From 276597f92d9aa570a07a7294314b45761aef9c35 Mon Sep 17 00:00:00 2001
From: Damien Arrachequesne <damien.arrachequesne@gmail.com>
Date: Thu, 22 Oct 2020 00:31:35 +0200
Subject: [PATCH] chore(release): 4.0.1

Diff: https://github.com/socketio/engine.io-client/compare/4.0.0...4.0.1
---
 CHANGELOG.md          | 4 ++++
 dist/engine.io.js     | 6 +++---
 dist/engine.io.min.js | 4 ++--
 package-lock.json     | 2 +-
 package.json          | 2 +-
 5 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 129b5dea6..4e93f51c1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## [4.0.1](https://github.com/socketio/engine.io-client/compare/4.0.0...4.0.1) (2020-10-21)
+
+
+
 ## [3.4.4](https://github.com/socketio/engine.io-client/compare/3.4.3...3.4.4) (2020-09-30)
 
 
diff --git a/dist/engine.io.js b/dist/engine.io.js
index 0f82f47ad..0aab8b54d 100644
--- a/dist/engine.io.js
+++ b/dist/engine.io.js
@@ -1,5 +1,5 @@
 /*!
- * Engine.IO v4.0.0
+ * Engine.IO v4.0.1
  * (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 fhrom 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 ? 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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?");
 
 /***/ }),
 
@@ -371,7 +371,7 @@ eval("/**\n * Compiles a querystring\n * Returns string representation of the ob
 /*! no static exports found */
 /***/ (function(module, exports) {
 
-eval("/**\r\n * Parses an URI\r\n *\r\n * @author Steven Levithan <stevenlevithan.com> (MIT license)\r\n * @api private\r\n */\nvar re = /^(?:(?![^:@]+:[^:@\\/]*@)(http|https|ws|wss):\\/\\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\\/?#]*)(?::(\\d*))?)(((\\/(?:[^?#](?![^?#\\/]*\\.[^?#\\/.]+(?:[?#]|$)))*\\/?)?([^?#\\/]*))(?:\\?([^#]*))?(?:#(.*))?)/;\nvar parts = ['source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host', 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'];\n\nmodule.exports = function parseuri(str) {\n  var src = str,\n      b = str.indexOf('['),\n      e = str.indexOf(']');\n\n  if (b != -1 && e != -1) {\n    str = str.substring(0, b) + str.substring(b, e).replace(/:/g, ';') + str.substring(e, str.length);\n  }\n\n  var m = re.exec(str || ''),\n      uri = {},\n      i = 14;\n\n  while (i--) {\n    uri[parts[i]] = m[i] || '';\n  }\n\n  if (b != -1 && e != -1) {\n    uri.source = src;\n    uri.host = uri.host.substring(1, uri.host.length - 1).replace(/;/g, ':');\n    uri.authority = uri.authority.replace('[', '').replace(']', '').replace(/;/g, ':');\n    uri.ipv6uri = true;\n  }\n\n  return uri;\n};\n\n//# sourceURL=webpack://eio/./node_modules/parseuri/index.js?");
+eval("/**\n * Parses an URI\n *\n * @author Steven Levithan <stevenlevithan.com> (MIT license)\n * @api private\n */\nvar re = /^(?:(?![^:@]+:[^:@\\/]*@)(http|https|ws|wss):\\/\\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\\/?#]*)(?::(\\d*))?)(((\\/(?:[^?#](?![^?#\\/]*\\.[^?#\\/.]+(?:[?#]|$)))*\\/?)?([^?#\\/]*))(?:\\?([^#]*))?(?:#(.*))?)/;\nvar parts = ['source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host', 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'];\n\nmodule.exports = function parseuri(str) {\n  var src = str,\n      b = str.indexOf('['),\n      e = str.indexOf(']');\n\n  if (b != -1 && e != -1) {\n    str = str.substring(0, b) + str.substring(b, e).replace(/:/g, ';') + str.substring(e, str.length);\n  }\n\n  var m = re.exec(str || ''),\n      uri = {},\n      i = 14;\n\n  while (i--) {\n    uri[parts[i]] = m[i] || '';\n  }\n\n  if (b != -1 && e != -1) {\n    uri.source = src;\n    uri.host = uri.host.substring(1, uri.host.length - 1).replace(/;/g, ':');\n    uri.authority = uri.authority.replace('[', '').replace(']', '').replace(/;/g, ':');\n    uri.ipv6uri = true;\n  }\n\n  uri.pathNames = pathNames(uri, uri['path']);\n  uri.queryKey = queryKey(uri, uri['query']);\n  return uri;\n};\n\nfunction pathNames(obj, path) {\n  var regx = /\\/{2,9}/g,\n      names = path.replace(regx, \"/\").split(\"/\");\n\n  if (path.substr(0, 1) == '/' || path.length === 0) {\n    names.splice(0, 1);\n  }\n\n  if (path.substr(path.length - 1, 1) == '/') {\n    names.splice(names.length - 1, 1);\n  }\n\n  return names;\n}\n\nfunction queryKey(uri, query) {\n  var data = {};\n  query.replace(/(?:^|&)([^&=]*)=?([^&]*)/g, function ($0, $1, $2) {\n    if ($1) {\n      data[$1] = $2;\n    }\n  });\n  return data;\n}\n\n//# sourceURL=webpack://eio/./node_modules/parseuri/index.js?");
 
 /***/ }),
 
diff --git a/dist/engine.io.min.js b/dist/engine.io.min.js
index 52064a53a..103b3f02a 100644
--- a/dist/engine.io.min.js
+++ b/dist/engine.io.min.js
@@ -1,6 +1,6 @@
 /*!
- * Engine.IO v4.0.0
+ * Engine.IO v4.0.1
  * (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 t)r.d(n,o,function(e){return t[e]}.bind(null,o));return n},r.n=function(t){var e=t&&t.__esModule?function(){return t.default}:function(){return t};return r.d(e,"a",e),e},r.o=function(t,e){return Object.prototype.hasOwnProperty.call(t,e)},r.p="",r(r.s=11)}([function(t,e,r){var n=r(15),o=r(16),i=String.fromCharCode(30);t.exports={protocol:4,encodePacket:n,encodePayload:function(t,e){var r=t.length,o=new Array(r),s=0;t.forEach((function(t,a){n(t,!1,(function(t){o[a]=t,++s===r&&e(o.join(i))}))}))},decodePacket:o,decodePayload:function(t,e){for(var r=t.split(i),n=[],s=0;s<r.length;s++){var a=o(r[s],e);if(n.push(a),"error"===a.type)break}return n}}},function(t,e){t.exports="undefined"!=typeof self?self:"undefined"!=typeof window?window:Function("return this")()},function(t,e,r){var n=r(13),o=r(1);t.exports=function(t){var e=t.xdomain,r=t.xscheme,i=t.enablesXDR;try{if("undefined"!=typeof XMLHttpRequest&&(!e||n))return new XMLHttpRequest}catch(t){}try{if("undefined"!=typeof XDomainRequest&&!r&&i)return new XDomainRequest}catch(t){}if(!e)try{return new(o[["Active"].concat("Object").join("X")])("Microsoft.XMLHTTP")}catch(t){}}},function(t,e,r){function n(t){return(n="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(t){return typeof t}:function(t){return t&&"function"==typeof Symbol&&t.constructor===Symbol&&t!==Symbol.prototype?"symbol":typeof t})(t)}function o(t,e){for(var r=0;r<e.length;r++){var n=e[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(t,n.key,n)}}function i(t,e){return!e||"object"!==n(e)&&"function"!=typeof e?function(t){if(void 0===t)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return t}(t):e}function s(t){return(s=Object.setPrototypeOf?Object.getPrototypeOf:function(t){return t.__proto__||Object.getPrototypeOf(t)})(t)}function a(t,e){return(a=Object.setPrototypeOf||function(t,e){return t.__proto__=e,t})(t,e)}var u=r(0),c=function(t){function e(t){var r;return function(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}(this,e),(r=i(this,s(e).call(this))).opts=t,r.query=t.query,r.readyState="",r.socket=t.socket,r}var r,n,c;return function(t,e){if("function"!=typeof e&&null!==e)throw new TypeError("Super expression must either be null or a function");t.prototype=Object.create(e&&e.prototype,{constructor:{value:t,writable:!0,configurable:!0}}),e&&a(t,e)}(e,t),r=e,(n=[{key:"onError",value:function(t,e){var r=new Error(t);return r.type="TransportError",r.description=e,this.emit("error",r),this}},{key:"open",value:function(){return"closed"!==this.readyState&&""!==this.readyState||(this.readyState="opening",this.doOpen()),this}},{key:"close",value:function(){return"opening"!==this.readyState&&"open"!==this.readyState||(this.doClose(),this.onClose()),this}},{key:"send",value:function(t){if("open"!==this.readyState)throw new Error("Transport not open");this.write(t)}},{key:"onOpen",value:function(){this.readyState="open",this.writable=!0,this.emit("open")}},{key:"onData",value:function(t){var e=u.decodePacket(t,this.socket.binaryType);this.onPacket(e)}},{key:"onPacket",value:function(t){this.emit("packet",t)}},{key:"onClose",value:function(){this.readyState="closed",this.emit("close")}}])&&o(r.prototype,n),c&&o(r,c),e}(r(4));t.exports=c},function(t,e,r){function n(t){if(t)return function(t){for(var e in n.prototype)t[e]=n.prototype[e];return t}(t)}t.exports=n,n.prototype.on=n.prototype.addEventListener=function(t,e){return this._callbacks=this._callbacks||{},(this._callbacks["$"+t]=this._callbacks["$"+t]||[]).push(e),this},n.prototype.once=function(t,e){function r(){this.off(t,r),e.apply(this,arguments)}return r.fn=e,this.on(t,r),this},n.prototype.off=n.prototype.removeListener=n.prototype.removeAllListeners=n.prototype.removeEventListener=function(t,e){if(this._callbacks=this._callbacks||{},0==arguments.length)return 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n&&(n.writable=!0),Object.defineProperty(t,n.key,n)}}function s(t,e){return!e||"object"!==n(e)&&"function"!=typeof e?function(t){if(void 0===t)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return t}(t):e}function a(t){return(a=Object.setPrototypeOf?Object.getPrototypeOf:function(t){return t.__proto__||Object.getPrototypeOf(t)})(t)}function u(t,e){return(u=Object.setPrototypeOf||function(t,e){return t.__proto__=e,t})(t,e)}var c=r(3),p=r(5),f=r(0),l=r(9),h=function(t){function e(){return o(this,e),s(this,a(e).apply(this,arguments))}var r,n,c;return function(t,e){if("function"!=typeof e&&null!==e)throw new TypeError("Super expression must either be null or a function");t.prototype=Object.create(e&&e.prototype,{constructor:{value:t,writable:!0,configurable:!0}}),e&&u(t,e)}(e,t),r=e,(n=[{key:"doOpen",value:function(){this.poll()}},{key:"pause",value:function(t){var e=this;function 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diff --git a/package-lock.json b/package-lock.json
index cb438e4b7..5c7bf8294 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "engine.io-client",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index c22cc35f9..2a2d409a2 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "engine.io-client",
   "description": "Client for the realtime Engine",
   "license": "MIT",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "main": "lib/index.js",
   "homepage": "https://github.com/socketio/engine.io-client",
   "contributors": [