diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4e93f51c1..7ef032446 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## [4.0.2](https://github.com/socketio/engine.io-client/compare/4.0.1...4.0.2) (2020-11-09)
+
+
 ## [4.0.1](https://github.com/socketio/engine.io-client/compare/4.0.0...4.0.1) (2020-10-21)
 
 
diff --git a/dist/engine.io.js b/dist/engine.io.js
index 0aab8b54d..d95cb7d78 100644
--- a/dist/engine.io.js
+++ b/dist/engine.io.js
@@ -1,5 +1,5 @@
 /*!
- * Engine.IO v4.0.1
+ * Engine.IO v4.0.2
  * (c) 2014-2020 Guillermo Rauch
  * Released under the MIT License.
  */
@@ -184,7 +184,7 @@ eval("function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbo
 /*! no static exports found */
 /***/ (function(module, exports, __webpack_require__) {
 
-eval("function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nfunction _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }\n\nfunction _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }\n\nfunction _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === \"object\" || typeof call === \"function\")) { return call; } return _assertThisInitialized(self); }\n\nfunction _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\"); } return self; }\n\nfunction _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }\n\nfunction _inherits(subClass, superClass) { if (typeof superClass !== \"function\" && superClass !== null) { throw new TypeError(\"Super expression must either be null or a function\"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }\n\nfunction _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }\n\n/* global attachEvent */\nvar XMLHttpRequest = __webpack_require__(/*! xmlhttprequest-ssl */ \"./lib/xmlhttprequest.js\");\n\nvar Polling = __webpack_require__(/*! ./polling */ \"./lib/transports/polling.js\");\n\nvar Emitter = __webpack_require__(/*! component-emitter */ \"./node_modules/component-emitter/index.js\");\n\nvar _require = __webpack_require__(/*! ../util */ \"./lib/util.js\"),\n    pick = _require.pick;\n\nvar globalThis = __webpack_require__(/*! ../globalThis */ \"./lib/globalThis.browser.js\");\n\nvar debug = __webpack_require__(/*! debug */ \"./node_modules/debug/src/browser.js\")(\"engine.io-client:polling-xhr\");\n/**\n * Empty function\n */\n\n\nfunction empty() {}\n\nvar hasXHR2 = function () {\n  var XMLHttpRequest = __webpack_require__(/*! xmlhttprequest-ssl */ \"./lib/xmlhttprequest.js\");\n\n  var xhr = new XMLHttpRequest({\n    xdomain: false\n  });\n  return null != xhr.responseType;\n}();\n\nvar XHR =\n/*#__PURE__*/\nfunction (_Polling) {\n  _inherits(XHR, _Polling);\n\n  /**\n   * XHR Polling constructor.\n   *\n   * @param {Object} opts\n   * @api public\n   */\n  function XHR(opts) {\n    var _this;\n\n    _classCallCheck(this, XHR);\n\n    _this = _possibleConstructorReturn(this, _getPrototypeOf(XHR).call(this, opts));\n\n    if (typeof location !== \"undefined\") {\n      var isSSL = \"https:\" === location.protocol;\n      var port = location.port; // some user agents have empty `location.port`\n\n      if (!port) {\n        port = isSSL ? 443 : 80;\n      }\n\n      _this.xd = typeof location !== \"undefined\" && opts.hostname !== location.hostname || port !== opts.port;\n      _this.xs = opts.secure !== isSSL;\n    }\n    /**\n     * XHR supports binary\n     */\n\n\n    var forceBase64 = opts && opts.forceBase64;\n    _this.supportsBinary = hasXHR2 && !forceBase64;\n    return _this;\n  }\n  /**\n   * Creates a request.\n   *\n   * @param {String} method\n   * @api private\n   */\n\n\n  _createClass(XHR, [{\n    key: \"request\",\n    value: function request() {\n      var opts = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};\n\n      _extends(opts, {\n        supportsBinary: this.supportsBinary,\n        xd: this.xd,\n        xs: this.xs\n      }, this.opts);\n\n      return new Request(this.uri(), opts);\n    }\n    /**\n     * Sends data.\n     *\n     * @param {String} data to send.\n     * @param {Function} called upon flush.\n     * @api private\n     */\n\n  }, {\n    key: \"doWrite\",\n    value: function doWrite(data, fn) {\n      var isBinary = typeof data !== \"string\" && data !== undefined;\n      var req = this.request({\n        method: \"POST\",\n        data: data,\n        isBinary: isBinary\n      });\n      var self = this;\n      req.on(\"success\", fn);\n      req.on(\"error\", function (err) {\n        self.onError(\"xhr post error\", err);\n      });\n    }\n    /**\n     * Starts a poll cycle.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"doPoll\",\n    value: function doPoll() {\n      debug(\"xhr poll\");\n      var req = this.request();\n      var self = this;\n      req.on(\"data\", function (data) {\n        self.onData(data);\n      });\n      req.on(\"error\", function (err) {\n        self.onError(\"xhr poll error\", err);\n      });\n      this.pollXhr = req;\n    }\n  }]);\n\n  return XHR;\n}(Polling);\n\nvar Request =\n/*#__PURE__*/\nfunction (_Emitter) {\n  _inherits(Request, _Emitter);\n\n  /**\n   * Request constructor\n   *\n   * @param {Object} options\n   * @api public\n   */\n  function Request(uri, opts) {\n    var _this2;\n\n    _classCallCheck(this, Request);\n\n    _this2 = _possibleConstructorReturn(this, _getPrototypeOf(Request).call(this));\n    _this2.opts = opts;\n    _this2.method = opts.method || \"GET\";\n    _this2.uri = uri;\n    _this2.async = false !== opts.async;\n    _this2.data = undefined !== opts.data ? opts.data : null;\n    _this2.isBinary = opts.isBinary;\n    _this2.supportsBinary = opts.supportsBinary;\n\n    _this2.create();\n\n    return _this2;\n  }\n  /**\n   * Creates the XHR object and sends the request.\n   *\n   * @api private\n   */\n\n\n  _createClass(Request, [{\n    key: \"create\",\n    value: function create() {\n      var opts = pick(this.opts, \"agent\", \"enablesXDR\", \"pfx\", \"key\", \"passphrase\", \"cert\", \"ca\", \"ciphers\", \"rejectUnauthorized\");\n      opts.xdomain = !!this.opts.xd;\n      opts.xscheme = !!this.opts.xs;\n      var xhr = this.xhr = new XMLHttpRequest(opts);\n      var self = this;\n\n      try {\n        debug(\"xhr open %s: %s\", this.method, this.uri);\n        xhr.open(this.method, this.uri, this.async);\n\n        try {\n          if (this.opts.extraHeaders) {\n            xhr.setDisableHeaderCheck && xhr.setDisableHeaderCheck(true);\n\n            for (var i in this.opts.extraHeaders) {\n              if (this.opts.extraHeaders.hasOwnProperty(i)) {\n                xhr.setRequestHeader(i, this.opts.extraHeaders[i]);\n              }\n            }\n          }\n        } catch (e) {\n          console.log(e);\n        }\n\n        if (\"POST\" === this.method) {\n          try {\n            if (this.isBinary) {\n              xhr.setRequestHeader(\"Content-type\", \"application/octet-stream\");\n            } else {\n              xhr.setRequestHeader(\"Content-type\", \"text/plain;charset=UTF-8\");\n            }\n          } catch (e) {}\n        }\n\n        try {\n          xhr.setRequestHeader(\"Accept\", \"*/*\");\n        } catch (e) {} // ie6 check\n\n\n        if (\"withCredentials\" in xhr) {\n          xhr.withCredentials = this.opts.withCredentials;\n        }\n\n        if (this.opts.requestTimeout) {\n          xhr.timeout = this.opts.requestTimeout;\n        }\n\n        if (this.hasXDR()) {\n          xhr.onload = function () {\n            self.onLoad();\n          };\n\n          xhr.onerror = function () {\n            self.onError(xhr.responseText);\n          };\n        } else {\n          xhr.onreadystatechange = function () {\n            if (xhr.readyState === 2) {\n              try {\n                var contentType = xhr.getResponseHeader(\"Content-Type\");\n\n                if (self.supportsBinary && contentType === \"application/octet-stream\" || contentType === \"application/octet-stream; charset=UTF-8\") {\n                  xhr.responseType = \"arraybuffer\";\n                }\n              } catch (e) {}\n            }\n\n            if (4 !== xhr.readyState) return;\n\n            if (200 === xhr.status || 1223 === xhr.status) {\n              self.onLoad();\n            } else {\n              // make sure the `error` event handler that's user-set\n              // does not throw in the same tick and gets caught here\n              setTimeout(function () {\n                self.onError(typeof xhr.status === \"number\" ? xhr.status : 0);\n              }, 0);\n            }\n          };\n        }\n\n        debug(\"xhr data %s\", this.data);\n        xhr.send(this.data);\n      } catch (e) {\n        // Need to defer since .create() is called directly from the constructor\n        // and thus the 'error' event can only be only bound *after* this exception\n        // occurs.  Therefore, also, we cannot throw here at all.\n        setTimeout(function () {\n          self.onError(e);\n        }, 0);\n        return;\n      }\n\n      if (typeof document !== \"undefined\") {\n        this.index = Request.requestsCount++;\n        Request.requests[this.index] = this;\n      }\n    }\n    /**\n     * Called upon successful response.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onSuccess\",\n    value: function onSuccess() {\n      this.emit(\"success\");\n      this.cleanup();\n    }\n    /**\n     * Called if we have data.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onData\",\n    value: function onData(data) {\n      this.emit(\"data\", data);\n      this.onSuccess();\n    }\n    /**\n     * Called upon error.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onError\",\n    value: function onError(err) {\n      this.emit(\"error\", err);\n      this.cleanup(true);\n    }\n    /**\n     * Cleans up house.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"cleanup\",\n    value: function cleanup(fromError) {\n      if (\"undefined\" === typeof this.xhr || null === this.xhr) {\n        return;\n      } // xmlhttprequest\n\n\n      if (this.hasXDR()) {\n        this.xhr.onload = this.xhr.onerror = empty;\n      } else {\n        this.xhr.onreadystatechange = empty;\n      }\n\n      if (fromError) {\n        try {\n          this.xhr.abort();\n        } catch (e) {}\n      }\n\n      if (typeof document !== \"undefined\") {\n        delete Request.requests[this.index];\n      }\n\n      this.xhr = null;\n    }\n    /**\n     * Called upon load.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onLoad\",\n    value: function onLoad() {\n      var data;\n\n      try {\n        var contentType;\n\n        try {\n          contentType = this.xhr.getResponseHeader(\"Content-Type\");\n        } catch (e) {}\n\n        if (contentType === \"application/octet-stream\" || contentType === \"application/octet-stream; charset=UTF-8\") {\n          data = this.xhr.response || this.xhr.responseText;\n        } else {\n          data = this.xhr.responseText;\n        }\n      } catch (e) {\n        this.onError(e);\n      }\n\n      if (null != data) {\n        this.onData(data);\n      }\n    }\n    /**\n     * Check if it has XDomainRequest.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"hasXDR\",\n    value: function hasXDR() {\n      return typeof XDomainRequest !== \"undefined\" && !this.xs && this.enablesXDR;\n    }\n    /**\n     * Aborts the request.\n     *\n     * @api public\n     */\n\n  }, {\n    key: \"abort\",\n    value: function abort() {\n      this.cleanup();\n    }\n  }]);\n\n  return Request;\n}(Emitter);\n/**\n * Aborts pending requests when unloading the window. This is needed to prevent\n * memory leaks (e.g. when using IE) and to ensure that no spurious error is\n * emitted.\n */\n\n\nRequest.requestsCount = 0;\nRequest.requests = {};\n\nif (typeof document !== \"undefined\") {\n  if (typeof attachEvent === \"function\") {\n    attachEvent(\"onunload\", unloadHandler);\n  } else if (typeof addEventListener === \"function\") {\n    var terminationEvent = \"onpagehide\" in globalThis ? \"pagehide\" : \"unload\";\n    addEventListener(terminationEvent, unloadHandler, false);\n  }\n}\n\nfunction unloadHandler() {\n  for (var i in Request.requests) {\n    if (Request.requests.hasOwnProperty(i)) {\n      Request.requests[i].abort();\n    }\n  }\n}\n\nmodule.exports = XHR;\nmodule.exports.Request = Request;\n\n//# sourceURL=webpack://eio/./lib/transports/polling-xhr.js?");
+eval("function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nfunction _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }\n\nfunction _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }\n\nfunction _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === \"object\" || typeof call === \"function\")) { return call; } return _assertThisInitialized(self); }\n\nfunction _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\"); } return self; }\n\nfunction _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }\n\nfunction _inherits(subClass, superClass) { if (typeof superClass !== \"function\" && superClass !== null) { throw new TypeError(\"Super expression must either be null or a function\"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }\n\nfunction _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }\n\n/* global attachEvent */\nvar XMLHttpRequest = __webpack_require__(/*! xmlhttprequest-ssl */ \"./lib/xmlhttprequest.js\");\n\nvar Polling = __webpack_require__(/*! ./polling */ \"./lib/transports/polling.js\");\n\nvar Emitter = __webpack_require__(/*! component-emitter */ \"./node_modules/component-emitter/index.js\");\n\nvar _require = __webpack_require__(/*! ../util */ \"./lib/util.js\"),\n    pick = _require.pick;\n\nvar globalThis = __webpack_require__(/*! ../globalThis */ \"./lib/globalThis.browser.js\");\n\nvar debug = __webpack_require__(/*! debug */ \"./node_modules/debug/src/browser.js\")(\"engine.io-client:polling-xhr\");\n/**\n * Empty function\n */\n\n\nfunction empty() {}\n\nvar hasXHR2 = function () {\n  var XMLHttpRequest = __webpack_require__(/*! xmlhttprequest-ssl */ \"./lib/xmlhttprequest.js\");\n\n  var xhr = new XMLHttpRequest({\n    xdomain: false\n  });\n  return null != xhr.responseType;\n}();\n\nvar XHR =\n/*#__PURE__*/\nfunction (_Polling) {\n  _inherits(XHR, _Polling);\n\n  /**\n   * XHR Polling constructor.\n   *\n   * @param {Object} opts\n   * @api public\n   */\n  function XHR(opts) {\n    var _this;\n\n    _classCallCheck(this, XHR);\n\n    _this = _possibleConstructorReturn(this, _getPrototypeOf(XHR).call(this, opts));\n\n    if (typeof location !== \"undefined\") {\n      var isSSL = \"https:\" === location.protocol;\n      var port = location.port; // some user agents have empty `location.port`\n\n      if (!port) {\n        port = isSSL ? 443 : 80;\n      }\n\n      _this.xd = typeof location !== \"undefined\" && opts.hostname !== location.hostname || port !== opts.port;\n      _this.xs = opts.secure !== isSSL;\n    }\n    /**\n     * XHR supports binary\n     */\n\n\n    var forceBase64 = opts && opts.forceBase64;\n    _this.supportsBinary = hasXHR2 && !forceBase64;\n    return _this;\n  }\n  /**\n   * Creates a request.\n   *\n   * @param {String} method\n   * @api private\n   */\n\n\n  _createClass(XHR, [{\n    key: \"request\",\n    value: function request() {\n      var opts = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};\n\n      _extends(opts, {\n        supportsBinary: this.supportsBinary,\n        xd: this.xd,\n        xs: this.xs\n      }, this.opts);\n\n      return new Request(this.uri(), opts);\n    }\n    /**\n     * Sends data.\n     *\n     * @param {String} data to send.\n     * @param {Function} called upon flush.\n     * @api private\n     */\n\n  }, {\n    key: \"doWrite\",\n    value: function doWrite(data, fn) {\n      var isBinary = typeof data !== \"string\" && data !== undefined;\n      var req = this.request({\n        method: \"POST\",\n        data: data,\n        isBinary: isBinary\n      });\n      var self = this;\n      req.on(\"success\", fn);\n      req.on(\"error\", function (err) {\n        self.onError(\"xhr post error\", err);\n      });\n    }\n    /**\n     * Starts a poll cycle.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"doPoll\",\n    value: function doPoll() {\n      debug(\"xhr poll\");\n      var req = this.request();\n      var self = this;\n      req.on(\"data\", function (data) {\n        self.onData(data);\n      });\n      req.on(\"error\", function (err) {\n        self.onError(\"xhr poll error\", err);\n      });\n      this.pollXhr = req;\n    }\n  }]);\n\n  return XHR;\n}(Polling);\n\nvar Request =\n/*#__PURE__*/\nfunction (_Emitter) {\n  _inherits(Request, _Emitter);\n\n  /**\n   * Request constructor\n   *\n   * @param {Object} options\n   * @api public\n   */\n  function Request(uri, opts) {\n    var _this2;\n\n    _classCallCheck(this, Request);\n\n    _this2 = _possibleConstructorReturn(this, _getPrototypeOf(Request).call(this));\n    _this2.opts = opts;\n    _this2.method = opts.method || \"GET\";\n    _this2.uri = uri;\n    _this2.async = false !== opts.async;\n    _this2.data = undefined !== opts.data ? opts.data : null;\n    _this2.isBinary = opts.isBinary;\n    _this2.supportsBinary = opts.supportsBinary;\n\n    _this2.create();\n\n    return _this2;\n  }\n  /**\n   * Creates the XHR object and sends the request.\n   *\n   * @api private\n   */\n\n\n  _createClass(Request, [{\n    key: \"create\",\n    value: function create() {\n      var opts = pick(this.opts, \"agent\", \"enablesXDR\", \"pfx\", \"key\", \"passphrase\", \"cert\", \"ca\", \"ciphers\", \"rejectUnauthorized\");\n      opts.xdomain = !!this.opts.xd;\n      opts.xscheme = !!this.opts.xs;\n      var xhr = this.xhr = new XMLHttpRequest(opts);\n      var self = this;\n\n      try {\n        debug(\"xhr open %s: %s\", this.method, this.uri);\n        xhr.open(this.method, this.uri, this.async);\n\n        try {\n          if (this.opts.extraHeaders) {\n            xhr.setDisableHeaderCheck && xhr.setDisableHeaderCheck(true);\n\n            for (var i in this.opts.extraHeaders) {\n              if (this.opts.extraHeaders.hasOwnProperty(i)) {\n                xhr.setRequestHeader(i, this.opts.extraHeaders[i]);\n              }\n            }\n          }\n        } catch (e) {\n          console.log(e);\n        }\n\n        if (\"POST\" === this.method) {\n          try {\n            if (this.isBinary) {\n              xhr.setRequestHeader(\"Content-type\", \"application/octet-stream\");\n            } else {\n              xhr.setRequestHeader(\"Content-type\", \"text/plain;charset=UTF-8\");\n            }\n          } catch (e) {}\n        }\n\n        try {\n          xhr.setRequestHeader(\"Accept\", \"*/*\");\n        } catch (e) {} // ie6 check\n\n\n        if (\"withCredentials\" in xhr) {\n          xhr.withCredentials = this.opts.withCredentials;\n        }\n\n        if (this.opts.requestTimeout) {\n          xhr.timeout = this.opts.requestTimeout;\n        }\n\n        if (this.hasXDR()) {\n          xhr.onload = function () {\n            self.onLoad();\n          };\n\n          xhr.onerror = function () {\n            self.onError(xhr.responseText);\n          };\n        } else {\n          xhr.onreadystatechange = function () {\n            if (xhr.readyState === 2) {\n              try {\n                var contentType = xhr.getResponseHeader(\"Content-Type\");\n\n                if (self.supportsBinary && contentType === \"application/octet-stream\" || contentType === \"application/octet-stream; charset=UTF-8\") {\n                  xhr.responseType = \"arraybuffer\";\n                }\n              } catch (e) {}\n            }\n\n            if (4 !== xhr.readyState) return;\n\n            if (200 === xhr.status || 1223 === xhr.status) {\n              self.onLoad();\n            } else {\n              // make sure the `error` event handler that's user-set\n              // does not throw in the same tick and gets caught here\n              setTimeout(function () {\n                self.onError(typeof xhr.status === \"number\" ? xhr.status : 0);\n              }, 0);\n            }\n          };\n        }\n\n        debug(\"xhr data %s\", this.data);\n        xhr.send(this.data);\n      } catch (e) {\n        // Need to defer since .create() is called directly from the constructor\n        // and thus the 'error' event can only be only bound *after* this exception\n        // occurs.  Therefore, also, we cannot throw here at all.\n        setTimeout(function () {\n          self.onError(e);\n        }, 0);\n        return;\n      }\n\n      if (typeof document !== \"undefined\") {\n        this.index = Request.requestsCount++;\n        Request.requests[this.index] = this;\n      }\n    }\n    /**\n     * Called upon successful response.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onSuccess\",\n    value: function onSuccess() {\n      this.emit(\"success\");\n      this.cleanup();\n    }\n    /**\n     * Called if we have data.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onData\",\n    value: function onData(data) {\n      this.emit(\"data\", data);\n      this.onSuccess();\n    }\n    /**\n     * Called upon error.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onError\",\n    value: function onError(err) {\n      this.emit(\"error\", err);\n      this.cleanup(true);\n    }\n    /**\n     * Cleans up house.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"cleanup\",\n    value: function cleanup(fromError) {\n      if (\"undefined\" === typeof this.xhr || null === this.xhr) {\n        return;\n      } // xmlhttprequest\n\n\n      if (this.hasXDR()) {\n        this.xhr.onload = this.xhr.onerror = empty;\n      } else {\n        this.xhr.onreadystatechange = empty;\n      }\n\n      if (fromError) {\n        try {\n          this.xhr.abort();\n        } catch (e) {}\n      }\n\n      if (typeof document !== \"undefined\") {\n        delete Request.requests[this.index];\n      }\n\n      this.xhr = null;\n    }\n    /**\n     * Called upon load.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onLoad\",\n    value: function onLoad() {\n      var data = this.xhr.responseText;\n\n      if (data !== null) {\n        this.onData(data);\n      }\n    }\n    /**\n     * Check if it has XDomainRequest.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"hasXDR\",\n    value: function hasXDR() {\n      return typeof XDomainRequest !== \"undefined\" && !this.xs && this.enablesXDR;\n    }\n    /**\n     * Aborts the request.\n     *\n     * @api public\n     */\n\n  }, {\n    key: \"abort\",\n    value: function abort() {\n      this.cleanup();\n    }\n  }]);\n\n  return Request;\n}(Emitter);\n/**\n * Aborts pending requests when unloading the window. This is needed to prevent\n * memory leaks (e.g. when using IE) and to ensure that no spurious error is\n * emitted.\n */\n\n\nRequest.requestsCount = 0;\nRequest.requests = {};\n\nif (typeof document !== \"undefined\") {\n  if (typeof attachEvent === \"function\") {\n    attachEvent(\"onunload\", unloadHandler);\n  } else if (typeof addEventListener === \"function\") {\n    var terminationEvent = \"onpagehide\" in globalThis ? \"pagehide\" : \"unload\";\n    addEventListener(terminationEvent, unloadHandler, false);\n  }\n}\n\nfunction unloadHandler() {\n  for (var i in Request.requests) {\n    if (Request.requests.hasOwnProperty(i)) {\n      Request.requests[i].abort();\n    }\n  }\n}\n\nmodule.exports = XHR;\nmodule.exports.Request = Request;\n\n//# sourceURL=webpack://eio/./lib/transports/polling-xhr.js?");
 
 /***/ }),
 
diff --git a/dist/engine.io.min.js b/dist/engine.io.min.js
index 103b3f02a..a314d3617 100644
--- a/dist/engine.io.min.js
+++ b/dist/engine.io.min.js
@@ -1,6 +1,6 @@
 /*!
- * Engine.IO v4.0.1
+ * Engine.IO v4.0.2
  * (c) 2014-2020 Guillermo Rauch
  * Released under the MIT License.
  */
-!function(t,e){"object"==typeof exports&&"object"==typeof module?module.exports=e():"function"==typeof define&&define.amd?define([],e):"object"==typeof exports?exports.eio=e():t.eio=e()}("undefined"!=typeof self?self:"undefined"!=typeof window?window:"undefined"!=typeof global?global:Function("return this")(),(function(){return function(t){var e={};function r(n){if(e[n])return e[n].exports;var o=e[n]={i:n,l:!1,exports:{}};return t[n].call(o.exports,o,o.exports,r),o.l=!0,o.exports}return r.m=t,r.c=e,r.d=function(t,e,n){r.o(t,e)||Object.defineProperty(t,e,{enumerable:!0,get:n})},r.r=function(t){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(t,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(t,"__esModule",{value:!0})},r.t=function(t,e){if(1&e&&(t=r(t)),8&e)return t;if(4&e&&"object"==typeof t&&t&&t.__esModule)return t;var n=Object.create(null);if(r.r(n),Object.defineProperty(n,"default",{enumerable:!0,value:t}),2&e&&"string"!=typeof t)for(var o in 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diff --git a/package-lock.json b/package-lock.json
index de982f13b..cc5203a29 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "engine.io-client",
-  "version": "4.0.1",
+  "version": "4.0.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index aa95f8c20..259f472ea 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "engine.io-client",
   "description": "Client for the realtime Engine",
   "license": "MIT",
-  "version": "4.0.1",
+  "version": "4.0.2",
   "main": "lib/index.js",
   "homepage": "https://github.com/socketio/engine.io-client",
   "contributors": [