {
+      debug('transport discarded - closing right away');
+      onClose();
+    } else {
+      debug('transport not writable - buffering orderly close');
+      this.shouldClose = onClose;
+      closeTimeoutTimer = setTimeout(onClose, this.closeTimeout);
+    }
 
-  if (this.writable) {
-    debug('transport writable - closing right away');
-    this.send([{ type: 'close' }]);
-    onClose();
-  } else if (this.discarded) {
-    debug('transport discarded - closing right away');
-    onClose();
-  } else {
-    debug('transport not writable - buffering orderly close');
-    this.shouldClose = onClose;
-    closeTimeoutTimer = setTimeout(onClose, this.closeTimeout);
+    function onClose () {
+      clearTimeout(closeTimeoutTimer);
+      fn();
+      self.onClose();
+    }
   }
 
-  function onClose () {
-    clearTimeout(closeTimeoutTimer);
-    fn();
-    self.onClose();
-  }
-};
+  /**
+   * Returns headers for a response.
+   *
+   * @param {http.IncomingMessage} request
+   * @param {Object} extra headers
+   * @api private
+   */
+  headers (req, headers) {
+    headers = headers || {};
+
+    // prevent XSS warnings on IE
+    // https://github.com/LearnBoost/socket.io/pull/1333
+    const ua = req.headers['user-agent'];
+    if (ua && (~ua.indexOf(';MSIE') || ~ua.indexOf('Trident/'))) {
+      headers['X-XSS-Protection'] = '0';
+    }
 
-/**
- * Returns headers for a response.
- *
- * @param {http.IncomingMessage} request
- * @param {Object} extra headers
- * @api private
- */
-
-Polling.prototype.headers = function (req, headers) {
-  headers = headers || {};
-
-  // prevent XSS warnings on IE
-  // https://github.com/LearnBoost/socket.io/pull/1333
-  var ua = req.headers['user-agent'];
-  if (ua && (~ua.indexOf(';MSIE') || ~ua.indexOf('Trident/'))) {
-    headers['X-XSS-Protection'] = '0';
+    this.emit('headers', headers);
+    return headers;
   }
+}
 
-  this.emit('headers', headers);
-  return headers;
-};
+module.exports = Polling;
diff --git a/lib/transports/websocket.js b/lib/transports/websocket.js
index 7d5511b1d..ee228e9ee 100644
--- a/lib/transports/websocket.js
+++ b/lib/transports/websocket.js
@@ -1,134 +1,116 @@
-
-/**
- * Module dependencies.
- */
-
-var Transport = require('../transport');
-var parser = require('engine.io-parser');
-var util = require('util');
-var debug = require('debug')('engine:ws');
-
-/**
- * Export the constructor.
- */
-
-module.exports = WebSocket;
-
-/**
- * WebSocket transport
- *
- * @param {http.IncomingMessage}
- * @api public
- */
-
-function WebSocket (req) {
-  Transport.call(this, req);
-  var self = this;
-  this.socket = req.websocket;
-  this.socket.on('message', this.onData.bind(this));
-  this.socket.once('close', this.onClose.bind(this));
-  this.socket.on('error', this.onError.bind(this));
-  this.socket.on('headers', onHeaders);
-  this.writable = true;
-  this.perMessageDeflate = null;
-
-  function onHeaders (headers) {
-    self.emit('headers', headers);
+const Transport = require('../transport');
+const parser = require('engine.io-parser');
+const debug = require('debug')('engine:ws');
+
+class WebSocket extends Transport {
+  /**
+   * WebSocket transport
+   *
+   * @param {http.IncomingMessage}
+   * @api public
+   */
+  constructor (req) {
+    super(req);
+    this.socket = req.websocket;
+    this.socket.on('message', this.onData.bind(this));
+    this.socket.once('close', this.onClose.bind(this));
+    this.socket.on('error', this.onError.bind(this));
+    this.socket.on('headers', (headers) => {
+      this.emit('headers', headers);
+    });
+    this.writable = true;
+    this.perMessageDeflate = null;
   }
-}
-
-/**
- * Inherits from Transport.
- */
-
-util.inherits(WebSocket, Transport);
-
-/**
- * Transport name
- *
- * @api public
- */
-
-WebSocket.prototype.name = 'websocket';
-
-/**
- * Advertise upgrade support.
- *
- * @api public
- */
 
-WebSocket.prototype.handlesUpgrades = true;
-
-/**
- * Advertise framing support.
- *
- * @api public
- */
+  /**
+   * Transport name
+   *
+   * @api public
+   */
+  get name () {
+    return 'websocket';
+  }
 
-WebSocket.prototype.supportsFraming = true;
+  /**
+   * Advertise upgrade support.
+   *
+   * @api public
+   */
+  get handlesUpgrades () {
+    return true;
+  }
 
-/**
- * Processes the incoming data.
- *
- * @param {String} encoded packet
- * @api private
- */
+  /**
+   * Advertise framing support.
+   *
+   * @api public
+   */
+  get supportsFraming () {
+    return true;
+  }
 
-WebSocket.prototype.onData = function (data) {
-  debug('received "%s"', data);
-  Transport.prototype.onData.call(this, data);
-};
+  /**
+   * Processes the incoming data.
+   *
+   * @param {String} encoded packet
+   * @api private
+   */
+  onData (data) {
+    debug('received "%s"', data);
+    super.onData(data);
+  }
 
-/**
- * Writes a packet payload.
- *
- * @param {Array} packets
- * @api private
- */
+  /**
+   * Writes a packet payload.
+   *
+   * @param {Array} packets
+   * @api private
+   */
+  send (packets) {
+    var self = this;
+
+    for (var i = 0; i < packets.length; i++) {
+      var packet = packets[i];
+      parser.encodePacket(packet, self.supportsBinary, send);
+    }
 
-WebSocket.prototype.send = function (packets) {
-  var self = this;
+    function send (data) {
+      debug('writing "%s"', data);
 
-  for (var i = 0; i < packets.length; i++) {
-    var packet = packets[i];
-    parser.encodePacket(packet, self.supportsBinary, send);
-  }
+      // always creates a new object since ws modifies it
+      var opts = {};
+      if (packet.options) {
+        opts.compress = packet.options.compress;
+      }
 
-  function send (data) {
-    debug('writing "%s"', data);
+      if (self.perMessageDeflate) {
+        var len = 'string' === typeof data ? Buffer.byteLength(data) : data.length;
+        if (len < self.perMessageDeflate.threshold) {
+          opts.compress = false;
+        }
+      }
 
-    // always creates a new object since ws modifies it
-    var opts = {};
-    if (packet.options) {
-      opts.compress = packet.options.compress;
+      self.writable = false;
+      self.socket.send(data, opts, onEnd);
     }
 
-    if (self.perMessageDeflate) {
-      var len = 'string' === typeof data ? Buffer.byteLength(data) : data.length;
-      if (len < self.perMessageDeflate.threshold) {
-        opts.compress = false;
-      }
+    function onEnd (err) {
+      if (err) return self.onError('write error', err.stack);
+      self.writable = true;
+      self.emit('drain');
     }
-
-    self.writable = false;
-    self.socket.send(data, opts, onEnd);
   }
 
-  function onEnd (err) {
-    if (err) return self.onError('write error', err.stack);
-    self.writable = true;
-    self.emit('drain');
+  /**
+   * Closes the transport.
+   *
+   * @api private
+   */
+  doClose (fn) {
+    debug('closing');
+    this.socket.close();
+    fn && fn();
   }
-};
-
-/**
- * Closes the transport.
- *
- * @api private
- */
+}
 
-WebSocket.prototype.doClose = function (fn) {
-  debug('closing');
-  this.socket.close();
-  fn && fn();
-};
+module.exports = WebSocket;
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 000000000..542c3b12f
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2780 @@
+{
+  "name": "engine.io",
+  "version": "3.4.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.0.0-beta.44",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0-beta.44.tgz",
+      "integrity": "sha512-cuAuTTIQ9RqcFRJ/Y8PvTh+paepNcaGxwQwjIDRWPXmzzyAeCO4KqS9ikMvq0MCbRk6GlYKwfzStrcP3/jSL8g==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "7.0.0-beta.44"
+      }
+    },
+    "@babel/generator": {
+      "version": "7.0.0-beta.44",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.0.0-beta.44.tgz",
+      "integrity": "sha512-5xVb7hlhjGcdkKpMXgicAVgx8syK5VJz193k0i/0sLP6DzE6lRrU1K3B/rFefgdo9LPGMAOOOAWW4jycj07ShQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "7.0.0-beta.44",
+        "jsesc": "^2.5.1",
+        "lodash": "^4.2.0",
+        "source-map": "^0.5.0",
+        "trim-right": "^1.0.1"
+      }
+    },
+    "@babel/helper-function-name": {
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