sockjs.js

/* sockjs-client v1.6.1 | http://sockjs.org | MIT license */
(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.SockJS = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
(function (global){(function (){
'use strict';

var transportList = require('./transport-list');

module.exports = require('./main')(transportList);

// TODO can't get rid of this until all servers do
if ('_sockjs_onload' in global) {
  setTimeout(global._sockjs_onload, 1);
}

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{"./main":14,"./transport-list":16}],2:[function(require,module,exports){
'use strict';

var inherits = require('inherits')
  , Event = require('./event')
  ;

function CloseEvent() {
  Event.call(this);
  this.initEvent('close', false, false);
  this.wasClean = false;
  this.code = 0;
  this.reason = '';
}

inherits(CloseEvent, Event);

module.exports = CloseEvent;

},{"./event":4,"inherits":57}],3:[function(require,module,exports){
'use strict';

var inherits = require('inherits')
  , EventTarget = require('./eventtarget')
  ;

function EventEmitter() {
  EventTarget.call(this);
}

inherits(EventEmitter, EventTarget);

EventEmitter.prototype.removeAllListeners = function(type) {
  if (type) {
    delete this._listeners[type];
  } else {
    this._listeners = {};
  }
};

EventEmitter.prototype.once = function(type, listener) {
  var self = this
    , fired = false;

  function g() {
    self.removeListener(type, g);

    if (!fired) {
      fired = true;
      listener.apply(this, arguments);
    }
  }

  this.on(type, g);
};

EventEmitter.prototype.emit = function() {
  var type = arguments[0];
  var listeners = this._listeners[type];
  if (!listeners) {
    return;
  }
  // equivalent of Array.prototype.slice.call(arguments, 1);
  var l = arguments.length;
  var args = new Array(l - 1);
  for (var ai = 1; ai < l; ai++) {
    args[ai - 1] = arguments[ai];
  }
  for (var i = 0; i < listeners.length; i++) {
    listeners[i].apply(this, args);
  }
};

EventEmitter.prototype.on = EventEmitter.prototype.addListener = EventTarget.prototype.addEventListener;
EventEmitter.prototype.removeListener = EventTarget.prototype.removeEventListener;

module.exports.EventEmitter = EventEmitter;

},{"./eventtarget":5,"inherits":57}],4:[function(require,module,exports){
'use strict';

function Event(eventType) {
  this.type = eventType;
}

Event.prototype.initEvent = function(eventType, canBubble, cancelable) {
  this.type = eventType;
  this.bubbles = canBubble;
  this.cancelable = cancelable;
  this.timeStamp = +new Date();
  return this;
};

Event.prototype.stopPropagation = function() {};
Event.prototype.preventDefault = function() {};

Event.CAPTURING_PHASE = 1;
Event.AT_TARGET = 2;
Event.BUBBLING_PHASE = 3;

module.exports = Event;

},{}],5:[function(require,module,exports){
'use strict';

/* Simplified implementation of DOM2 EventTarget.
 *   http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-EventTarget
 */

function EventTarget() {
  this._listeners = {};
}

EventTarget.prototype.addEventListener = function(eventType, listener) {
  if (!(eventType in this._listeners)) {
    this._listeners[eventType] = [];
  }
  var arr = this._listeners[eventType];
  // #4
  if (arr.indexOf(listener) === -1) {
    // Make a copy so as not to interfere with a current dispatchEvent.
    arr = arr.concat([listener]);
  }
  this._listeners[eventType] = arr;
};

EventTarget.prototype.removeEventListener = function(eventType, listener) {
  var arr = this._listeners[eventType];
  if (!arr) {
    return;
  }
  var idx = arr.indexOf(listener);
  if (idx !== -1) {
    if (arr.length > 1) {
      // Make a copy so as not to interfere with a current dispatchEvent.
      this._listeners[eventType] = arr.slice(0, idx).concat(arr.slice(idx + 1));
    } else {
      delete this._listeners[eventType];
    }
    return;
  }
};

EventTarget.prototype.dispatchEvent = function() {
  var event = arguments[0];
  var t = event.type;
  // equivalent of Array.prototype.slice.call(arguments, 0);
  var args = arguments.length === 1 ? [event] : Array.apply(null, arguments);
  // TODO: This doesn't match the real behavior; per spec, onfoo get
  // their place in line from the /first/ time they're set from
  // non-null. Although WebKit bumps it to the end every time it's
  // set.
  if (this['on' + t]) {
    this['on' + t].apply(this, args);
  }
  if (t in this._listeners) {
    // Grab a reference to the listeners list. removeEventListener may alter the list.
    var listeners = this._listeners[t];
    for (var i = 0; i < listeners.length; i++) {
      listeners[i].apply(this, args);
    }
  }
};

module.exports = EventTarget;

},{}],6:[function(require,module,exports){
'use strict';

var inherits = require('inherits')
  , Event = require('./event')
  ;

function TransportMessageEvent(data) {
  Event.call(this);
  this.initEvent('message', false, false);
  this.data = data;
}

inherits(TransportMessageEvent, Event);

module.exports = TransportMessageEvent;

},{"./event":4,"inherits":57}],7:[function(require,module,exports){
'use strict';

var iframeUtils = require('./utils/iframe')
  ;

function FacadeJS(transport) {
  this._transport = transport;
  transport.on('message', this._transportMessage.bind(this));
  transport.on('close', this._transportClose.bind(this));
}

FacadeJS.prototype._transportClose = function(code, reason) {
  iframeUtils.postMessage('c', JSON.stringify([code, reason]));
};
FacadeJS.prototype._transportMessage = function(frame) {
  iframeUtils.postMessage('t', frame);
};
FacadeJS.prototype._send = function(data) {
  this._transport.send(data);
};
FacadeJS.prototype._close = function() {
  this._transport.close();
  this._transport.removeAllListeners();
};

module.exports = FacadeJS;

},{"./utils/iframe":47}],8:[function(require,module,exports){
(function (process){(function (){
'use strict';

var urlUtils = require('./utils/url')
  , eventUtils = require('./utils/event')
  , FacadeJS = require('./facade')
  , InfoIframeReceiver = require('./info-iframe-receiver')
  , iframeUtils = require('./utils/iframe')
  , loc = require('./location')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:iframe-bootstrap');
}

module.exports = function(SockJS, availableTransports) {
  var transportMap = {};
  availableTransports.forEach(function(at) {
    if (at.facadeTransport) {
      transportMap[at.facadeTransport.transportName] = at.facadeTransport;
    }
  });

  // hard-coded for the info iframe
  // TODO see if we can make this more dynamic
  transportMap[InfoIframeReceiver.transportName] = InfoIframeReceiver;
  var parentOrigin;

  /* eslint-disable camelcase */
  SockJS.bootstrap_iframe = function() {
    /* eslint-enable camelcase */
    var facade;
    iframeUtils.currentWindowId = loc.hash.slice(1);
    var onMessage = function(e) {
      if (e.source !== parent) {
        return;
      }
      if (typeof parentOrigin === 'undefined') {
        parentOrigin = e.origin;
      }
      if (e.origin !== parentOrigin) {
        return;
      }

      var iframeMessage;
      try {
        iframeMessage = JSON.parse(e.data);
      } catch (ignored) {
        debug('bad json', e.data);
        return;
      }

      if (iframeMessage.windowId !== iframeUtils.currentWindowId) {
        return;
      }
      switch (iframeMessage.type) {
      case 's':
        var p;
        try {
          p = JSON.parse(iframeMessage.data);
        } catch (ignored) {
          debug('bad json', iframeMessage.data);
          break;
        }
        var version = p[0];
        var transport = p[1];
        var transUrl = p[2];
        var baseUrl = p[3];
        debug(version, transport, transUrl, baseUrl);
        // change this to semver logic
        if (version !== SockJS.version) {
          throw new Error('Incompatible SockJS! Main site uses:' +
                    ' "' + version + '", the iframe:' +
                    ' "' + SockJS.version + '".');
        }

        if (!urlUtils.isOriginEqual(transUrl, loc.href) ||
            !urlUtils.isOriginEqual(baseUrl, loc.href)) {
          throw new Error('Can\'t connect to different domain from within an ' +
                    'iframe. (' + loc.href + ', ' + transUrl + ', ' + baseUrl + ')');
        }
        facade = new FacadeJS(new transportMap[transport](transUrl, baseUrl));
        break;
      case 'm':
        facade._send(iframeMessage.data);
        break;
      case 'c':
        if (facade) {
          facade._close();
        }
        facade = null;
        break;
      }
    };

    eventUtils.attachEvent('message', onMessage);

    // Start
    iframeUtils.postMessage('s');
  };
};

}).call(this)}).call(this,{ env: {} })

},{"./facade":7,"./info-iframe-receiver":10,"./location":13,"./utils/event":46,"./utils/iframe":47,"./utils/url":52,"debug":55}],9:[function(require,module,exports){
(function (process){(function (){
'use strict';

var EventEmitter = require('events').EventEmitter
  , inherits = require('inherits')
  , objectUtils = require('./utils/object')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:info-ajax');
}

function InfoAjax(url, AjaxObject) {
  EventEmitter.call(this);

  var self = this;
  var t0 = +new Date();
  this.xo = new AjaxObject('GET', url);

  this.xo.once('finish', function(status, text) {
    var info, rtt;
    if (status === 200) {
      rtt = (+new Date()) - t0;
      if (text) {
        try {
          info = JSON.parse(text);
        } catch (e) {
          debug('bad json', text);
        }
      }

      if (!objectUtils.isObject(info)) {
        info = {};
      }
    }
    self.emit('finish', info, rtt);
    self.removeAllListeners();
  });
}

inherits(InfoAjax, EventEmitter);

InfoAjax.prototype.close = function() {
  this.removeAllListeners();
  this.xo.close();
};

module.exports = InfoAjax;

}).call(this)}).call(this,{ env: {} })

},{"./utils/object":49,"debug":55,"events":3,"inherits":57}],10:[function(require,module,exports){
'use strict';

var inherits = require('inherits')
  , EventEmitter = require('events').EventEmitter
  , XHRLocalObject = require('./transport/sender/xhr-local')
  , InfoAjax = require('./info-ajax')
  ;

function InfoReceiverIframe(transUrl) {
  var self = this;
  EventEmitter.call(this);

  this.ir = new InfoAjax(transUrl, XHRLocalObject);
  this.ir.once('finish', function(info, rtt) {
    self.ir = null;
    self.emit('message', JSON.stringify([info, rtt]));
  });
}

inherits(InfoReceiverIframe, EventEmitter);

InfoReceiverIframe.transportName = 'iframe-info-receiver';

InfoReceiverIframe.prototype.close = function() {
  if (this.ir) {
    this.ir.close();
    this.ir = null;
  }
  this.removeAllListeners();
};

module.exports = InfoReceiverIframe;

},{"./info-ajax":9,"./transport/sender/xhr-local":37,"events":3,"inherits":57}],11:[function(require,module,exports){
(function (process,global){(function (){
'use strict';

var EventEmitter = require('events').EventEmitter
  , inherits = require('inherits')
  , utils = require('./utils/event')
  , IframeTransport = require('./transport/iframe')
  , InfoReceiverIframe = require('./info-iframe-receiver')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:info-iframe');
}

function InfoIframe(baseUrl, url) {
  var self = this;
  EventEmitter.call(this);

  var go = function() {
    var ifr = self.ifr = new IframeTransport(InfoReceiverIframe.transportName, url, baseUrl);

    ifr.once('message', function(msg) {
      if (msg) {
        var d;
        try {
          d = JSON.parse(msg);
        } catch (e) {
          debug('bad json', msg);
          self.emit('finish');
          self.close();
          return;
        }

        var info = d[0], rtt = d[1];
        self.emit('finish', info, rtt);
      }
      self.close();
    });

    ifr.once('close', function() {
      self.emit('finish');
      self.close();
    });
  };

  // TODO this seems the same as the 'needBody' from transports
  if (!global.document.body) {
    utils.attachEvent('load', go);
  } else {
    go();
  }
}

inherits(InfoIframe, EventEmitter);

InfoIframe.enabled = function() {
  return IframeTransport.enabled();
};

InfoIframe.prototype.close = function() {
  if (this.ifr) {
    this.ifr.close();
  }
  this.removeAllListeners();
  this.ifr = null;
};

module.exports = InfoIframe;

}).call(this)}).call(this,{ env: {} },typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{"./info-iframe-receiver":10,"./transport/iframe":22,"./utils/event":46,"debug":55,"events":3,"inherits":57}],12:[function(require,module,exports){
(function (process){(function (){
'use strict';

var EventEmitter = require('events').EventEmitter
  , inherits = require('inherits')
  , urlUtils = require('./utils/url')
  , XDR = require('./transport/sender/xdr')
  , XHRCors = require('./transport/sender/xhr-cors')
  , XHRLocal = require('./transport/sender/xhr-local')
  , XHRFake = require('./transport/sender/xhr-fake')
  , InfoIframe = require('./info-iframe')
  , InfoAjax = require('./info-ajax')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:info-receiver');
}

function InfoReceiver(baseUrl, urlInfo) {
  debug(baseUrl);
  var self = this;
  EventEmitter.call(this);

  setTimeout(function() {
    self.doXhr(baseUrl, urlInfo);
  }, 0);
}

inherits(InfoReceiver, EventEmitter);

// TODO this is currently ignoring the list of available transports and the whitelist

InfoReceiver._getReceiver = function(baseUrl, url, urlInfo) {
  // determine method of CORS support (if needed)
  if (urlInfo.sameOrigin) {
    return new InfoAjax(url, XHRLocal);
  }
  if (XHRCors.enabled) {
    return new InfoAjax(url, XHRCors);
  }
  if (XDR.enabled && urlInfo.sameScheme) {
    return new InfoAjax(url, XDR);
  }
  if (InfoIframe.enabled()) {
    return new InfoIframe(baseUrl, url);
  }
  return new InfoAjax(url, XHRFake);
};

InfoReceiver.prototype.doXhr = function(baseUrl, urlInfo) {
  var self = this
    , url = urlUtils.addPath(baseUrl, '/info')
    ;
  debug('doXhr', url);

  this.xo = InfoReceiver._getReceiver(baseUrl, url, urlInfo);

  this.timeoutRef = setTimeout(function() {
    debug('timeout');
    self._cleanup(false);
    self.emit('finish');
  }, InfoReceiver.timeout);

  this.xo.once('finish', function(info, rtt) {
    debug('finish', info, rtt);
    self._cleanup(true);
    self.emit('finish', info, rtt);
  });
};

InfoReceiver.prototype._cleanup = function(wasClean) {
  debug('_cleanup');
  clearTimeout(this.timeoutRef);
  this.timeoutRef = null;
  if (!wasClean && this.xo) {
    this.xo.close();
  }
  this.xo = null;
};

InfoReceiver.prototype.close = function() {
  debug('close');
  this.removeAllListeners();
  this._cleanup(false);
};

InfoReceiver.timeout = 8000;

module.exports = InfoReceiver;

}).call(this)}).call(this,{ env: {} })

},{"./info-ajax":9,"./info-iframe":11,"./transport/sender/xdr":34,"./transport/sender/xhr-cors":35,"./transport/sender/xhr-fake":36,"./transport/sender/xhr-local":37,"./utils/url":52,"debug":55,"events":3,"inherits":57}],13:[function(require,module,exports){
(function (global){(function (){
'use strict';

module.exports = global.location || {
  origin: 'http://localhost:80'
, protocol: 'http:'
, host: 'localhost'
, port: 80
, href: 'http://localhost/'
, hash: ''
};

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{}],14:[function(require,module,exports){
(function (process,global){(function (){
'use strict';

require('./shims');

var URL = require('url-parse')
  , inherits = require('inherits')
  , random = require('./utils/random')
  , escape = require('./utils/escape')
  , urlUtils = require('./utils/url')
  , eventUtils = require('./utils/event')
  , transport = require('./utils/transport')
  , objectUtils = require('./utils/object')
  , browser = require('./utils/browser')
  , log = require('./utils/log')
  , Event = require('./event/event')
  , EventTarget = require('./event/eventtarget')
  , loc = require('./location')
  , CloseEvent = require('./event/close')
  , TransportMessageEvent = require('./event/trans-message')
  , InfoReceiver = require('./info-receiver')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:main');
}

var transports;

// follow constructor steps defined at http://dev.w3.org/html5/websockets/#the-websocket-interface
function SockJS(url, protocols, options) {
  if (!(this instanceof SockJS)) {
    return new SockJS(url, protocols, options);
  }
  if (arguments.length < 1) {
    throw new TypeError("Failed to construct 'SockJS: 1 argument required, but only 0 present");
  }
  EventTarget.call(this);

  this.readyState = SockJS.CONNECTING;
  this.extensions = '';
  this.protocol = '';

  // non-standard extension
  options = options || {};
  if (options.protocols_whitelist) {
    log.warn("'protocols_whitelist' is DEPRECATED. Use 'transports' instead.");
  }
  this._transportsWhitelist = options.transports;
  this._transportOptions = options.transportOptions || {};
  this._timeout = options.timeout || 0;

  var sessionId = options.sessionId || 8;
  if (typeof sessionId === 'function') {
    this._generateSessionId = sessionId;
  } else if (typeof sessionId === 'number') {
    this._generateSessionId = function() {
      return random.string(sessionId);
    };
  } else {
    throw new TypeError('If sessionId is used in the options, it needs to be a number or a function.');
  }

  this._server = options.server || random.numberString(1000);

  // Step 1 of WS spec - parse and validate the url. Issue #8
  var parsedUrl = new URL(url);
  if (!parsedUrl.host || !parsedUrl.protocol) {
    throw new SyntaxError("The URL '" + url + "' is invalid");
  } else if (parsedUrl.hash) {
    throw new SyntaxError('The URL must not contain a fragment');
  } else if (parsedUrl.protocol !== 'http:' && parsedUrl.protocol !== 'https:') {
    throw new SyntaxError("The URL's scheme must be either 'http:' or 'https:'. '" + parsedUrl.protocol + "' is not allowed.");
  }

  var secure = parsedUrl.protocol === 'https:';
  // Step 2 - don't allow secure origin with an insecure protocol
  if (loc.protocol === 'https:' && !secure) {
    // exception is 127.0.0.0/8 and ::1 urls
    if (!urlUtils.isLoopbackAddr(parsedUrl.hostname)) {
      throw new Error('SecurityError: An insecure SockJS connection may not be initiated from a page loaded over HTTPS');
    }
  }

  // Step 3 - check port access - no need here
  // Step 4 - parse protocols argument
  if (!protocols) {
    protocols = [];
  } else if (!Array.isArray(protocols)) {
    protocols = [protocols];
  }

  // Step 5 - check protocols argument
  var sortedProtocols = protocols.sort();
  sortedProtocols.forEach(function(proto, i) {
    if (!proto) {
      throw new SyntaxError("The protocols entry '" + proto + "' is invalid.");
    }
    if (i < (sortedProtocols.length - 1) && proto === sortedProtocols[i + 1]) {
      throw new SyntaxError("The protocols entry '" + proto + "' is duplicated.");
    }
  });

  // Step 6 - convert origin
  var o = urlUtils.getOrigin(loc.href);
  this._origin = o ? o.toLowerCase() : null;

  // remove the trailing slash
  parsedUrl.set('pathname', parsedUrl.pathname.replace(/\/+$/, ''));

  // store the sanitized url
  this.url = parsedUrl.href;
  debug('using url', this.url);

  // Step 7 - start connection in background
  // obtain server info
  // http://sockjs.github.io/sockjs-protocol/sockjs-protocol-0.3.3.html#section-26
  this._urlInfo = {
    nullOrigin: !browser.hasDomain()
  , sameOrigin: urlUtils.isOriginEqual(this.url, loc.href)
  , sameScheme: urlUtils.isSchemeEqual(this.url, loc.href)
  };

  this._ir = new InfoReceiver(this.url, this._urlInfo);
  this._ir.once('finish', this._receiveInfo.bind(this));
}

inherits(SockJS, EventTarget);

function userSetCode(code) {
  return code === 1000 || (code >= 3000 && code <= 4999);
}

SockJS.prototype.close = function(code, reason) {
  // Step 1
  if (code && !userSetCode(code)) {
    throw new Error('InvalidAccessError: Invalid code');
  }
  // Step 2.4 states the max is 123 bytes, but we are just checking length
  if (reason && reason.length > 123) {
    throw new SyntaxError('reason argument has an invalid length');
  }

  // Step 3.1
  if (this.readyState === SockJS.CLOSING || this.readyState === SockJS.CLOSED) {
    return;
  }

  // TODO look at docs to determine how to set this
  var wasClean = true;
  this._close(code || 1000, reason || 'Normal closure', wasClean);
};

SockJS.prototype.send = function(data) {
  // #13 - convert anything non-string to string
  // TODO this currently turns objects into [object Object]
  if (typeof data !== 'string') {
    data = '' + data;
  }
  if (this.readyState === SockJS.CONNECTING) {
    throw new Error('InvalidStateError: The connection has not been established yet');
  }
  if (this.readyState !== SockJS.OPEN) {
    return;
  }
  this._transport.send(escape.quote(data));
};

SockJS.version = require('./version');

SockJS.CONNECTING = 0;
SockJS.OPEN = 1;
SockJS.CLOSING = 2;
SockJS.CLOSED = 3;

SockJS.prototype._receiveInfo = function(info, rtt) {
  debug('_receiveInfo', rtt);
  this._ir = null;
  if (!info) {
    this._close(1002, 'Cannot connect to server');
    return;
  }

  // establish a round-trip timeout (RTO) based on the
  // round-trip time (RTT)
  this._rto = this.countRTO(rtt);
  // allow server to override url used for the actual transport
  this._transUrl = info.base_url ? info.base_url : this.url;
  info = objectUtils.extend(info, this._urlInfo);
  debug('info', info);
  // determine list of desired and supported transports
  var enabledTransports = transports.filterToEnabled(this._transportsWhitelist, info);
  this._transports = enabledTransports.main;
  debug(this._transports.length + ' enabled transports');

  this._connect();
};

SockJS.prototype._connect = function() {
  for (var Transport = this._transports.shift(); Transport; Transport = this._transports.shift()) {
    debug('attempt', Transport.transportName);
    if (Transport.needBody) {
      if (!global.document.body ||
          (typeof global.document.readyState !== 'undefined' &&
            global.document.readyState !== 'complete' &&
            global.document.readyState !== 'interactive')) {
        debug('waiting for body');
        this._transports.unshift(Transport);
        eventUtils.attachEvent('load', this._connect.bind(this));
        return;
      }
    }

    // calculate timeout based on RTO and round trips. Default to 5s
    var timeoutMs = Math.max(this._timeout, (this._rto * Transport.roundTrips) || 5000);
    this._transportTimeoutId = setTimeout(this._transportTimeout.bind(this), timeoutMs);
    debug('using timeout', timeoutMs);

    var transportUrl = urlUtils.addPath(this._transUrl, '/' + this._server + '/' + this._generateSessionId());
    var options = this._transportOptions[Transport.transportName];
    debug('transport url', transportUrl);
    var transportObj = new Transport(transportUrl, this._transUrl, options);
    transportObj.on('message', this._transportMessage.bind(this));
    transportObj.once('close', this._transportClose.bind(this));
    transportObj.transportName = Transport.transportName;
    this._transport = transportObj;

    return;
  }
  this._close(2000, 'All transports failed', false);
};

SockJS.prototype._transportTimeout = function() {
  debug('_transportTimeout');
  if (this.readyState === SockJS.CONNECTING) {
    if (this._transport) {
      this._transport.close();
    }

    this._transportClose(2007, 'Transport timed out');
  }
};

SockJS.prototype._transportMessage = function(msg) {
  debug('_transportMessage', msg);
  var self = this
    , type = msg.slice(0, 1)
    , content = msg.slice(1)
    , payload
    ;

  // first check for messages that don't need a payload
  switch (type) {
    case 'o':
      this._open();
      return;
    case 'h':
      this.dispatchEvent(new Event('heartbeat'));
      debug('heartbeat', this.transport);
      return;
  }

  if (content) {
    try {
      payload = JSON.parse(content);
    } catch (e) {
      debug('bad json', content);
    }
  }

  if (typeof payload === 'undefined') {
    debug('empty payload', content);
    return;
  }

  switch (type) {
    case 'a':
      if (Array.isArray(payload)) {
        payload.forEach(function(p) {
          debug('message', self.transport, p);
          self.dispatchEvent(new TransportMessageEvent(p));
        });
      }
      break;
    case 'm':
      debug('message', this.transport, payload);
      this.dispatchEvent(new TransportMessageEvent(payload));
      break;
    case 'c':
      if (Array.isArray(payload) && payload.length === 2) {
        this._close(payload[0], payload[1], true);
      }
      break;
  }
};

SockJS.prototype._transportClose = function(code, reason) {
  debug('_transportClose', this.transport, code, reason);
  if (this._transport) {
    this._transport.removeAllListeners();
    this._transport = null;
    this.transport = null;
  }

  if (!userSetCode(code) && code !== 2000 && this.readyState === SockJS.CONNECTING) {
    this._connect();
    return;
  }

  this._close(code, reason);
};

SockJS.prototype._open = function() {
  debug('_open', this._transport && this._transport.transportName, this.readyState);
  if (this.readyState === SockJS.CONNECTING) {
    if (this._transportTimeoutId) {
      clearTimeout(this._transportTimeoutId);
      this._transportTimeoutId = null;
    }
    this.readyState = SockJS.OPEN;
    this.transport = this._transport.transportName;
    this.dispatchEvent(new Event('open'));
    debug('connected', this.transport);
  } else {
    // The server might have been restarted, and lost track of our
    // connection.
    this._close(1006, 'Server lost session');
  }
};

SockJS.prototype._close = function(code, reason, wasClean) {
  debug('_close', this.transport, code, reason, wasClean, this.readyState);
  var forceFail = false;

  if (this._ir) {
    forceFail = true;
    this._ir.close();
    this._ir = null;
  }
  if (this._transport) {
    this._transport.close();
    this._transport = null;
    this.transport = null;
  }

  if (this.readyState === SockJS.CLOSED) {
    throw new Error('InvalidStateError: SockJS has already been closed');
  }

  this.readyState = SockJS.CLOSING;
  setTimeout(function() {
    this.readyState = SockJS.CLOSED;

    if (forceFail) {
      this.dispatchEvent(new Event('error'));
    }

    var e = new CloseEvent('close');
    e.wasClean = wasClean || false;
    e.code = code || 1000;
    e.reason = reason;

    this.dispatchEvent(e);
    this.onmessage = this.onclose = this.onerror = null;
    debug('disconnected');
  }.bind(this), 0);
};

// See: http://www.erg.abdn.ac.uk/~gerrit/dccp/notes/ccid2/rto_estimator/
// and RFC 2988.
SockJS.prototype.countRTO = function(rtt) {
  // In a local environment, when using IE8/9 and the `jsonp-polling`
  // transport the time needed to establish a connection (the time that pass
  // from the opening of the transport to the call of `_dispatchOpen`) is
  // around 200msec (the lower bound used in the article above) and this
  // causes spurious timeouts. For this reason we calculate a value slightly
  // larger than that used in the article.
  if (rtt > 100) {
    return 4 * rtt; // rto > 400msec
  }
  return 300 + rtt; // 300msec < rto <= 400msec
};

module.exports = function(availableTransports) {
  transports = transport(availableTransports);
  require('./iframe-bootstrap')(SockJS, availableTransports);
  return SockJS;
};

}).call(this)}).call(this,{ env: {} },typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{"./event/close":2,"./event/event":4,"./event/eventtarget":5,"./event/trans-message":6,"./iframe-bootstrap":8,"./info-receiver":12,"./location":13,"./shims":15,"./utils/browser":44,"./utils/escape":45,"./utils/event":46,"./utils/log":48,"./utils/object":49,"./utils/random":50,"./utils/transport":51,"./utils/url":52,"./version":53,"debug":55,"inherits":57,"url-parse":60}],15:[function(require,module,exports){
/* eslint-disable */
/* jscs: disable */
'use strict';

// pulled specific shims from https://github.com/es-shims/es5-shim

var ArrayPrototype = Array.prototype;
var ObjectPrototype = Object.prototype;
var FunctionPrototype = Function.prototype;
var StringPrototype = String.prototype;
var array_slice = ArrayPrototype.slice;

var _toString = ObjectPrototype.toString;
var isFunction = function (val) {
    return ObjectPrototype.toString.call(val) === '[object Function]';
};
var isArray = function isArray(obj) {
    return _toString.call(obj) === '[object Array]';
};
var isString = function isString(obj) {
    return _toString.call(obj) === '[object String]';
};

var supportsDescriptors = Object.defineProperty && (function () {
    try {
        Object.defineProperty({}, 'x', {});
        return true;
    } catch (e) { /* this is ES3 */
        return false;
    }
}());

// Define configurable, writable and non-enumerable props
// if they don't exist.
var defineProperty;
if (supportsDescriptors) {
    defineProperty = function (object, name, method, forceAssign) {
        if (!forceAssign && (name in object)) { return; }
        Object.defineProperty(object, name, {
            configurable: true,
            enumerable: false,
            writable: true,
            value: method
        });
    };
} else {
    defineProperty = function (object, name, method, forceAssign) {
        if (!forceAssign && (name in object)) { return; }
        object[name] = method;
    };
}
var defineProperties = function (object, map, forceAssign) {
    for (var name in map) {
        if (ObjectPrototype.hasOwnProperty.call(map, name)) {
          defineProperty(object, name, map[name], forceAssign);
        }
    }
};

var toObject = function (o) {
    if (o == null) { // this matches both null and undefined
        throw new TypeError("can't convert " + o + ' to object');
    }
    return Object(o);
};

//
// Util
// ======
//

// ES5 9.4
// http://es5.github.com/#x9.4
// http://jsperf.com/to-integer

function toInteger(num) {
    var n = +num;
    if (n !== n) { // isNaN
        n = 0;
    } else if (n !== 0 && n !== (1 / 0) && n !== -(1 / 0)) {
        n = (n > 0 || -1) * Math.floor(Math.abs(n));
    }
    return n;
}

function ToUint32(x) {
    return x >>> 0;
}

//
// Function
// ========
//

// ES-5 15.3.4.5
// http://es5.github.com/#x15.3.4.5

function Empty() {}

defineProperties(FunctionPrototype, {
    bind: function bind(that) { // .length is 1
        // 1. Let Target be the this value.
        var target = this;
        // 2. If IsCallable(Target) is false, throw a TypeError exception.
        if (!isFunction(target)) {
            throw new TypeError('Function.prototype.bind called on incompatible ' + target);
        }
        // 3. Let A be a new (possibly empty) internal list of all of the
        //   argument values provided after thisArg (arg1, arg2 etc), in order.
        // XXX slicedArgs will stand in for "A" if used
        var args = array_slice.call(arguments, 1); // for normal call
        // 4. Let F be a new native ECMAScript object.
        // 11. Set the [[Prototype]] internal property of F to the standard
        //   built-in Function prototype object as specified in 15.3.3.1.
        // 12. Set the [[Call]] internal property of F as described in
        //   15.3.4.5.1.
        // 13. Set the [[Construct]] internal property of F as described in
        //   15.3.4.5.2.
        // 14. Set the [[HasInstance]] internal property of F as described in
        //   15.3.4.5.3.
        var binder = function () {

            if (this instanceof bound) {
                // 15.3.4.5.2 [[Construct]]
                // When the [[Construct]] internal method of a function object,
                // F that was created using the bind function is called with a
                // list of arguments ExtraArgs, the following steps are taken:
                // 1. Let target be the value of F's [[TargetFunction]]
                //   internal property.
                // 2. If target has no [[Construct]] internal method, a
                //   TypeError exception is thrown.
                // 3. Let boundArgs be the value of F's [[BoundArgs]] internal
                //   property.
                // 4. Let args be a new list containing the same values as the
                //   list boundArgs in the same order followed by the same
                //   values as the list ExtraArgs in the same order.
                // 5. Return the result of calling the [[Construct]] internal
                //   method of target providing args as the arguments.

                var result = target.apply(
                    this,
                    args.concat(array_slice.call(arguments))
                );
                if (Object(result) === result) {
                    return result;
                }
                return this;

            } else {
                // 15.3.4.5.1 [[Call]]
                // When the [[Call]] internal method of a function object, F,
                // which was created using the bind function is called with a
                // this value and a list of arguments ExtraArgs, the following
                // steps are taken:
                // 1. Let boundArgs be the value of F's [[BoundArgs]] internal
                //   property.
                // 2. Let boundThis be the value of F's [[BoundThis]] internal
                //   property.
                // 3. Let target be the value of F's [[TargetFunction]] internal
                //   property.
                // 4. Let args be a new list containing the same values as the
                //   list boundArgs in the same order followed by the same
                //   values as the list ExtraArgs in the same order.
                // 5. Return the result of calling the [[Call]] internal method
                //   of target providing boundThis as the this value and
                //   providing args as the arguments.

                // equiv: target.call(this, ...boundArgs, ...args)
                return target.apply(
                    that,
                    args.concat(array_slice.call(arguments))
                );

            }

        };

        // 15. If the [[Class]] internal property of Target is "Function", then
        //     a. Let L be the length property of Target minus the length of A.
        //     b. Set the length own property of F to either 0 or L, whichever is
        //       larger.
        // 16. Else set the length own property of F to 0.

        var boundLength = Math.max(0, target.length - args.length);

        // 17. Set the attributes of the length own property of F to the values
        //   specified in 15.3.5.1.
        var boundArgs = [];
        for (var i = 0; i < boundLength; i++) {
            boundArgs.push('$' + i);
        }

        // XXX Build a dynamic function with desired amount of arguments is the only
        // way to set the length property of a function.
        // In environments where Content Security Policies enabled (Chrome extensions,
        // for ex.) all use of eval or Function costructor throws an exception.
        // However in all of these environments Function.prototype.bind exists
        // and so this code will never be executed.
        var bound = Function('binder', 'return function (' + boundArgs.join(',') + '){ return binder.apply(this, arguments); }')(binder);

        if (target.prototype) {
            Empty.prototype = target.prototype;
            bound.prototype = new Empty();
            // Clean up dangling references.
            Empty.prototype = null;
        }

        // TODO
        // 18. Set the [[Extensible]] internal property of F to true.

        // TODO
        // 19. Let thrower be the [[ThrowTypeError]] function Object (13.2.3).
        // 20. Call the [[DefineOwnProperty]] internal method of F with
        //   arguments "caller", PropertyDescriptor {[[Get]]: thrower, [[Set]]:
        //   thrower, [[Enumerable]]: false, [[Configurable]]: false}, and
        //   false.
        // 21. Call the [[DefineOwnProperty]] internal method of F with
        //   arguments "arguments", PropertyDescriptor {[[Get]]: thrower,
        //   [[Set]]: thrower, [[Enumerable]]: false, [[Configurable]]: false},
        //   and false.

        // TODO
        // NOTE Function objects created using Function.prototype.bind do not
        // have a prototype property or the [[Code]], [[FormalParameters]], and
        // [[Scope]] internal properties.
        // XXX can't delete prototype in pure-js.

        // 22. Return F.
        return bound;
    }
});

//
// Array
// =====
//

// ES5 15.4.3.2
// http://es5.github.com/#x15.4.3.2
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/isArray
defineProperties(Array, { isArray: isArray });


var boxedString = Object('a');
var splitString = boxedString[0] !== 'a' || !(0 in boxedString);

var properlyBoxesContext = function properlyBoxed(method) {
    // Check node 0.6.21 bug where third parameter is not boxed
    var properlyBoxesNonStrict = true;
    var properlyBoxesStrict = true;
    if (method) {
        method.call('foo', function (_, __, context) {
            if (typeof context !== 'object') { properlyBoxesNonStrict = false; }
        });

        method.call([1], function () {
            'use strict';
            properlyBoxesStrict = typeof this === 'string';
        }, 'x');
    }
    return !!method && properlyBoxesNonStrict && properlyBoxesStrict;
};

defineProperties(ArrayPrototype, {
    forEach: function forEach(fun /*, thisp*/) {
        var object = toObject(this),
            self = splitString && isString(this) ? this.split('') : object,
            thisp = arguments[1],
            i = -1,
            length = self.length >>> 0;

        // If no callback function or if callback is not a callable function
        if (!isFunction(fun)) {
            throw new TypeError(); // TODO message
        }

        while (++i < length) {
            if (i in self) {
                // Invoke the callback function with call, passing arguments:
                // context, property value, property key, thisArg object
                // context
                fun.call(thisp, self[i], i, object);
            }
        }
    }
}, !properlyBoxesContext(ArrayPrototype.forEach));

// ES5 15.4.4.14
// http://es5.github.com/#x15.4.4.14
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf
var hasFirefox2IndexOfBug = Array.prototype.indexOf && [0, 1].indexOf(1, 2) !== -1;
defineProperties(ArrayPrototype, {
    indexOf: function indexOf(sought /*, fromIndex */ ) {
        var self = splitString && isString(this) ? this.split('') : toObject(this),
            length = self.length >>> 0;

        if (!length) {
            return -1;
        }

        var i = 0;
        if (arguments.length > 1) {
            i = toInteger(arguments[1]);
        }

        // handle negative indices
        i = i >= 0 ? i : Math.max(0, length + i);
        for (; i < length; i++) {
            if (i in self && self[i] === sought) {
                return i;
            }
        }
        return -1;
    }
}, hasFirefox2IndexOfBug);

//
// String
// ======
//

// ES5 15.5.4.14
// http://es5.github.com/#x15.5.4.14

// [bugfix, IE lt 9, firefox 4, Konqueror, Opera, obscure browsers]
// Many browsers do not split properly with regular expressions or they
// do not perform the split correctly under obscure conditions.
// See http://blog.stevenlevithan.com/archives/cross-browser-split
// I've tested in many browsers and this seems to cover the deviant ones:
//    'ab'.split(/(?:ab)*/) should be ["", ""], not [""]
//    '.'.split(/(.?)(.?)/) should be ["", ".", "", ""], not ["", ""]
//    'tesst'.split(/(s)*/) should be ["t", undefined, "e", "s", "t"], not
//       [undefined, "t", undefined, "e", ...]
//    ''.split(/.?/) should be [], not [""]
//    '.'.split(/()()/) should be ["."], not ["", "", "."]

var string_split = StringPrototype.split;
if (
    'ab'.split(/(?:ab)*/).length !== 2 ||
    '.'.split(/(.?)(.?)/).length !== 4 ||
    'tesst'.split(/(s)*/)[1] === 't' ||
    'test'.split(/(?:)/, -1).length !== 4 ||
    ''.split(/.?/).length ||
    '.'.split(/()()/).length > 1
) {
    (function () {
        var compliantExecNpcg = /()??/.exec('')[1] === void 0; // NPCG: nonparticipating capturing group

        StringPrototype.split = function (separator, limit) {
            var string = this;
            if (separator === void 0 && limit === 0) {
                return [];
            }

            // If `separator` is not a regex, use native split
            if (_toString.call(separator) !== '[object RegExp]') {
                return string_split.call(this, separator, limit);
            }

            var output = [],
                flags = (separator.ignoreCase ? 'i' : '') +
                        (separator.multiline  ? 'm' : '') +
                        (separator.extended   ? 'x' : '') + // Proposed for ES6
                        (separator.sticky     ? 'y' : ''), // Firefox 3+
                lastLastIndex = 0,
                // Make `global` and avoid `lastIndex` issues by working with a copy
                separator2, match, lastIndex, lastLength;
            separator = new RegExp(separator.source, flags + 'g');
            string += ''; // Type-convert
            if (!compliantExecNpcg) {
                // Doesn't need flags gy, but they don't hurt
                separator2 = new RegExp('^' + separator.source + '$(?!\\s)', flags);
            }
            /* Values for `limit`, per the spec:
             * If undefined: 4294967295 // Math.pow(2, 32) - 1
             * If 0, Infinity, or NaN: 0
             * If positive number: limit = Math.floor(limit); if (limit > 4294967295) limit -= 4294967296;
             * If negative number: 4294967296 - Math.floor(Math.abs(limit))
             * If other: Type-convert, then use the above rules
             */
            limit = limit === void 0 ?
                -1 >>> 0 : // Math.pow(2, 32) - 1
                ToUint32(limit);
            while (match = separator.exec(string)) {
                // `separator.lastIndex` is not reliable cross-browser
                lastIndex = match.index + match[0].length;
                if (lastIndex > lastLastIndex) {
                    output.push(string.slice(lastLastIndex, match.index));
                    // Fix browsers whose `exec` methods don't consistently return `undefined` for
                    // nonparticipating capturing groups
                    if (!compliantExecNpcg && match.length > 1) {
                        match[0].replace(separator2, function () {
                            for (var i = 1; i < arguments.length - 2; i++) {
                                if (arguments[i] === void 0) {
                                    match[i] = void 0;
                                }
                            }
                        });
                    }
                    if (match.length > 1 && match.index < string.length) {
                        ArrayPrototype.push.apply(output, match.slice(1));
                    }
                    lastLength = match[0].length;
                    lastLastIndex = lastIndex;
                    if (output.length >= limit) {
                        break;
                    }
                }
                if (separator.lastIndex === match.index) {
                    separator.lastIndex++; // Avoid an infinite loop
                }
            }
            if (lastLastIndex === string.length) {
                if (lastLength || !separator.test('')) {
                    output.push('');
                }
            } else {
                output.push(string.slice(lastLastIndex));
            }
            return output.length > limit ? output.slice(0, limit) : output;
        };
    }());

// [bugfix, chrome]
// If separator is undefined, then the result array contains just one String,
// which is the this value (converted to a String). If limit is not undefined,
// then the output array is truncated so that it contains no more than limit
// elements.
// "0".split(undefined, 0) -> []
} else if ('0'.split(void 0, 0).length) {
    StringPrototype.split = function split(separator, limit) {
        if (separator === void 0 && limit === 0) { return []; }
        return string_split.call(this, separator, limit);
    };
}

// ECMA-262, 3rd B.2.3
// Not an ECMAScript standard, although ECMAScript 3rd Edition has a
// non-normative section suggesting uniform semantics and it should be
// normalized across all browsers
// [bugfix, IE lt 9] IE < 9 substr() with negative value not working in IE
var string_substr = StringPrototype.substr;
var hasNegativeSubstrBug = ''.substr && '0b'.substr(-1) !== 'b';
defineProperties(StringPrototype, {
    substr: function substr(start, length) {
        return string_substr.call(
            this,
            start < 0 ? ((start = this.length + start) < 0 ? 0 : start) : start,
            length
        );
    }
}, hasNegativeSubstrBug);

},{}],16:[function(require,module,exports){
'use strict';

module.exports = [
  // streaming transports
  require('./transport/websocket')
, require('./transport/xhr-streaming')
, require('./transport/xdr-streaming')
, require('./transport/eventsource')
, require('./transport/lib/iframe-wrap')(require('./transport/eventsource'))

  // polling transports
, require('./transport/htmlfile')
, require('./transport/lib/iframe-wrap')(require('./transport/htmlfile'))
, require('./transport/xhr-polling')
, require('./transport/xdr-polling')
, require('./transport/lib/iframe-wrap')(require('./transport/xhr-polling'))
, require('./transport/jsonp-polling')
];

},{"./transport/eventsource":20,"./transport/htmlfile":21,"./transport/jsonp-polling":23,"./transport/lib/iframe-wrap":26,"./transport/websocket":38,"./transport/xdr-polling":39,"./transport/xdr-streaming":40,"./transport/xhr-polling":41,"./transport/xhr-streaming":42}],17:[function(require,module,exports){
(function (process,global){(function (){
'use strict';

var EventEmitter = require('events').EventEmitter
  , inherits = require('inherits')
  , utils = require('../../utils/event')
  , urlUtils = require('../../utils/url')
  , XHR = global.XMLHttpRequest
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:browser:xhr');
}

function AbstractXHRObject(method, url, payload, opts) {
  debug(method, url);
  var self = this;
  EventEmitter.call(this);

  setTimeout(function () {
    self._start(method, url, payload, opts);
  }, 0);
}

inherits(AbstractXHRObject, EventEmitter);

AbstractXHRObject.prototype._start = function(method, url, payload, opts) {
  var self = this;

  try {
    this.xhr = new XHR();
  } catch (x) {
    // intentionally empty
  }

  if (!this.xhr) {
    debug('no xhr');
    this.emit('finish', 0, 'no xhr support');
    this._cleanup();
    return;
  }

  // several browsers cache POSTs
  url = urlUtils.addQuery(url, 't=' + (+new Date()));

  // Explorer tends to keep connection open, even after the
  // tab gets closed: http://bugs.jquery.com/ticket/5280
  this.unloadRef = utils.unloadAdd(function() {
    debug('unload cleanup');
    self._cleanup(true);
  });
  try {
    this.xhr.open(method, url, true);
    if (this.timeout && 'timeout' in this.xhr) {
      this.xhr.timeout = this.timeout;
      this.xhr.ontimeout = function() {
        debug('xhr timeout');
        self.emit('finish', 0, '');
        self._cleanup(false);
      };
    }
  } catch (e) {
    debug('exception', e);
    // IE raises an exception on wrong port.
    this.emit('finish', 0, '');
    this._cleanup(false);
    return;
  }

  if ((!opts || !opts.noCredentials) && AbstractXHRObject.supportsCORS) {
    debug('withCredentials');
    // Mozilla docs says https://developer.mozilla.org/en/XMLHttpRequest :
    // "This never affects same-site requests."

    this.xhr.withCredentials = true;
  }
  if (opts && opts.headers) {
    for (var key in opts.headers) {
      this.xhr.setRequestHeader(key, opts.headers[key]);
    }
  }

  this.xhr.onreadystatechange = function() {
    if (self.xhr) {
      var x = self.xhr;
      var text, status;
      debug('readyState', x.readyState);
      switch (x.readyState) {
      case 3:
        // IE doesn't like peeking into responseText or status
        // on Microsoft.XMLHTTP and readystate=3
        try {
          status = x.status;
          text = x.responseText;
        } catch (e) {
          // intentionally empty
        }
        debug('status', status);
        // IE returns 1223 for 204: http://bugs.jquery.com/ticket/1450
        if (status === 1223) {
          status = 204;
        }

        // IE does return readystate == 3 for 404 answers.
        if (status === 200 && text && text.length > 0) {
          debug('chunk');
          self.emit('chunk', status, text);
        }
        break;
      case 4:
        status = x.status;
        debug('status', status);
        // IE returns 1223 for 204: http://bugs.jquery.com/ticket/1450
        if (status === 1223) {
          status = 204;
        }
        // IE returns this for a bad port
        // http://msdn.microsoft.com/en-us/library/windows/desktop/aa383770(v=vs.85).aspx
        if (status === 12005 || status === 12029) {
          status = 0;
        }

        debug('finish', status, x.responseText);
        self.emit('finish', status, x.responseText);
        self._cleanup(false);
        break;
      }
    }
  };

  try {
    self.xhr.send(payload);
  } catch (e) {
    self.emit('finish', 0, '');
    self._cleanup(false);
  }
};

AbstractXHRObject.prototype._cleanup = function(abort) {
  debug('cleanup');
  if (!this.xhr) {
    return;
  }
  this.removeAllListeners();
  utils.unloadDel(this.unloadRef);

  // IE needs this field to be a function
  this.xhr.onreadystatechange = function() {};
  if (this.xhr.ontimeout) {
    this.xhr.ontimeout = null;
  }

  if (abort) {
    try {
      this.xhr.abort();
    } catch (x) {
      // intentionally empty
    }
  }
  this.unloadRef = this.xhr = null;
};

AbstractXHRObject.prototype.close = function() {
  debug('close');
  this._cleanup(true);
};

AbstractXHRObject.enabled = !!XHR;
// override XMLHttpRequest for IE6/7
// obfuscate to avoid firewalls
var axo = ['Active'].concat('Object').join('X');
if (!AbstractXHRObject.enabled && (axo in global)) {
  debug('overriding xmlhttprequest');
  XHR = function() {
    try {
      return new global[axo]('Microsoft.XMLHTTP');
    } catch (e) {
      return null;
    }
  };
  AbstractXHRObject.enabled = !!new XHR();
}

var cors = false;
try {
  cors = 'withCredentials' in new XHR();
} catch (ignored) {
  // intentionally empty
}

AbstractXHRObject.supportsCORS = cors;

module.exports = AbstractXHRObject;

}).call(this)}).call(this,{ env: {} },typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{"../../utils/event":46,"../../utils/url":52,"debug":55,"events":3,"inherits":57}],18:[function(require,module,exports){
(function (global){(function (){
module.exports = global.EventSource;

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{}],19:[function(require,module,exports){
(function (global){(function (){
'use strict';

var Driver = global.WebSocket || global.MozWebSocket;
if (Driver) {
	module.exports = function WebSocketBrowserDriver(url) {
		return new Driver(url);
	};
} else {
	module.exports = undefined;
}

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{}],20:[function(require,module,exports){
'use strict';

var inherits = require('inherits')
  , AjaxBasedTransport = require('./lib/ajax-based')
  , EventSourceReceiver = require('./receiver/eventsource')
  , XHRCorsObject = require('./sender/xhr-cors')
  , EventSourceDriver = require('eventsource')
  ;

function EventSourceTransport(transUrl) {
  if (!EventSourceTransport.enabled()) {
    throw new Error('Transport created when disabled');
  }

  AjaxBasedTransport.call(this, transUrl, '/eventsource', EventSourceReceiver, XHRCorsObject);
}

inherits(EventSourceTransport, AjaxBasedTransport);

EventSourceTransport.enabled = function() {
  return !!EventSourceDriver;
};

EventSourceTransport.transportName = 'eventsource';
EventSourceTransport.roundTrips = 2;

module.exports = EventSourceTransport;

},{"./lib/ajax-based":24,"./receiver/eventsource":29,"./sender/xhr-cors":35,"eventsource":18,"inherits":57}],21:[function(require,module,exports){
'use strict';

var inherits = require('inherits')
  , HtmlfileReceiver = require('./receiver/htmlfile')
  , XHRLocalObject = require('./sender/xhr-local')
  , AjaxBasedTransport = require('./lib/ajax-based')
  ;

function HtmlFileTransport(transUrl) {
  if (!HtmlfileReceiver.enabled) {
    throw new Error('Transport created when disabled');
  }
  AjaxBasedTransport.call(this, transUrl, '/htmlfile', HtmlfileReceiver, XHRLocalObject);
}

inherits(HtmlFileTransport, AjaxBasedTransport);

HtmlFileTransport.enabled = function(info) {
  return HtmlfileReceiver.enabled && info.sameOrigin;
};

HtmlFileTransport.transportName = 'htmlfile';
HtmlFileTransport.roundTrips = 2;

module.exports = HtmlFileTransport;

},{"./lib/ajax-based":24,"./receiver/htmlfile":30,"./sender/xhr-local":37,"inherits":57}],22:[function(require,module,exports){
(function (process){(function (){
'use strict';

// Few cool transports do work only for same-origin. In order to make
// them work cross-domain we shall use iframe, served from the
// remote domain. New browsers have capabilities to communicate with
// cross domain iframe using postMessage(). In IE it was implemented
// from IE 8+, but of course, IE got some details wrong:
//    http://msdn.microsoft.com/en-us/library/cc197015(v=VS.85).aspx
//    http://stevesouders.com/misc/test-postmessage.php

var inherits = require('inherits')
  , EventEmitter = require('events').EventEmitter
  , version = require('../version')
  , urlUtils = require('../utils/url')
  , iframeUtils = require('../utils/iframe')
  , eventUtils = require('../utils/event')
  , random = require('../utils/random')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:transport:iframe');
}

function IframeTransport(transport, transUrl, baseUrl) {
  if (!IframeTransport.enabled()) {
    throw new Error('Transport created when disabled');
  }
  EventEmitter.call(this);

  var self = this;
  this.origin = urlUtils.getOrigin(baseUrl);
  this.baseUrl = baseUrl;
  this.transUrl = transUrl;
  this.transport = transport;
  this.windowId = random.string(8);

  var iframeUrl = urlUtils.addPath(baseUrl, '/iframe.html') + '#' + this.windowId;
  debug(transport, transUrl, iframeUrl);

  this.iframeObj = iframeUtils.createIframe(iframeUrl, function(r) {
    debug('err callback');
    self.emit('close', 1006, 'Unable to load an iframe (' + r + ')');
    self.close();
  });

  this.onmessageCallback = this._message.bind(this);
  eventUtils.attachEvent('message', this.onmessageCallback);
}

inherits(IframeTransport, EventEmitter);

IframeTransport.prototype.close = function() {
  debug('close');
  this.removeAllListeners();
  if (this.iframeObj) {
    eventUtils.detachEvent('message', this.onmessageCallback);
    try {
      // When the iframe is not loaded, IE raises an exception
      // on 'contentWindow'.
      this.postMessage('c');
    } catch (x) {
      // intentionally empty
    }
    this.iframeObj.cleanup();
    this.iframeObj = null;
    this.onmessageCallback = this.iframeObj = null;
  }
};

IframeTransport.prototype._message = function(e) {
  debug('message', e.data);
  if (!urlUtils.isOriginEqual(e.origin, this.origin)) {
    debug('not same origin', e.origin, this.origin);
    return;
  }

  var iframeMessage;
  try {
    iframeMessage = JSON.parse(e.data);
  } catch (ignored) {
    debug('bad json', e.data);
    return;
  }

  if (iframeMessage.windowId !== this.windowId) {
    debug('mismatched window id', iframeMessage.windowId, this.windowId);
    return;
  }

  switch (iframeMessage.type) {
  case 's':
    this.iframeObj.loaded();
    // window global dependency
    this.postMessage('s', JSON.stringify([
      version
    , this.transport
    , this.transUrl
    , this.baseUrl
    ]));
    break;
  case 't':
    this.emit('message', iframeMessage.data);
    break;
  case 'c':
    var cdata;
    try {
      cdata = JSON.parse(iframeMessage.data);
    } catch (ignored) {
      debug('bad json', iframeMessage.data);
      return;
    }
    this.emit('close', cdata[0], cdata[1]);
    this.close();
    break;
  }
};

IframeTransport.prototype.postMessage = function(type, data) {
  debug('postMessage', type, data);
  this.iframeObj.post(JSON.stringify({
    windowId: this.windowId
  , type: type
  , data: data || ''
  }), this.origin);
};

IframeTransport.prototype.send = function(message) {
  debug('send', message);
  this.postMessage('m', message);
};

IframeTransport.enabled = function() {
  return iframeUtils.iframeEnabled;
};

IframeTransport.transportName = 'iframe';
IframeTransport.roundTrips = 2;

module.exports = IframeTransport;

}).call(this)}).call(this,{ env: {} })

},{"../utils/event":46,"../utils/iframe":47,"../utils/random":50,"../utils/url":52,"../version":53,"debug":55,"events":3,"inherits":57}],23:[function(require,module,exports){
(function (global){(function (){
'use strict';

// The simplest and most robust transport, using the well-know cross
// domain hack - JSONP. This transport is quite inefficient - one
// message could use up to one http request. But at least it works almost
// everywhere.
// Known limitations:
//   o you will get a spinning cursor
//   o for Konqueror a dumb timer is needed to detect errors

var inherits = require('inherits')
  , SenderReceiver = require('./lib/sender-receiver')
  , JsonpReceiver = require('./receiver/jsonp')
  , jsonpSender = require('./sender/jsonp')
  ;

function JsonPTransport(transUrl) {
  if (!JsonPTransport.enabled()) {
    throw new Error('Transport created when disabled');
  }
  SenderReceiver.call(this, transUrl, '/jsonp', jsonpSender, JsonpReceiver);
}

inherits(JsonPTransport, SenderReceiver);

JsonPTransport.enabled = function() {
  return !!global.document;
};

JsonPTransport.transportName = 'jsonp-polling';
JsonPTransport.roundTrips = 1;
JsonPTransport.needBody = true;

module.exports = JsonPTransport;

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{"./lib/sender-receiver":28,"./receiver/jsonp":31,"./sender/jsonp":33,"inherits":57}],24:[function(require,module,exports){
(function (process){(function (){
'use strict';

var inherits = require('inherits')
  , urlUtils = require('../../utils/url')
  , SenderReceiver = require('./sender-receiver')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:ajax-based');
}

function createAjaxSender(AjaxObject) {
  return function(url, payload, callback) {
    debug('create ajax sender', url, payload);
    var opt = {};
    if (typeof payload === 'string') {
      opt.headers = {'Content-type': 'text/plain'};
    }
    var ajaxUrl = urlUtils.addPath(url, '/xhr_send');
    var xo = new AjaxObject('POST', ajaxUrl, payload, opt);
    xo.once('finish', function(status) {
      debug('finish', status);
      xo = null;

      if (status !== 200 && status !== 204) {
        return callback(new Error('http status ' + status));
      }
      callback();
    });
    return function() {
      debug('abort');
      xo.close();
      xo = null;

      var err = new Error('Aborted');
      err.code = 1000;
      callback(err);
    };
  };
}

function AjaxBasedTransport(transUrl, urlSuffix, Receiver, AjaxObject) {
  SenderReceiver.call(this, transUrl, urlSuffix, createAjaxSender(AjaxObject), Receiver, AjaxObject);
}

inherits(AjaxBasedTransport, SenderReceiver);

module.exports = AjaxBasedTransport;

}).call(this)}).call(this,{ env: {} })

},{"../../utils/url":52,"./sender-receiver":28,"debug":55,"inherits":57}],25:[function(require,module,exports){
(function (process){(function (){
'use strict';

var inherits = require('inherits')
  , EventEmitter = require('events').EventEmitter
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:buffered-sender');
}

function BufferedSender(url, sender) {
  debug(url);
  EventEmitter.call(this);
  this.sendBuffer = [];
  this.sender = sender;
  this.url = url;
}

inherits(BufferedSender, EventEmitter);

BufferedSender.prototype.send = function(message) {
  debug('send', message);
  this.sendBuffer.push(message);
  if (!this.sendStop) {
    this.sendSchedule();
  }
};

// For polling transports in a situation when in the message callback,
// new message is being send. If the sending connection was started
// before receiving one, it is possible to saturate the network and
// timeout due to the lack of receiving socket. To avoid that we delay
// sending messages by some small time, in order to let receiving
// connection be started beforehand. This is only a halfmeasure and
// does not fix the big problem, but it does make the tests go more
// stable on slow networks.
BufferedSender.prototype.sendScheduleWait = function() {
  debug('sendScheduleWait');
  var self = this;
  var tref;
  this.sendStop = function() {
    debug('sendStop');
    self.sendStop = null;
    clearTimeout(tref);
  };
  tref = setTimeout(function() {
    debug('timeout');
    self.sendStop = null;
    self.sendSchedule();
  }, 25);
};

BufferedSender.prototype.sendSchedule = function() {
  debug('sendSchedule', this.sendBuffer.length);
  var self = this;
  if (this.sendBuffer.length > 0) {
    var payload = '[' + this.sendBuffer.join(',') + ']';
    this.sendStop = this.sender(this.url, payload, function(err) {
      self.sendStop = null;
      if (err) {
        debug('error', err);
        self.emit('close', err.code || 1006, 'Sending error: ' + err);
        self.close();
      } else {
        self.sendScheduleWait();
      }
    });
    this.sendBuffer = [];
  }
};

BufferedSender.prototype._cleanup = function() {
  debug('_cleanup');
  this.removeAllListeners();
};

BufferedSender.prototype.close = function() {
  debug('close');
  this._cleanup();
  if (this.sendStop) {
    this.sendStop();
    this.sendStop = null;
  }
};

module.exports = BufferedSender;

}).call(this)}).call(this,{ env: {} })

},{"debug":55,"events":3,"inherits":57}],26:[function(require,module,exports){
(function (global){(function (){
'use strict';

var inherits = require('inherits')
  , IframeTransport = require('../iframe')
  , objectUtils = require('../../utils/object')
  ;

module.exports = function(transport) {

  function IframeWrapTransport(transUrl, baseUrl) {
    IframeTransport.call(this, transport.transportName, transUrl, baseUrl);
  }

  inherits(IframeWrapTransport, IframeTransport);

  IframeWrapTransport.enabled = function(url, info) {
    if (!global.document) {
      return false;
    }

    var iframeInfo = objectUtils.extend({}, info);
    iframeInfo.sameOrigin = true;
    return transport.enabled(iframeInfo) && IframeTransport.enabled();
  };

  IframeWrapTransport.transportName = 'iframe-' + transport.transportName;
  IframeWrapTransport.needBody = true;
  IframeWrapTransport.roundTrips = IframeTransport.roundTrips + transport.roundTrips - 1; // html, javascript (2) + transport - no CORS (1)

  IframeWrapTransport.facadeTransport = transport;

  return IframeWrapTransport;
};

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{"../../utils/object":49,"../iframe":22,"inherits":57}],27:[function(require,module,exports){
(function (process){(function (){
'use strict';

var inherits = require('inherits')
  , EventEmitter = require('events').EventEmitter
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:polling');
}

function Polling(Receiver, receiveUrl, AjaxObject) {
  debug(receiveUrl);
  EventEmitter.call(this);
  this.Receiver = Receiver;
  this.receiveUrl = receiveUrl;
  this.AjaxObject = AjaxObject;
  this._scheduleReceiver();
}

inherits(Polling, EventEmitter);

Polling.prototype._scheduleReceiver = function() {
  debug('_scheduleReceiver');
  var self = this;
  var poll = this.poll = new this.Receiver(this.receiveUrl, this.AjaxObject);

  poll.on('message', function(msg) {
    debug('message', msg);
    self.emit('message', msg);
  });

  poll.once('close', function(code, reason) {
    debug('close', code, reason, self.pollIsClosing);
    self.poll = poll = null;

    if (!self.pollIsClosing) {
      if (reason === 'network') {
        self._scheduleReceiver();
      } else {
        self.emit('close', code || 1006, reason);
        self.removeAllListeners();
      }
    }
  });
};

Polling.prototype.abort = function() {
  debug('abort');
  this.removeAllListeners();
  this.pollIsClosing = true;
  if (this.poll) {
    this.poll.abort();
  }
};

module.exports = Polling;

}).call(this)}).call(this,{ env: {} })

},{"debug":55,"events":3,"inherits":57}],28:[function(require,module,exports){
(function (process){(function (){
'use strict';

var inherits = require('inherits')
  , urlUtils = require('../../utils/url')
  , BufferedSender = require('./buffered-sender')
  , Polling = require('./polling')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:sender-receiver');
}

function SenderReceiver(transUrl, urlSuffix, senderFunc, Receiver, AjaxObject) {
  var pollUrl = urlUtils.addPath(transUrl, urlSuffix);
  debug(pollUrl);
  var self = this;
  BufferedSender.call(this, transUrl, senderFunc);

  this.poll = new Polling(Receiver, pollUrl, AjaxObject);
  this.poll.on('message', function(msg) {
    debug('poll message', msg);
    self.emit('message', msg);
  });
  this.poll.once('close', function(code, reason) {
    debug('poll close', code, reason);
    self.poll = null;
    self.emit('close', code, reason);
    self.close();
  });
}

inherits(SenderReceiver, BufferedSender);

SenderReceiver.prototype.close = function() {
  BufferedSender.prototype.close.call(this);
  debug('close');
  this.removeAllListeners();
  if (this.poll) {
    this.poll.abort();
    this.poll = null;
  }
};

module.exports = SenderReceiver;

}).call(this)}).call(this,{ env: {} })

},{"../../utils/url":52,"./buffered-sender":25,"./polling":27,"debug":55,"inherits":57}],29:[function(require,module,exports){
(function (process){(function (){
'use strict';

var inherits = require('inherits')
  , EventEmitter = require('events').EventEmitter
  , EventSourceDriver = require('eventsource')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:receiver:eventsource');
}

function EventSourceReceiver(url) {
  debug(url);
  EventEmitter.call(this);

  var self = this;
  var es = this.es = new EventSourceDriver(url);
  es.onmessage = function(e) {
    debug('message', e.data);
    self.emit('message', decodeURI(e.data));
  };
  es.onerror = function(e) {
    debug('error', es.readyState, e);
    // ES on reconnection has readyState = 0 or 1.
    // on network error it's CLOSED = 2
    var reason = (es.readyState !== 2 ? 'network' : 'permanent');
    self._cleanup();
    self._close(reason);
  };
}

inherits(EventSourceReceiver, EventEmitter);

EventSourceReceiver.prototype.abort = function() {
  debug('abort');
  this._cleanup();
  this._close('user');
};

EventSourceReceiver.prototype._cleanup = function() {
  debug('cleanup');
  var es = this.es;
  if (es) {
    es.onmessage = es.onerror = null;
    es.close();
    this.es = null;
  }
};

EventSourceReceiver.prototype._close = function(reason) {
  debug('close', reason);
  var self = this;
  // Safari and chrome < 15 crash if we close window before
  // waiting for ES cleanup. See:
  // https://code.google.com/p/chromium/issues/detail?id=89155
  setTimeout(function() {
    self.emit('close', null, reason);
    self.removeAllListeners();
  }, 200);
};

module.exports = EventSourceReceiver;

}).call(this)}).call(this,{ env: {} })

},{"debug":55,"events":3,"eventsource":18,"inherits":57}],30:[function(require,module,exports){
(function (process,global){(function (){
'use strict';

var inherits = require('inherits')
  , iframeUtils = require('../../utils/iframe')
  , urlUtils = require('../../utils/url')
  , EventEmitter = require('events').EventEmitter
  , random = require('../../utils/random')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:receiver:htmlfile');
}

function HtmlfileReceiver(url) {
  debug(url);
  EventEmitter.call(this);
  var self = this;
  iframeUtils.polluteGlobalNamespace();

  this.id = 'a' + random.string(6);
  url = urlUtils.addQuery(url, 'c=' + decodeURIComponent(iframeUtils.WPrefix + '.' + this.id));

  debug('using htmlfile', HtmlfileReceiver.htmlfileEnabled);
  var constructFunc = HtmlfileReceiver.htmlfileEnabled ?
      iframeUtils.createHtmlfile : iframeUtils.createIframe;

  global[iframeUtils.WPrefix][this.id] = {
    start: function() {
      debug('start');
      self.iframeObj.loaded();
    }
  , message: function(data) {
      debug('message', data);
      self.emit('message', data);
    }
  , stop: function() {
      debug('stop');
      self._cleanup();
      self._close('network');
    }
  };
  this.iframeObj = constructFunc(url, function() {
    debug('callback');
    self._cleanup();
    self._close('permanent');
  });
}

inherits(HtmlfileReceiver, EventEmitter);

HtmlfileReceiver.prototype.abort = function() {
  debug('abort');
  this._cleanup();
  this._close('user');
};

HtmlfileReceiver.prototype._cleanup = function() {
  debug('_cleanup');
  if (this.iframeObj) {
    this.iframeObj.cleanup();
    this.iframeObj = null;
  }
  delete global[iframeUtils.WPrefix][this.id];
};

HtmlfileReceiver.prototype._close = function(reason) {
  debug('_close', reason);
  this.emit('close', null, reason);
  this.removeAllListeners();
};

HtmlfileReceiver.htmlfileEnabled = false;

// obfuscate to avoid firewalls
var axo = ['Active'].concat('Object').join('X');
if (axo in global) {
  try {
    HtmlfileReceiver.htmlfileEnabled = !!new global[axo]('htmlfile');
  } catch (x) {
    // intentionally empty
  }
}

HtmlfileReceiver.enabled = HtmlfileReceiver.htmlfileEnabled || iframeUtils.iframeEnabled;

module.exports = HtmlfileReceiver;

}).call(this)}).call(this,{ env: {} },typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{"../../utils/iframe":47,"../../utils/random":50,"../../utils/url":52,"debug":55,"events":3,"inherits":57}],31:[function(require,module,exports){
(function (process,global){(function (){
'use strict';

var utils = require('../../utils/iframe')
  , random = require('../../utils/random')
  , browser = require('../../utils/browser')
  , urlUtils = require('../../utils/url')
  , inherits = require('inherits')
  , EventEmitter = require('events').EventEmitter
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:receiver:jsonp');
}

function JsonpReceiver(url) {
  debug(url);
  var self = this;
  EventEmitter.call(this);

  utils.polluteGlobalNamespace();

  this.id = 'a' + random.string(6);
  var urlWithId = urlUtils.addQuery(url, 'c=' + encodeURIComponent(utils.WPrefix + '.' + this.id));

  global[utils.WPrefix][this.id] = this._callback.bind(this);
  this._createScript(urlWithId);

  // Fallback mostly for Konqueror - stupid timer, 35 seconds shall be plenty.
  this.timeoutId = setTimeout(function() {
    debug('timeout');
    self._abort(new Error('JSONP script loaded abnormally (timeout)'));
  }, JsonpReceiver.timeout);
}

inherits(JsonpReceiver, EventEmitter);

JsonpReceiver.prototype.abort = function() {
  debug('abort');
  if (global[utils.WPrefix][this.id]) {
    var err = new Error('JSONP user aborted read');
    err.code = 1000;
    this._abort(err);
  }
};

JsonpReceiver.timeout = 35000;
JsonpReceiver.scriptErrorTimeout = 1000;

JsonpReceiver.prototype._callback = function(data) {
  debug('_callback', data);
  this._cleanup();

  if (this.aborting) {
    return;
  }

  if (data) {
    debug('message', data);
    this.emit('message', data);
  }
  this.emit('close', null, 'network');
  this.removeAllListeners();
};

JsonpReceiver.prototype._abort = function(err) {
  debug('_abort', err);
  this._cleanup();
  this.aborting = true;
  this.emit('close', err.code, err.message);
  this.removeAllListeners();
};

JsonpReceiver.prototype._cleanup = function() {
  debug('_cleanup');
  clearTimeout(this.timeoutId);
  if (this.script2) {
    this.script2.parentNode.removeChild(this.script2);
    this.script2 = null;
  }
  if (this.script) {
    var script = this.script;
    // Unfortunately, you can't really abort script loading of
    // the script.
    script.parentNode.removeChild(script);
    script.onreadystatechange = script.onerror =
        script.onload = script.onclick = null;
    this.script = null;
  }
  delete global[utils.WPrefix][this.id];
};

JsonpReceiver.prototype._scriptError = function() {
  debug('_scriptError');
  var self = this;
  if (this.errorTimer) {
    return;
  }

  this.errorTimer = setTimeout(function() {
    if (!self.loadedOkay) {
      self._abort(new Error('JSONP script loaded abnormally (onerror)'));
    }
  }, JsonpReceiver.scriptErrorTimeout);
};

JsonpReceiver.prototype._createScript = function(url) {
  debug('_createScript', url);
  var self = this;
  var script = this.script = global.document.createElement('script');
  var script2;  // Opera synchronous load trick.

  script.id = 'a' + random.string(8);
  script.src = url;
  script.type = 'text/javascript';
  script.charset = 'UTF-8';
  script.onerror = this._scriptError.bind(this);
  script.onload = function() {
    debug('onload');
    self._abort(new Error('JSONP script loaded abnormally (onload)'));
  };

  // IE9 fires 'error' event after onreadystatechange or before, in random order.
  // Use loadedOkay to determine if actually errored
  script.onreadystatechange = function() {
    debug('onreadystatechange', script.readyState);
    if (/loaded|closed/.test(script.readyState)) {
      if (script && script.htmlFor && script.onclick) {
        self.loadedOkay = true;
        try {
          // In IE, actually execute the script.
          script.onclick();
        } catch (x) {
          // intentionally empty
        }
      }
      if (script) {
        self._abort(new Error('JSONP script loaded abnormally (onreadystatechange)'));
      }
    }
  };
  // IE: event/htmlFor/onclick trick.
  // One can't rely on proper order for onreadystatechange. In order to
  // make sure, set a 'htmlFor' and 'event' properties, so that
  // script code will be installed as 'onclick' handler for the
  // script object. Later, onreadystatechange, manually execute this
  // code. FF and Chrome doesn't work with 'event' and 'htmlFor'
  // set. For reference see:
  //   http://jaubourg.net/2010/07/loading-script-as-onclick-handler-of.html
  // Also, read on that about script ordering:
  //   http://wiki.whatwg.org/wiki/Dynamic_Script_Execution_Order
  if (typeof script.async === 'undefined' && global.document.attachEvent) {
    // According to mozilla docs, in recent browsers script.async defaults
    // to 'true', so we may use it to detect a good browser:
    // https://developer.mozilla.org/en/HTML/Element/script
    if (!browser.isOpera()) {
      // Naively assume we're in IE
      try {
        script.htmlFor = script.id;
        script.event = 'onclick';
      } catch (x) {
        // intentionally empty
      }
      script.async = true;
    } else {
      // Opera, second sync script hack
      script2 = this.script2 = global.document.createElement('script');
      script2.text = "try{var a = document.getElementById('" + script.id + "'); if(a)a.onerror();}catch(x){};";
      script.async = script2.async = false;
    }
  }
  if (typeof script.async !== 'undefined') {
    script.async = true;
  }

  var head = global.document.getElementsByTagName('head')[0];
  head.insertBefore(script, head.firstChild);
  if (script2) {
    head.insertBefore(script2, head.firstChild);
  }
};

module.exports = JsonpReceiver;

}).call(this)}).call(this,{ env: {} },typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{"../../utils/browser":44,"../../utils/iframe":47,"../../utils/random":50,"../../utils/url":52,"debug":55,"events":3,"inherits":57}],32:[function(require,module,exports){
(function (process){(function (){
'use strict';

var inherits = require('inherits')
  , EventEmitter = require('events').EventEmitter
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:receiver:xhr');
}

function XhrReceiver(url, AjaxObject) {
  debug(url);
  EventEmitter.call(this);
  var self = this;

  this.bufferPosition = 0;

  this.xo = new AjaxObject('POST', url, null);
  this.xo.on('chunk', this._chunkHandler.bind(this));
  this.xo.once('finish', function(status, text) {
    debug('finish', status, text);
    self._chunkHandler(status, text);
    self.xo = null;
    var reason = status === 200 ? 'network' : 'permanent';
    debug('close', reason);
    self.emit('close', null, reason);
    self._cleanup();
  });
}

inherits(XhrReceiver, EventEmitter);

XhrReceiver.prototype._chunkHandler = function(status, text) {
  debug('_chunkHandler', status);
  if (status !== 200 || !text) {
    return;
  }

  for (var idx = -1; ; this.bufferPosition += idx + 1) {
    var buf = text.slice(this.bufferPosition);
    idx = buf.indexOf('\n');
    if (idx === -1) {
      break;
    }
    var msg = buf.slice(0, idx);
    if (msg) {
      debug('message', msg);
      this.emit('message', msg);
    }
  }
};

XhrReceiver.prototype._cleanup = function() {
  debug('_cleanup');
  this.removeAllListeners();
};

XhrReceiver.prototype.abort = function() {
  debug('abort');
  if (this.xo) {
    this.xo.close();
    debug('close');
    this.emit('close', null, 'user');
    this.xo = null;
  }
  this._cleanup();
};

module.exports = XhrReceiver;

}).call(this)}).call(this,{ env: {} })

},{"debug":55,"events":3,"inherits":57}],33:[function(require,module,exports){
(function (process,global){(function (){
'use strict';

var random = require('../../utils/random')
  , urlUtils = require('../../utils/url')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:sender:jsonp');
}

var form, area;

function createIframe(id) {
  debug('createIframe', id);
  try {
    // ie6 dynamic iframes with target="" support (thanks Chris Lambacher)
    return global.document.createElement('<iframe name="' + id + '">');
  } catch (x) {
    var iframe = global.document.createElement('iframe');
    iframe.name = id;
    return iframe;
  }
}

function createForm() {
  debug('createForm');
  form = global.document.createElement('form');
  form.style.display = 'none';
  form.style.position = 'absolute';
  form.method = 'POST';
  form.enctype = 'application/x-www-form-urlencoded';
  form.acceptCharset = 'UTF-8';

  area = global.document.createElement('textarea');
  area.name = 'd';
  form.appendChild(area);

  global.document.body.appendChild(form);
}

module.exports = function(url, payload, callback) {
  debug(url, payload);
  if (!form) {
    createForm();
  }
  var id = 'a' + random.string(8);
  form.target = id;
  form.action = urlUtils.addQuery(urlUtils.addPath(url, '/jsonp_send'), 'i=' + id);

  var iframe = createIframe(id);
  iframe.id = id;
  iframe.style.display = 'none';
  form.appendChild(iframe);

  try {
    area.value = payload;
  } catch (e) {
    // seriously broken browsers get here
  }
  form.submit();

  var completed = function(err) {
    debug('completed', id, err);
    if (!iframe.onerror) {
      return;
    }
    iframe.onreadystatechange = iframe.onerror = iframe.onload = null;
    // Opera mini doesn't like if we GC iframe
    // immediately, thus this timeout.
    setTimeout(function() {
      debug('cleaning up', id);
      iframe.parentNode.removeChild(iframe);
      iframe = null;
    }, 500);
    area.value = '';
    // It is not possible to detect if the iframe succeeded or
    // failed to submit our form.
    callback(err);
  };
  iframe.onerror = function() {
    debug('onerror', id);
    completed();
  };
  iframe.onload = function() {
    debug('onload', id);
    completed();
  };
  iframe.onreadystatechange = function(e) {
    debug('onreadystatechange', id, iframe.readyState, e);
    if (iframe.readyState === 'complete') {
      completed();
    }
  };
  return function() {
    debug('aborted', id);
    completed(new Error('Aborted'));
  };
};

}).call(this)}).call(this,{ env: {} },typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{"../../utils/random":50,"../../utils/url":52,"debug":55}],34:[function(require,module,exports){
(function (process,global){(function (){
'use strict';

var EventEmitter = require('events').EventEmitter
  , inherits = require('inherits')
  , eventUtils = require('../../utils/event')
  , browser = require('../../utils/browser')
  , urlUtils = require('../../utils/url')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:sender:xdr');
}

// References:
//   http://ajaxian.com/archives/100-line-ajax-wrapper
//   http://msdn.microsoft.com/en-us/library/cc288060(v=VS.85).aspx

function XDRObject(method, url, payload) {
  debug(method, url);
  var self = this;
  EventEmitter.call(this);

  setTimeout(function() {
    self._start(method, url, payload);
  }, 0);
}

inherits(XDRObject, EventEmitter);

XDRObject.prototype._start = function(method, url, payload) {
  debug('_start');
  var self = this;
  var xdr = new global.XDomainRequest();
  // IE caches even POSTs
  url = urlUtils.addQuery(url, 't=' + (+new Date()));

  xdr.onerror = function() {
    debug('onerror');
    self._error();
  };
  xdr.ontimeout = function() {
    debug('ontimeout');
    self._error();
  };
  xdr.onprogress = function() {
    debug('progress', xdr.responseText);
    self.emit('chunk', 200, xdr.responseText);
  };
  xdr.onload = function() {
    debug('load');
    self.emit('finish', 200, xdr.responseText);
    self._cleanup(false);
  };
  this.xdr = xdr;
  this.unloadRef = eventUtils.unloadAdd(function() {
    self._cleanup(true);
  });
  try {
    // Fails with AccessDenied if port number is bogus
    this.xdr.open(method, url);
    if (this.timeout) {
      this.xdr.timeout = this.timeout;
    }
    this.xdr.send(payload);
  } catch (x) {
    this._error();
  }
};

XDRObject.prototype._error = function() {
  this.emit('finish', 0, '');
  this._cleanup(false);
};

XDRObject.prototype._cleanup = function(abort) {
  debug('cleanup', abort);
  if (!this.xdr) {
    return;
  }
  this.removeAllListeners();
  eventUtils.unloadDel(this.unloadRef);

  this.xdr.ontimeout = this.xdr.onerror = this.xdr.onprogress = this.xdr.onload = null;
  if (abort) {
    try {
      this.xdr.abort();
    } catch (x) {
      // intentionally empty
    }
  }
  this.unloadRef = this.xdr = null;
};

XDRObject.prototype.close = function() {
  debug('close');
  this._cleanup(true);
};

// IE 8/9 if the request target uses the same scheme - #79
XDRObject.enabled = !!(global.XDomainRequest && browser.hasDomain());

module.exports = XDRObject;

}).call(this)}).call(this,{ env: {} },typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{"../../utils/browser":44,"../../utils/event":46,"../../utils/url":52,"debug":55,"events":3,"inherits":57}],35:[function(require,module,exports){
'use strict';

var inherits = require('inherits')
  , XhrDriver = require('../driver/xhr')
  ;

function XHRCorsObject(method, url, payload, opts) {
  XhrDriver.call(this, method, url, payload, opts);
}

inherits(XHRCorsObject, XhrDriver);

XHRCorsObject.enabled = XhrDriver.enabled && XhrDriver.supportsCORS;

module.exports = XHRCorsObject;

},{"../driver/xhr":17,"inherits":57}],36:[function(require,module,exports){
'use strict';

var EventEmitter = require('events').EventEmitter
  , inherits = require('inherits')
  ;

function XHRFake(/* method, url, payload, opts */) {
  var self = this;
  EventEmitter.call(this);

  this.to = setTimeout(function() {
    self.emit('finish', 200, '{}');
  }, XHRFake.timeout);
}

inherits(XHRFake, EventEmitter);

XHRFake.prototype.close = function() {
  clearTimeout(this.to);
};

XHRFake.timeout = 2000;

module.exports = XHRFake;

},{"events":3,"inherits":57}],37:[function(require,module,exports){
'use strict';

var inherits = require('inherits')
  , XhrDriver = require('../driver/xhr')
  ;

function XHRLocalObject(method, url, payload /*, opts */) {
  XhrDriver.call(this, method, url, payload, {
    noCredentials: true
  });
}

inherits(XHRLocalObject, XhrDriver);

XHRLocalObject.enabled = XhrDriver.enabled;

module.exports = XHRLocalObject;

},{"../driver/xhr":17,"inherits":57}],38:[function(require,module,exports){
(function (process){(function (){
'use strict';

var utils = require('../utils/event')
  , urlUtils = require('../utils/url')
  , inherits = require('inherits')
  , EventEmitter = require('events').EventEmitter
  , WebsocketDriver = require('./driver/websocket')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:websocket');
}

function WebSocketTransport(transUrl, ignore, options) {
  if (!WebSocketTransport.enabled()) {
    throw new Error('Transport created when disabled');
  }

  EventEmitter.call(this);
  debug('constructor', transUrl);

  var self = this;
  var url = urlUtils.addPath(transUrl, '/websocket');
  if (url.slice(0, 5) === 'https') {
    url = 'wss' + url.slice(5);
  } else {
    url = 'ws' + url.slice(4);
  }
  this.url = url;

  this.ws = new WebsocketDriver(this.url, [], options);
  this.ws.onmessage = function(e) {
    debug('message event', e.data);
    self.emit('message', e.data);
  };
  // Firefox has an interesting bug. If a websocket connection is
  // created after onunload, it stays alive even when user
  // navigates away from the page. In such situation let's lie -
  // let's not open the ws connection at all. See:
  // https://github.com/sockjs/sockjs-client/issues/28
  // https://bugzilla.mozilla.org/show_bug.cgi?id=696085
  this.unloadRef = utils.unloadAdd(function() {
    debug('unload');
    self.ws.close();
  });
  this.ws.onclose = function(e) {
    debug('close event', e.code, e.reason);
    self.emit('close', e.code, e.reason);
    self._cleanup();
  };
  this.ws.onerror = function(e) {
    debug('error event', e);
    self.emit('close', 1006, 'WebSocket connection broken');
    self._cleanup();
  };
}

inherits(WebSocketTransport, EventEmitter);

WebSocketTransport.prototype.send = function(data) {
  var msg = '[' + data + ']';
  debug('send', msg);
  this.ws.send(msg);
};

WebSocketTransport.prototype.close = function() {
  debug('close');
  var ws = this.ws;
  this._cleanup();
  if (ws) {
    ws.close();
  }
};

WebSocketTransport.prototype._cleanup = function() {
  debug('_cleanup');
  var ws = this.ws;
  if (ws) {
    ws.onmessage = ws.onclose = ws.onerror = null;
  }
  utils.unloadDel(this.unloadRef);
  this.unloadRef = this.ws = null;
  this.removeAllListeners();
};

WebSocketTransport.enabled = function() {
  debug('enabled');
  return !!WebsocketDriver;
};
WebSocketTransport.transportName = 'websocket';

// In theory, ws should require 1 round trip. But in chrome, this is
// not very stable over SSL. Most likely a ws connection requires a
// separate SSL connection, in which case 2 round trips are an
// absolute minumum.
WebSocketTransport.roundTrips = 2;

module.exports = WebSocketTransport;

}).call(this)}).call(this,{ env: {} })

},{"../utils/event":46,"../utils/url":52,"./driver/websocket":19,"debug":55,"events":3,"inherits":57}],39:[function(require,module,exports){
'use strict';

var inherits = require('inherits')
  , AjaxBasedTransport = require('./lib/ajax-based')
  , XdrStreamingTransport = require('./xdr-streaming')
  , XhrReceiver = require('./receiver/xhr')
  , XDRObject = require('./sender/xdr')
  ;

function XdrPollingTransport(transUrl) {
  if (!XDRObject.enabled) {
    throw new Error('Transport created when disabled');
  }
  AjaxBasedTransport.call(this, transUrl, '/xhr', XhrReceiver, XDRObject);
}

inherits(XdrPollingTransport, AjaxBasedTransport);

XdrPollingTransport.enabled = XdrStreamingTransport.enabled;
XdrPollingTransport.transportName = 'xdr-polling';
XdrPollingTransport.roundTrips = 2; // preflight, ajax

module.exports = XdrPollingTransport;

},{"./lib/ajax-based":24,"./receiver/xhr":32,"./sender/xdr":34,"./xdr-streaming":40,"inherits":57}],40:[function(require,module,exports){
'use strict';

var inherits = require('inherits')
  , AjaxBasedTransport = require('./lib/ajax-based')
  , XhrReceiver = require('./receiver/xhr')
  , XDRObject = require('./sender/xdr')
  ;

// According to:
//   http://stackoverflow.com/questions/1641507/detect-browser-support-for-cross-domain-xmlhttprequests
//   http://hacks.mozilla.org/2009/07/cross-site-xmlhttprequest-with-cors/

function XdrStreamingTransport(transUrl) {
  if (!XDRObject.enabled) {
    throw new Error('Transport created when disabled');
  }
  AjaxBasedTransport.call(this, transUrl, '/xhr_streaming', XhrReceiver, XDRObject);
}

inherits(XdrStreamingTransport, AjaxBasedTransport);

XdrStreamingTransport.enabled = function(info) {
  if (info.cookie_needed || info.nullOrigin) {
    return false;
  }
  return XDRObject.enabled && info.sameScheme;
};

XdrStreamingTransport.transportName = 'xdr-streaming';
XdrStreamingTransport.roundTrips = 2; // preflight, ajax

module.exports = XdrStreamingTransport;

},{"./lib/ajax-based":24,"./receiver/xhr":32,"./sender/xdr":34,"inherits":57}],41:[function(require,module,exports){
'use strict';

var inherits = require('inherits')
  , AjaxBasedTransport = require('./lib/ajax-based')
  , XhrReceiver = require('./receiver/xhr')
  , XHRCorsObject = require('./sender/xhr-cors')
  , XHRLocalObject = require('./sender/xhr-local')
  ;

function XhrPollingTransport(transUrl) {
  if (!XHRLocalObject.enabled && !XHRCorsObject.enabled) {
    throw new Error('Transport created when disabled');
  }
  AjaxBasedTransport.call(this, transUrl, '/xhr', XhrReceiver, XHRCorsObject);
}

inherits(XhrPollingTransport, AjaxBasedTransport);

XhrPollingTransport.enabled = function(info) {
  if (info.nullOrigin) {
    return false;
  }

  if (XHRLocalObject.enabled && info.sameOrigin) {
    return true;
  }
  return XHRCorsObject.enabled;
};

XhrPollingTransport.transportName = 'xhr-polling';
XhrPollingTransport.roundTrips = 2; // preflight, ajax

module.exports = XhrPollingTransport;

},{"./lib/ajax-based":24,"./receiver/xhr":32,"./sender/xhr-cors":35,"./sender/xhr-local":37,"inherits":57}],42:[function(require,module,exports){
(function (global){(function (){
'use strict';

var inherits = require('inherits')
  , AjaxBasedTransport = require('./lib/ajax-based')
  , XhrReceiver = require('./receiver/xhr')
  , XHRCorsObject = require('./sender/xhr-cors')
  , XHRLocalObject = require('./sender/xhr-local')
  , browser = require('../utils/browser')
  ;

function XhrStreamingTransport(transUrl) {
  if (!XHRLocalObject.enabled && !XHRCorsObject.enabled) {
    throw new Error('Transport created when disabled');
  }
  AjaxBasedTransport.call(this, transUrl, '/xhr_streaming', XhrReceiver, XHRCorsObject);
}

inherits(XhrStreamingTransport, AjaxBasedTransport);

XhrStreamingTransport.enabled = function(info) {
  if (info.nullOrigin) {
    return false;
  }
  // Opera doesn't support xhr-streaming #60
  // But it might be able to #92
  if (browser.isOpera()) {
    return false;
  }

  return XHRCorsObject.enabled;
};

XhrStreamingTransport.transportName = 'xhr-streaming';
XhrStreamingTransport.roundTrips = 2; // preflight, ajax

// Safari gets confused when a streaming ajax request is started
// before onload. This causes the load indicator to spin indefinetely.
// Only require body when used in a browser
XhrStreamingTransport.needBody = !!global.document;

module.exports = XhrStreamingTransport;

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{"../utils/browser":44,"./lib/ajax-based":24,"./receiver/xhr":32,"./sender/xhr-cors":35,"./sender/xhr-local":37,"inherits":57}],43:[function(require,module,exports){
(function (global){(function (){
'use strict';

if (global.crypto && global.crypto.getRandomValues) {
  module.exports.randomBytes = function(length) {
    var bytes = new Uint8Array(length);
    global.crypto.getRandomValues(bytes);
    return bytes;
  };
} else {
  module.exports.randomBytes = function(length) {
    var bytes = new Array(length);
    for (var i = 0; i < length; i++) {
      bytes[i] = Math.floor(Math.random() * 256);
    }
    return bytes;
  };
}

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{}],44:[function(require,module,exports){
(function (global){(function (){
'use strict';

module.exports = {
  isOpera: function() {
    return global.navigator &&
      /opera/i.test(global.navigator.userAgent);
  }

, isKonqueror: function() {
    return global.navigator &&
      /konqueror/i.test(global.navigator.userAgent);
  }

  // #187 wrap document.domain in try/catch because of WP8 from file:///
, hasDomain: function () {
    // non-browser client always has a domain
    if (!global.document) {
      return true;
    }

    try {
      return !!global.document.domain;
    } catch (e) {
      return false;
    }
  }
};

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{}],45:[function(require,module,exports){
'use strict';

// Some extra characters that Chrome gets wrong, and substitutes with
// something else on the wire.
// eslint-disable-next-line no-control-regex, no-misleading-character-class
var extraEscapable = /[\x00-\x1f\ud800-\udfff\ufffe\uffff\u0300-\u0333\u033d-\u0346\u034a-\u034c\u0350-\u0352\u0357-\u0358\u035c-\u0362\u0374\u037e\u0387\u0591-\u05af\u05c4\u0610-\u0617\u0653-\u0654\u0657-\u065b\u065d-\u065e\u06df-\u06e2\u06eb-\u06ec\u0730\u0732-\u0733\u0735-\u0736\u073a\u073d\u073f-\u0741\u0743\u0745\u0747\u07eb-\u07f1\u0951\u0958-\u095f\u09dc-\u09dd\u09df\u0a33\u0a36\u0a59-\u0a5b\u0a5e\u0b5c-\u0b5d\u0e38-\u0e39\u0f43\u0f4d\u0f52\u0f57\u0f5c\u0f69\u0f72-\u0f76\u0f78\u0f80-\u0f83\u0f93\u0f9d\u0fa2\u0fa7\u0fac\u0fb9\u1939-\u193a\u1a17\u1b6b\u1cda-\u1cdb\u1dc0-\u1dcf\u1dfc\u1dfe\u1f71\u1f73\u1f75\u1f77\u1f79\u1f7b\u1f7d\u1fbb\u1fbe\u1fc9\u1fcb\u1fd3\u1fdb\u1fe3\u1feb\u1fee-\u1fef\u1ff9\u1ffb\u1ffd\u2000-\u2001\u20d0-\u20d1\u20d4-\u20d7\u20e7-\u20e9\u2126\u212a-\u212b\u2329-\u232a\u2adc\u302b-\u302c\uaab2-\uaab3\uf900-\ufa0d\ufa10\ufa12\ufa15-\ufa1e\ufa20\ufa22\ufa25-\ufa26\ufa2a-\ufa2d\ufa30-\ufa6d\ufa70-\ufad9\ufb1d\ufb1f\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40-\ufb41\ufb43-\ufb44\ufb46-\ufb4e\ufff0-\uffff]/g
  , extraLookup;

// This may be quite slow, so let's delay until user actually uses bad
// characters.
var unrollLookup = function(escapable) {
  var i;
  var unrolled = {};
  var c = [];
  for (i = 0; i < 65536; i++) {
    c.push( String.fromCharCode(i) );
  }
  escapable.lastIndex = 0;
  c.join('').replace(escapable, function(a) {
    unrolled[ a ] = '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
    return '';
  });
  escapable.lastIndex = 0;
  return unrolled;
};

// Quote string, also taking care of unicode characters that browsers
// often break. Especially, take care of unicode surrogates:
// http://en.wikipedia.org/wiki/Mapping_of_Unicode_characters#Surrogates
module.exports = {
  quote: function(string) {
    var quoted = JSON.stringify(string);

    // In most cases this should be very fast and good enough.
    extraEscapable.lastIndex = 0;
    if (!extraEscapable.test(quoted)) {
      return quoted;
    }

    if (!extraLookup) {
      extraLookup = unrollLookup(extraEscapable);
    }

    return quoted.replace(extraEscapable, function(a) {
      return extraLookup[a];
    });
  }
};

},{}],46:[function(require,module,exports){
(function (global){(function (){
'use strict';

var random = require('./random');

var onUnload = {}
  , afterUnload = false
    // detect google chrome packaged apps because they don't allow the 'unload' event
  , isChromePackagedApp = global.chrome && global.chrome.app && global.chrome.app.runtime
  ;

module.exports = {
  attachEvent: function(event, listener) {
    if (typeof global.addEventListener !== 'undefined') {
      global.addEventListener(event, listener, false);
    } else if (global.document && global.attachEvent) {
      // IE quirks.
      // According to: http://stevesouders.com/misc/test-postmessage.php
      // the message gets delivered only to 'document', not 'window'.
      global.document.attachEvent('on' + event, listener);
      // I get 'window' for ie8.
      global.attachEvent('on' + event, listener);
    }
  }

, detachEvent: function(event, listener) {
    if (typeof global.addEventListener !== 'undefined') {
      global.removeEventListener(event, listener, false);
    } else if (global.document && global.detachEvent) {
      global.document.detachEvent('on' + event, listener);
      global.detachEvent('on' + event, listener);
    }
  }

, unloadAdd: function(listener) {
    if (isChromePackagedApp) {
      return null;
    }

    var ref = random.string(8);
    onUnload[ref] = listener;
    if (afterUnload) {
      setTimeout(this.triggerUnloadCallbacks, 0);
    }
    return ref;
  }

, unloadDel: function(ref) {
    if (ref in onUnload) {
      delete onUnload[ref];
    }
  }

, triggerUnloadCallbacks: function() {
    for (var ref in onUnload) {
      onUnload[ref]();
      delete onUnload[ref];
    }
  }
};

var unloadTriggered = function() {
  if (afterUnload) {
    return;
  }
  afterUnload = true;
  module.exports.triggerUnloadCallbacks();
};

// 'unload' alone is not reliable in opera within an iframe, but we
// can't use `beforeunload` as IE fires it on javascript: links.
if (!isChromePackagedApp) {
  module.exports.attachEvent('unload', unloadTriggered);
}

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{"./random":50}],47:[function(require,module,exports){
(function (process,global){(function (){
'use strict';

var eventUtils = require('./event')
  , browser = require('./browser')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:utils:iframe');
}

module.exports = {
  WPrefix: '_jp'
, currentWindowId: null

, polluteGlobalNamespace: function() {
    if (!(module.exports.WPrefix in global)) {
      global[module.exports.WPrefix] = {};
    }
  }

, postMessage: function(type, data) {
    if (global.parent !== global) {
      global.parent.postMessage(JSON.stringify({
        windowId: module.exports.currentWindowId
      , type: type
      , data: data || ''
      }), '*');
    } else {
      debug('Cannot postMessage, no parent window.', type, data);
    }
  }

, createIframe: function(iframeUrl, errorCallback) {
    var iframe = global.document.createElement('iframe');
    var tref, unloadRef;
    var unattach = function() {
      debug('unattach');
      clearTimeout(tref);
      // Explorer had problems with that.
      try {
        iframe.onload = null;
      } catch (x) {
        // intentionally empty
      }
      iframe.onerror = null;
    };
    var cleanup = function() {
      debug('cleanup');
      if (iframe) {
        unattach();
        // This timeout makes chrome fire onbeforeunload event
        // within iframe. Without the timeout it goes straight to
        // onunload.
        setTimeout(function() {
          if (iframe) {
            iframe.parentNode.removeChild(iframe);
          }
          iframe = null;
        }, 0);
        eventUtils.unloadDel(unloadRef);
      }
    };
    var onerror = function(err) {
      debug('onerror', err);
      if (iframe) {
        cleanup();
        errorCallback(err);
      }
    };
    var post = function(msg, origin) {
      debug('post', msg, origin);
      setTimeout(function() {
        try {
          // When the iframe is not loaded, IE raises an exception
          // on 'contentWindow'.
          if (iframe && iframe.contentWindow) {
            iframe.contentWindow.postMessage(msg, origin);
          }
        } catch (x) {
          // intentionally empty
        }
      }, 0);
    };

    iframe.src = iframeUrl;
    iframe.style.display = 'none';
    iframe.style.position = 'absolute';
    iframe.onerror = function() {
      onerror('onerror');
    };
    iframe.onload = function() {
      debug('onload');
      // `onload` is triggered before scripts on the iframe are
      // executed. Give it few seconds to actually load stuff.
      clearTimeout(tref);
      tref = setTimeout(function() {
        onerror('onload timeout');
      }, 2000);
    };
    global.document.body.appendChild(iframe);
    tref = setTimeout(function() {
      onerror('timeout');
    }, 15000);
    unloadRef = eventUtils.unloadAdd(cleanup);
    return {
      post: post
    , cleanup: cleanup
    , loaded: unattach
    };
  }

/* eslint no-undef: "off", new-cap: "off" */
, createHtmlfile: function(iframeUrl, errorCallback) {
    var axo = ['Active'].concat('Object').join('X');
    var doc = new global[axo]('htmlfile');
    var tref, unloadRef;
    var iframe;
    var unattach = function() {
      clearTimeout(tref);
      iframe.onerror = null;
    };
    var cleanup = function() {
      if (doc) {
        unattach();
        eventUtils.unloadDel(unloadRef);
        iframe.parentNode.removeChild(iframe);
        iframe = doc = null;
        CollectGarbage();
      }
    };
    var onerror = function(r) {
      debug('onerror', r);
      if (doc) {
        cleanup();
        errorCallback(r);
      }
    };
    var post = function(msg, origin) {
      try {
        // When the iframe is not loaded, IE raises an exception
        // on 'contentWindow'.
        setTimeout(function() {
          if (iframe && iframe.contentWindow) {
              iframe.contentWindow.postMessage(msg, origin);
          }
        }, 0);
      } catch (x) {
        // intentionally empty
      }
    };

    doc.open();
    doc.write('<html><s' + 'cript>' +
              'document.domain="' + global.document.domain + '";' +
              '</s' + 'cript></html>');
    doc.close();
    doc.parentWindow[module.exports.WPrefix] = global[module.exports.WPrefix];
    var c = doc.createElement('div');
    doc.body.appendChild(c);
    iframe = doc.createElement('iframe');
    c.appendChild(iframe);
    iframe.src = iframeUrl;
    iframe.onerror = function() {
      onerror('onerror');
    };
    tref = setTimeout(function() {
      onerror('timeout');
    }, 15000);
    unloadRef = eventUtils.unloadAdd(cleanup);
    return {
      post: post
    , cleanup: cleanup
    , loaded: unattach
    };
  }
};

module.exports.iframeEnabled = false;
if (global.document) {
  // postMessage misbehaves in konqueror 4.6.5 - the messages are delivered with
  // huge delay, or not at all.
  module.exports.iframeEnabled = (typeof global.postMessage === 'function' ||
    typeof global.postMessage === 'object') && (!browser.isKonqueror());
}

}).call(this)}).call(this,{ env: {} },typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{"./browser":44,"./event":46,"debug":55}],48:[function(require,module,exports){
(function (global){(function (){
'use strict';

var logObject = {};
['log', 'debug', 'warn'].forEach(function (level) {
  var levelExists;

  try {
    levelExists = global.console && global.console[level] && global.console[level].apply;
  } catch(e) {
    // do nothing
  }

  logObject[level] = levelExists ? function () {
    return global.console[level].apply(global.console, arguments);
  } : (level === 'log' ? function () {} : logObject.log);
});

module.exports = logObject;

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{}],49:[function(require,module,exports){
'use strict';

module.exports = {
  isObject: function(obj) {
    var type = typeof obj;
    return type === 'function' || type === 'object' && !!obj;
  }

, extend: function(obj) {
    if (!this.isObject(obj)) {
      return obj;
    }
    var source, prop;
    for (var i = 1, length = arguments.length; i < length; i++) {
      source = arguments[i];
      for (prop in source) {
        if (Object.prototype.hasOwnProperty.call(source, prop)) {
          obj[prop] = source[prop];
        }
      }
    }
    return obj;
  }
};

},{}],50:[function(require,module,exports){
'use strict';

var crypto = require('crypto');

// This string has length 32, a power of 2, so the modulus doesn't introduce a
// bias.
var _randomStringChars = 'abcdefghijklmnopqrstuvwxyz012345';
module.exports = {
  string: function(length) {
    var max = _randomStringChars.length;
    var bytes = crypto.randomBytes(length);
    var ret = [];
    for (var i = 0; i < length; i++) {
      ret.push(_randomStringChars.substr(bytes[i] % max, 1));
    }
    return ret.join('');
  }

, number: function(max) {
    return Math.floor(Math.random() * max);
  }

, numberString: function(max) {
    var t = ('' + (max - 1)).length;
    var p = new Array(t + 1).join('0');
    return (p + this.number(max)).slice(-t);
  }
};

},{"crypto":43}],51:[function(require,module,exports){
(function (process){(function (){
'use strict';

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:utils:transport');
}

module.exports = function(availableTransports) {
  return {
    filterToEnabled: function(transportsWhitelist, info) {
      var transports = {
        main: []
      , facade: []
      };
      if (!transportsWhitelist) {
        transportsWhitelist = [];
      } else if (typeof transportsWhitelist === 'string') {
        transportsWhitelist = [transportsWhitelist];
      }

      availableTransports.forEach(function(trans) {
        if (!trans) {
          return;
        }

        if (trans.transportName === 'websocket' && info.websocket === false) {
          debug('disabled from server', 'websocket');
          return;
        }

        if (transportsWhitelist.length &&
            transportsWhitelist.indexOf(trans.transportName) === -1) {
          debug('not in whitelist', trans.transportName);
          return;
        }

        if (trans.enabled(info)) {
          debug('enabled', trans.transportName);
          transports.main.push(trans);
          if (trans.facadeTransport) {
            transports.facade.push(trans.facadeTransport);
          }
        } else {
          debug('disabled', trans.transportName);
        }
      });
      return transports;
    }
  };
};

}).call(this)}).call(this,{ env: {} })

},{"debug":55}],52:[function(require,module,exports){
(function (process){(function (){
'use strict';

var URL = require('url-parse');

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:utils:url');
}

module.exports = {
  getOrigin: function(url) {
    if (!url) {
      return null;
    }

    var p = new URL(url);
    if (p.protocol === 'file:') {
      return null;
    }

    var port = p.port;
    if (!port) {
      port = (p.protocol === 'https:') ? '443' : '80';
    }

    return p.protocol + '//' + p.hostname + ':' + port;
  }

, isOriginEqual: function(a, b) {
    var res = this.getOrigin(a) === this.getOrigin(b);
    debug('same', a, b, res);
    return res;
  }

, isSchemeEqual: function(a, b) {
    return (a.split(':')[0] === b.split(':')[0]);
  }

, addPath: function (url, path) {
    var qs = url.split('?');
    return qs[0] + path + (qs[1] ? '?' + qs[1] : '');
  }

, addQuery: function (url, q) {
    return url + (url.indexOf('?') === -1 ? ('?' + q) : ('&' + q));
  }

, isLoopbackAddr: function (addr) {
    return /^127\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) || /^\[::1\]$/.test(addr);
  }
};

}).call(this)}).call(this,{ env: {} })

},{"debug":55,"url-parse":60}],53:[function(require,module,exports){
module.exports = '1.6.1';

},{}],54:[function(require,module,exports){
/**
 * Helpers.
 */

var s = 1000;
var m = s * 60;
var h = m * 60;
var d = h * 24;
var w = d * 7;
var y = d * 365.25;

/**
 * Parse or format the given `val`.
 *
 * Options:
 *
 *  - `long` verbose formatting [false]
 *
 * @param {String|Number} val
 * @param {Object} [options]
 * @throws {Error} throw an error if val is not a non-empty string or a number
 * @return {String|Number}
 * @api public
 */

module.exports = function(val, options) {
  options = options || {};
  var type = typeof val;
  if (type === 'string' && val.length > 0) {
    return parse(val);
  } else if (type === 'number' && isFinite(val)) {
    return options.long ? fmtLong(val) : fmtShort(val);
  }
  throw new Error(
    'val is not a non-empty string or a valid number. val=' +
      JSON.stringify(val)
  );
};

/**
 * Parse the given `str` and return milliseconds.
 *
 * @param {String} str
 * @return {Number}
 * @api private
 */

function parse(str) {
  str = String(str);
  if (str.length > 100) {
    return;
  }
  var match = /^(-?(?:\d+)?\.?\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|weeks?|w|years?|yrs?|y)?$/i.exec(
    str
  );
  if (!match) {
    return;
  }
  var n = parseFloat(match[1]);
  var type = (match[2] || 'ms').toLowerCase();
  switch (type) {
    case 'years':
    case 'year':
    case 'yrs':
    case 'yr':
    case 'y':
      return n * y;
    case 'weeks':
    case 'week':
    case 'w':
      return n * w;
    case 'days':
    case 'day':
    case 'd':
      return n * d;
    case 'hours':
    case 'hour':
    case 'hrs':
    case 'hr':
    case 'h':
      return n * h;
    case 'minutes':
    case 'minute':
    case 'mins':
    case 'min':
    case 'm':
      return n * m;
    case 'seconds':
    case 'second':
    case 'secs':
    case 'sec':
    case 's':
      return n * s;
    case 'milliseconds':
    case 'millisecond':
    case 'msecs':
    case 'msec':
    case 'ms':
      return n;
    default:
      return undefined;
  }
}

/**
 * Short format for `ms`.
 *
 * @param {Number} ms
 * @return {String}
 * @api private
 */

function fmtShort(ms) {
  var msAbs = Math.abs(ms);
  if (msAbs >= d) {
    return Math.round(ms / d) + 'd';
  }
  if (msAbs >= h) {
    return Math.round(ms / h) + 'h';
  }
  if (msAbs >= m) {
    return Math.round(ms / m) + 'm';
  }
  if (msAbs >= s) {
    return Math.round(ms / s) + 's';
  }
  return ms + 'ms';
}

/**
 * Long format for `ms`.
 *
 * @param {Number} ms
 * @return {String}
 * @api private
 */

function fmtLong(ms) {
  var msAbs = Math.abs(ms);
  if (msAbs >= d) {
    return plural(ms, msAbs, d, 'day');
  }
  if (msAbs >= h) {
    return plural(ms, msAbs, h, 'hour');
  }
  if (msAbs >= m) {
    return plural(ms, msAbs, m, 'minute');
  }
  if (msAbs >= s) {
    return plural(ms, msAbs, s, 'second');
  }
  return ms + ' ms';
}

/**
 * Pluralization helper.
 */

function plural(ms, msAbs, n, name) {
  var isPlural = msAbs >= n * 1.5;
  return Math.round(ms / n) + ' ' + name + (isPlural ? 's' : '');
}

},{}],55:[function(require,module,exports){
(function (process){(function (){
/* eslint-env browser */

/**
 * This is the web browser implementation of `debug()`.
 */

exports.formatArgs = formatArgs;
exports.save = save;
exports.load = load;
exports.useColors = useColors;
exports.storage = localstorage();
exports.destroy = (() => {
	let warned = false;

	return () => {
		if (!warned) {
			warned = true;
			console.warn('Instance method `debug.destroy()` is deprecated and no longer does anything. It will be removed in the next major version of `debug`.');
		}
	};
})();

/**
 * Colors.
 */

exports.colors = [
	'#0000CC',
	'#0000FF',
	'#0033CC',
	'#0033FF',
	'#0066CC',
	'#0066FF',
	'#0099CC',
	'#0099FF',
	'#00CC00',
	'#00CC33',
	'#00CC66',
	'#00CC99',
	'#00CCCC',
	'#00CCFF',
	'#3300CC',
	'#3300FF',
	'#3333CC',
	'#3333FF',
	'#3366CC',
	'#3366FF',
	'#3399CC',
	'#3399FF',
	'#33CC00',
	'#33CC33',
	'#33CC66',
	'#33CC99',
	'#33CCCC',
	'#33CCFF',
	'#6600CC',
	'#6600FF',
	'#6633CC',
	'#6633FF',
	'#66CC00',
	'#66CC33',
	'#9900CC',
	'#9900FF',
	'#9933CC',
	'#9933FF',
	'#99CC00',
	'#99CC33',
	'#CC0000',
	'#CC0033',
	'#CC0066',
	'#CC0099',
	'#CC00CC',
	'#CC00FF',
	'#CC3300',
	'#CC3333',
	'#CC3366',
	'#CC3399',
	'#CC33CC',
	'#CC33FF',
	'#CC6600',
	'#CC6633',
	'#CC9900',
	'#CC9933',
	'#CCCC00',
	'#CCCC33',
	'#FF0000',
	'#FF0033',
	'#FF0066',
	'#FF0099',
	'#FF00CC',
	'#FF00FF',
	'#FF3300',
	'#FF3333',
	'#FF3366',
	'#FF3399',
	'#FF33CC',
	'#FF33FF',
	'#FF6600',
	'#FF6633',
	'#FF9900',
	'#FF9933',
	'#FFCC00',
	'#FFCC33'
];

/**
 * Currently only WebKit-based Web Inspectors, Firefox >= v31,
 * and the Firebug extension (any Firefox version) are known
 * to support "%c" CSS customizations.
 *
 * TODO: add a `localStorage` variable to explicitly enable/disable colors
 */

// eslint-disable-next-line complexity
function useColors() {
	// NB: In an Electron preload script, document will be defined but not fully
	// initialized. Since we know we're in Chrome, we'll just detect this case
	// explicitly
	if (typeof window !== 'undefined' && window.process && (window.process.type === 'renderer' || window.process.__nwjs)) {
		return true;
	}

	// Internet Explorer and Edge do not support colors.
	if (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/(edge|trident)\/(\d+)/)) {
		return false;
	}

	// Is webkit? http://stackoverflow.com/a/16459606/376773
	// document is undefined in react-native: https://github.com/facebook/react-native/pull/1632
	return (typeof document !== 'undefined' && document.documentElement && document.documentElement.style && document.documentElement.style.WebkitAppearance) ||
		// Is firebug? http://stackoverflow.com/a/398120/376773
		(typeof window !== 'undefined' && window.console && (window.console.firebug || (window.console.exception && window.console.table))) ||
		// Is firefox >= v31?
		// https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages
		(typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/) && parseInt(RegExp.$1, 10) >= 31) ||
		// Double check webkit in userAgent just in case we are in a worker
		(typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/applewebkit\/(\d+)/));
}

/**
 * Colorize log arguments if enabled.
 *
 * @api public
 */

function formatArgs(args) {
	args[0] = (this.useColors ? '%c' : '') +
		this.namespace +
		(this.useColors ? ' %c' : ' ') +
		args[0] +
		(this.useColors ? '%c ' : ' ') +
		'+' + module.exports.humanize(this.diff);

	if (!this.useColors) {
		return;
	}

	const c = 'color: ' + this.color;
	args.splice(1, 0, c, 'color: inherit');

	// The final "%c" is somewhat tricky, because there could be other
	// arguments passed either before or after the %c, so we need to
	// figure out the correct index to insert the CSS into
	let index = 0;
	let lastC = 0;
	args[0].replace(/%[a-zA-Z%]/g, match => {
		if (match === '%%') {
			return;
		}
		index++;
		if (match === '%c') {
			// We only are interested in the *last* %c
			// (the user may have provided their own)
			lastC = index;
		}
	});

	args.splice(lastC, 0, c);
}

/**
 * Invokes `console.debug()` when available.
 * No-op when `console.debug` is not a "function".
 * If `console.debug` is not available, falls back
 * to `console.log`.
 *
 * @api public
 */
exports.log = console.debug || console.log || (() => {});

/**
 * Save `namespaces`.
 *
 * @param {String} namespaces
 * @api private
 */
function save(namespaces) {
	try {
		if (namespaces) {
			exports.storage.setItem('debug', namespaces);
		} else {
			exports.storage.removeItem('debug');
		}
	} catch (error) {
		// Swallow
		// XXX (@Qix-) should we be logging these?
	}
}

/**
 * Load `namespaces`.
 *
 * @return {String} returns the previously persisted debug modes
 * @api private
 */
function load() {
	let r;
	try {
		r = exports.storage.getItem('debug');
	} catch (error) {
		// Swallow
		// XXX (@Qix-) should we be logging these?
	}

	// If debug isn't set in LS, and we're in Electron, try to load $DEBUG
	if (!r && typeof process !== 'undefined' && 'env' in process) {
		r = process.env.DEBUG;
	}

	return r;
}

/**
 * Localstorage attempts to return the localstorage.
 *
 * This is necessary because safari throws
 * when a user disables cookies/localstorage
 * and you attempt to access it.
 *
 * @return {LocalStorage}
 * @api private
 */

function localstorage() {
	try {
		// TVMLKit (Apple TV JS Runtime) does not have a window object, just localStorage in the global context
		// The Browser also has localStorage in the global context.
		return localStorage;
	} catch (error) {
		// Swallow
		// XXX (@Qix-) should we be logging these?
	}
}

module.exports = require('./common')(exports);

const {formatters} = module.exports;

/**
 * Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.
 */

formatters.j = function (v) {
	try {
		return JSON.stringify(v);
	} catch (error) {
		return '[UnexpectedJSONParseError]: ' + error.message;
	}
};

}).call(this)}).call(this,{ env: {} })

},{"./common":56}],56:[function(require,module,exports){

/**
 * This is the common logic for both the Node.js and web browser
 * implementations of `debug()`.
 */

function setup(env) {
	createDebug.debug = createDebug;
	createDebug.default = createDebug;
	createDebug.coerce = coerce;
	createDebug.disable = disable;
	createDebug.enable = enable;
	createDebug.enabled = enabled;
	createDebug.humanize = require('ms');
	createDebug.destroy = destroy;

	Object.keys(env).forEach(key => {
		createDebug[key] = env[key];
	});

	/**
	* The currently active debug mode names, and names to skip.
	*/

	createDebug.names = [];
	createDebug.skips = [];

	/**
	* Map of special "%n" handling functions, for the debug "format" argument.
	*
	* Valid key names are a single, lower or upper-case letter, i.e. "n" and "N".
	*/
	createDebug.formatters = {};

	/**
	* Selects a color for a debug namespace
	* @param {String} namespace The namespace string for the debug instance to be colored
	* @return {Number|String} An ANSI color code for the given namespace
	* @api private
	*/
	function selectColor(namespace) {
		let hash = 0;

		for (let i = 0; i < namespace.length; i++) {
			hash = ((hash << 5) - hash) + namespace.charCodeAt(i);
			hash |= 0; // Convert to 32bit integer
		}

		return createDebug.colors[Math.abs(hash) % createDebug.colors.length];
	}
	createDebug.selectColor = selectColor;

	/**
	* Create a debugger with the given `namespace`.
	*
	* @param {String} namespace
	* @return {Function}
	* @api public
	*/
	function createDebug(namespace) {
		let prevTime;
		let enableOverride = null;
		let namespacesCache;
		let enabledCache;

		function debug(...args) {
			// Disabled?
			if (!debug.enabled) {
				return;
			}

			const self = debug;

			// Set `diff` timestamp
			const curr = Number(new Date());
			const ms = curr - (prevTime || curr);
			self.diff = ms;
			self.prev = prevTime;
			self.curr = curr;
			prevTime = curr;

			args[0] = createDebug.coerce(args[0]);

			if (typeof args[0] !== 'string') {
				// Anything else let's inspect with %O
				args.unshift('%O');
			}

			// Apply any `formatters` transformations
			let index = 0;
			args[0] = args[0].replace(/%([a-zA-Z%])/g, (match, format) => {
				// If we encounter an escaped % then don't increase the array index
				if (match === '%%') {
					return '%';
				}
				index++;
				const formatter = createDebug.formatters[format];
				if (typeof formatter === 'function') {
					const val = args[index];
					match = formatter.call(self, val);

					// Now we need to remove `args[index]` since it's inlined in the `format`
					args.splice(index, 1);
					index--;
				}
				return match;
			});

			// Apply env-specific formatting (colors, etc.)
			createDebug.formatArgs.call(self, args);

			const logFn = self.log || createDebug.log;
			logFn.apply(self, args);
		}

		debug.namespace = namespace;
		debug.useColors = createDebug.useColors();
		debug.color = createDebug.selectColor(namespace);
		debug.extend = extend;
		debug.destroy = createDebug.destroy; // XXX Temporary. Will be removed in the next major release.

		Object.defineProperty(debug, 'enabled', {
			enumerable: true,
			configurable: false,
			get: () => {
				if (enableOverride !== null) {
					return enableOverride;
				}
				if (namespacesCache !== createDebug.namespaces) {
					namespacesCache = createDebug.namespaces;
					enabledCache = createDebug.enabled(namespace);
				}

				return enabledCache;
			},
			set: v => {
				enableOverride = v;
			}
		});

		// Env-specific initialization logic for debug instances
		if (typeof createDebug.init === 'function') {
			createDebug.init(debug);
		}

		return debug;
	}

	function extend(namespace, delimiter) {
		const newDebug = createDebug(this.namespace + (typeof delimiter === 'undefined' ? ':' : delimiter) + namespace);
		newDebug.log = this.log;
		return newDebug;
	}

	/**
	* Enables a debug mode by namespaces. This can include modes
	* separated by a colon and wildcards.
	*
	* @param {String} namespaces
	* @api public
	*/
	function enable(namespaces) {
		createDebug.save(namespaces);
		createDebug.namespaces = namespaces;

		createDebug.names = [];
		createDebug.skips = [];

		let i;
		const split = (typeof namespaces === 'string' ? namespaces : '').split(/[\s,]+/);
		const len = split.length;

		for (i = 0; i < len; i++) {
			if (!split[i]) {
				// ignore empty strings
				continue;
			}

			namespaces = split[i].replace(/\*/g, '.*?');

			if (namespaces[0] === '-') {
				createDebug.skips.push(new RegExp('^' + namespaces.substr(1) + '$'));
			} else {
				createDebug.names.push(new RegExp('^' + namespaces + '$'));
			}
		}
	}

	/**
	* Disable debug output.
	*
	* @return {String} namespaces
	* @api public
	*/
	function disable() {
		const namespaces = [
			...createDebug.names.map(toNamespace),
			...createDebug.skips.map(toNamespace).map(namespace => '-' + namespace)
		].join(',');
		createDebug.enable('');
		return namespaces;
	}

	/**
	* Returns true if the given mode name is enabled, false otherwise.
	*
	* @param {String} name
	* @return {Boolean}
	* @api public
	*/
	function enabled(name) {
		if (name[name.length - 1] === '*') {
			return true;
		}

		let i;
		let len;

		for (i = 0, len = createDebug.skips.length; i < len; i++) {
			if (createDebug.skips[i].test(name)) {
				return false;
			}
		}

		for (i = 0, len = createDebug.names.length; i < len; i++) {
			if (createDebug.names[i].test(name)) {
				return true;
			}
		}

		return false;
	}

	/**
	* Convert regexp to namespace
	*
	* @param {RegExp} regxep
	* @return {String} namespace
	* @api private
	*/
	function toNamespace(regexp) {
		return regexp.toString()
			.substring(2, regexp.toString().length - 2)
			.replace(/\.\*\?$/, '*');
	}

	/**
	* Coerce `val`.
	*
	* @param {Mixed} val
	* @return {Mixed}
	* @api private
	*/
	function coerce(val) {
		if (val instanceof Error) {
			return val.stack || val.message;
		}
		return val;
	}

	/**
	* XXX DO NOT USE. This is a temporary stub function.
	* XXX It WILL be removed in the next major release.
	*/
	function destroy() {
		console.warn('Instance method `debug.destroy()` is deprecated and no longer does anything. It will be removed in the next major version of `debug`.');
	}

	createDebug.enable(createDebug.load());

	return createDebug;
}

module.exports = setup;

},{"ms":54}],57:[function(require,module,exports){
if (typeof Object.create === 'function') {
  // implementation from standard node.js 'util' module
  module.exports = function inherits(ctor, superCtor) {
    if (superCtor) {
      ctor.super_ = superCtor
      ctor.prototype = Object.create(superCtor.prototype, {
        constructor: {
          value: ctor,
          enumerable: false,
          writable: true,
          configurable: true
        }
      })
    }
  };
} else {
  // old school shim for old browsers
  module.exports = function inherits(ctor, superCtor) {
    if (superCtor) {
      ctor.super_ = superCtor
      var TempCtor = function () {}
      TempCtor.prototype = superCtor.prototype
      ctor.prototype = new TempCtor()
      ctor.prototype.constructor = ctor
    }
  }
}

},{}],58:[function(require,module,exports){
'use strict';

var has = Object.prototype.hasOwnProperty
  , undef;

/**
 * Decode a URI encoded string.
 *
 * @param {String} input The URI encoded string.
 * @returns {String|Null} The decoded string.
 * @api private
 */
function decode(input) {
  try {
    return decodeURIComponent(input.replace(/\+/g, ' '));
  } catch (e) {
    return null;
  }
}

/**
 * Attempts to encode a given input.
 *
 * @param {String} input The string that needs to be encoded.
 * @returns {String|Null} The encoded string.
 * @api private
 */
function encode(input) {
  try {
    return encodeURIComponent(input);
  } catch (e) {
    return null;
  }
}

/**
 * Simple query string parser.
 *
 * @param {String} query The query string that needs to be parsed.
 * @returns {Object}
 * @api public
 */
function querystring(query) {
  var parser = /([^=?&]+)=?([^&]*)/g
    , result = {}
    , part;

  while (part = parser.exec(query)) {
    var key = decode(part[1])
      , value = decode(part[2]);

    //
    // Prevent overriding of existing properties. This ensures that build-in
    // methods like `toString` or __proto__ are not overriden by malicious
    // querystrings.
    //
    // In the case if failed decoding, we want to omit the key/value pairs
    // from the result.
    //
    if (key === null || value === null || key in result) continue;
    result[key] = value;
  }

  return result;
}

/**
 * Transform a query string to an object.
 *
 * @param {Object} obj Object that should be transformed.
 * @param {String} prefix Optional prefix.
 * @returns {String}
 * @api public
 */
function querystringify(obj, prefix) {
  prefix = prefix || '';

  var pairs = []
    , value
    , key;

  //
  // Optionally prefix with a '?' if needed
  //
  if ('string' !== typeof prefix) prefix = '?';

  for (key in obj) {
    if (has.call(obj, key)) {
      value = obj[key];

      //
      // Edge cases where we actually want to encode the value to an empty
      // string instead of the stringified value.
      //
      if (!value && (value === null || value === undef || isNaN(value))) {
        value = '';
      }

      key = encodeURIComponent(key);
      value = encodeURIComponent(value);

      //
      // If we failed to encode the strings, we should bail out as we don't
      // want to add invalid strings to the query.
      //
      if (key === null || value === null) continue;
      pairs.push(key +'='+ value);
    }
  }

  return pairs.length ? prefix + pairs.join('&') : '';
}

//
// Expose the module.
//
exports.stringify = querystringify;
exports.parse = querystring;

},{}],59:[function(require,module,exports){
'use strict';

/**
 * Check if we're required to add a port number.
 *
 * @see https://url.spec.whatwg.org/#default-port
 * @param {Number|String} port Port number we need to check
 * @param {String} protocol Protocol we need to check against.
 * @returns {Boolean} Is it a default port for the given protocol
 * @api private
 */
module.exports = function required(port, protocol) {
  protocol = protocol.split(':')[0];
  port = +port;

  if (!port) return false;

  switch (protocol) {
    case 'http':
    case 'ws':
    return port !== 80;

    case 'https':
    case 'wss':
    return port !== 443;

    case 'ftp':
    return port !== 21;

    case 'gopher':
    return port !== 70;

    case 'file':
    return false;
  }

  return port !== 0;
};

},{}],60:[function(require,module,exports){
(function (global){(function (){
'use strict';

var required = require('requires-port')
  , qs = require('querystringify')
  , controlOrWhitespace = /^[\x00-\x20\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff]+/
  , CRHTLF = /[\n\r\t]/g
  , slashes = /^[A-Za-z][A-Za-z0-9+-.]*:\/\//
  , port = /:\d+$/
  , protocolre = /^([a-z][a-z0-9.+-]*:)?(\/\/)?([\\/]+)?([\S\s]*)/i
  , windowsDriveLetter = /^[a-zA-Z]:/;

/**
 * Remove control characters and whitespace from the beginning of a string.
 *
 * @param {Object|String} str String to trim.
 * @returns {String} A new string representing `str` stripped of control
 *     characters and whitespace from its beginning.
 * @public
 */
function trimLeft(str) {
  return (str ? str : '').toString().replace(controlOrWhitespace, '');
}

/**
 * These are the parse rules for the URL parser, it informs the parser
 * about:
 *
 * 0. The char it Needs to parse, if it's a string it should be done using
 *    indexOf, RegExp using exec and NaN means set as current value.
 * 1. The property we should set when parsing this value.
 * 2. Indication if it's backwards or forward parsing, when set as number it's
 *    the value of extra chars that should be split off.
 * 3. Inherit from location if non existing in the parser.
 * 4. `toLowerCase` the resulting value.
 */
var rules = [
  ['#', 'hash'],                        // Extract from the back.
  ['?', 'query'],                       // Extract from the back.
  function sanitize(address, url) {     // Sanitize what is left of the address
    return isSpecial(url.protocol) ? address.replace(/\\/g, '/') : address;
  },
  ['/', 'pathname'],                    // Extract from the back.
  ['@', 'auth', 1],                     // Extract from the front.
  [NaN, 'host', undefined, 1, 1],       // Set left over value.
  [/:(\d*)$/, 'port', undefined, 1],    // RegExp the back.
  [NaN, 'hostname', undefined, 1, 1]    // Set left over.
];

/**
 * These properties should not be copied or inherited from. This is only needed
 * for all non blob URL's as a blob URL does not include a hash, only the
 * origin.
 *
 * @type {Object}
 * @private
 */
var ignore = { hash: 1, query: 1 };

/**
 * The location object differs when your code is loaded through a normal page,
 * Worker or through a worker using a blob. And with the blobble begins the
 * trouble as the location object will contain the URL of the blob, not the
 * location of the page where our code is loaded in. The actual origin is
 * encoded in the `pathname` so we can thankfully generate a good "default"
 * location from it so we can generate proper relative URL's again.
 *
 * @param {Object|String} loc Optional default location object.
 * @returns {Object} lolcation object.
 * @public
 */
function lolcation(loc) {
  var globalVar;

  if (typeof window !== 'undefined') globalVar = window;
  else if (typeof global !== 'undefined') globalVar = global;
  else if (typeof self !== 'undefined') globalVar = self;
  else globalVar = {};

  var location = globalVar.location || {};
  loc = loc || location;

  var finaldestination = {}
    , type = typeof loc
    , key;

  if ('blob:' === loc.protocol) {
    finaldestination = new Url(unescape(loc.pathname), {});
  } else if ('string' === type) {
    finaldestination = new Url(loc, {});
    for (key in ignore) delete finaldestination[key];
  } else if ('object' === type) {
    for (key in loc) {
      if (key in ignore) continue;
      finaldestination[key] = loc[key];
    }

    if (finaldestination.slashes === undefined) {
      finaldestination.slashes = slashes.test(loc.href);
    }
  }

  return finaldestination;
}

/**
 * Check whether a protocol scheme is special.
 *
 * @param {String} The protocol scheme of the URL
 * @return {Boolean} `true` if the protocol scheme is special, else `false`
 * @private
 */
function isSpecial(scheme) {
  return (
    scheme === 'file:' ||
    scheme === 'ftp:' ||
    scheme === 'http:' ||
    scheme === 'https:' ||
    scheme === 'ws:' ||
    scheme === 'wss:'
  );
}

/**
 * @typedef ProtocolExtract
 * @type Object
 * @property {String} protocol Protocol matched in the URL, in lowercase.
 * @property {Boolean} slashes `true` if protocol is followed by "//", else `false`.
 * @property {String} rest Rest of the URL that is not part of the protocol.
 */

/**
 * Extract protocol information from a URL with/without double slash ("//").
 *
 * @param {String} address URL we want to extract from.
 * @param {Object} location
 * @return {ProtocolExtract} Extracted information.
 * @private
 */
function extractProtocol(address, location) {
  address = trimLeft(address);
  address = address.replace(CRHTLF, '');
  location = location || {};

  var match = protocolre.exec(address);
  var protocol = match[1] ? match[1].toLowerCase() : '';
  var forwardSlashes = !!match[2];
  var otherSlashes = !!match[3];
  var slashesCount = 0;
  var rest;

  if (forwardSlashes) {
    if (otherSlashes) {
      rest = match[2] + match[3] + match[4];
      slashesCount = match[2].length + match[3].length;
    } else {
      rest = match[2] + match[4];
      slashesCount = match[2].length;
    }
  } else {
    if (otherSlashes) {
      rest = match[3] + match[4];
      slashesCount = match[3].length;
    } else {
      rest = match[4]
    }
  }

  if (protocol === 'file:') {
    if (slashesCount >= 2) {
      rest = rest.slice(2);
    }
  } else if (isSpecial(protocol)) {
    rest = match[4];
  } else if (protocol) {
    if (forwardSlashes) {
      rest = rest.slice(2);
    }
  } else if (slashesCount >= 2 && isSpecial(location.protocol)) {
    rest = match[4];
  }

  return {
    protocol: protocol,
    slashes: forwardSlashes || isSpecial(protocol),
    slashesCount: slashesCount,
    rest: rest
  };
}

/**
 * Resolve a relative URL pathname against a base URL pathname.
 *
 * @param {String} relative Pathname of the relative URL.
 * @param {String} base Pathname of the base URL.
 * @return {String} Resolved pathname.
 * @private
 */
function resolve(relative, base) {
  if (relative === '') return base;

  var path = (base || '/').split('/').slice(0, -1).concat(relative.split('/'))
    , i = path.length
    , last = path[i - 1]
    , unshift = false
    , up = 0;

  while (i--) {
    if (path[i] === '.') {
      path.splice(i, 1);
    } else if (path[i] === '..') {
      path.splice(i, 1);
      up++;
    } else if (up) {
      if (i === 0) unshift = true;
      path.splice(i, 1);
      up--;
    }
  }

  if (unshift) path.unshift('');
  if (last === '.' || last === '..') path.push('');

  return path.join('/');
}

/**
 * The actual URL instance. Instead of returning an object we've opted-in to
 * create an actual constructor as it's much more memory efficient and
 * faster and it pleases my OCD.
 *
 * It is worth noting that we should not use `URL` as class name to prevent
 * clashes with the global URL instance that got introduced in browsers.
 *
 * @constructor
 * @param {String} address URL we want to parse.
 * @param {Object|String} [location] Location defaults for relative paths.
 * @param {Boolean|Function} [parser] Parser for the query string.
 * @private
 */
function Url(address, location, parser) {
  address = trimLeft(address);
  address = address.replace(CRHTLF, '');

  if (!(this instanceof Url)) {
    return new Url(address, location, parser);
  }

  var relative, extracted, parse, instruction, index, key
    , instructions = rules.slice()
    , type = typeof location
    , url = this
    , i = 0;

  //
  // The following if statements allows this module two have compatibility with
  // 2 different API:
  //
  // 1. Node.js's `url.parse` api which accepts a URL, boolean as arguments
  //    where the boolean indicates that the query string should also be parsed.
  //
  // 2. The `URL` interface of the browser which accepts a URL, object as
  //    arguments. The supplied object will be used as default values / fall-back
  //    for relative paths.
  //
  if ('object' !== type && 'string' !== type) {
    parser = location;
    location = null;
  }

  if (parser && 'function' !== typeof parser) parser = qs.parse;

  location = lolcation(location);

  //
  // Extract protocol information before running the instructions.
  //
  extracted = extractProtocol(address || '', location);
  relative = !extracted.protocol && !extracted.slashes;
  url.slashes = extracted.slashes || relative && location.slashes;
  url.protocol = extracted.protocol || location.protocol || '';
  address = extracted.rest;

  //
  // When the authority component is absent the URL starts with a path
  // component.
  //
  if (
    extracted.protocol === 'file:' && (
      extracted.slashesCount !== 2 || windowsDriveLetter.test(address)) ||
    (!extracted.slashes &&
      (extracted.protocol ||
        extracted.slashesCount < 2 ||
        !isSpecial(url.protocol)))
  ) {
    instructions[3] = [/(.*)/, 'pathname'];
  }

  for (; i < instructions.length; i++) {
    instruction = instructions[i];

    if (typeof instruction === 'function') {
      address = instruction(address, url);
      continue;
    }

    parse = instruction[0];
    key = instruction[1];

    if (parse !== parse) {
      url[key] = address;
    } else if ('string' === typeof parse) {
      index = parse === '@'
        ? address.lastIndexOf(parse)
        : address.indexOf(parse);

      if (~index) {
        if ('number' === typeof instruction[2]) {
          url[key] = address.slice(0, index);
          address = address.slice(index + instruction[2]);
        } else {
          url[key] = address.slice(index);
          address = address.slice(0, index);
        }
      }
    } else if ((index = parse.exec(address))) {
      url[key] = index[1];
      address = address.slice(0, index.index);
    }

    url[key] = url[key] || (
      relative && instruction[3] ? location[key] || '' : ''
    );

    //
    // Hostname, host and protocol should be lowercased so they can be used to
    // create a proper `origin`.
    //
    if (instruction[4]) url[key] = url[key].toLowerCase();
  }

  //
  // Also parse the supplied query string in to an object. If we're supplied
  // with a custom parser as function use that instead of the default build-in
  // parser.
  //
  if (parser) url.query = parser(url.query);

  //
  // If the URL is relative, resolve the pathname against the base URL.
  //
  if (
      relative
    && location.slashes
    && url.pathname.charAt(0) !== '/'
    && (url.pathname !== '' || location.pathname !== '')
  ) {
    url.pathname = resolve(url.pathname, location.pathname);
  }

  //
  // Default to a / for pathname if none exists. This normalizes the URL
  // to always have a /
  //
  if (url.pathname.charAt(0) !== '/' && isSpecial(url.protocol)) {
    url.pathname = '/' + url.pathname;
  }

  //
  // We should not add port numbers if they are already the default port number
  // for a given protocol. As the host also contains the port number we're going
  // override it with the hostname which contains no port number.
  //
  if (!required(url.port, url.protocol)) {
    url.host = url.hostname;
    url.port = '';
  }

  //
  // Parse down the `auth` for the username and password.
  //
  url.username = url.password = '';

  if (url.auth) {
    index = url.auth.indexOf(':');

    if (~index) {
      url.username = url.auth.slice(0, index);
      url.username = encodeURIComponent(decodeURIComponent(url.username));

      url.password = url.auth.slice(index + 1);
      url.password = encodeURIComponent(decodeURIComponent(url.password))
    } else {
      url.username = encodeURIComponent(decodeURIComponent(url.auth));
    }

    url.auth = url.password ? url.username +':'+ url.password : url.username;
  }

  url.origin = url.protocol !== 'file:' && isSpecial(url.protocol) && url.host
    ? url.protocol +'//'+ url.host
    : 'null';

  //
  // The href is just the compiled result.
  //
  url.href = url.toString();
}

/**
 * This is convenience method for changing properties in the URL instance to
 * insure that they all propagate correctly.
 *
 * @param {String} part          Property we need to adjust.
 * @param {Mixed} value          The newly assigned value.
 * @param {Boolean|Function} fn  When setting the query, it will be the function
 *                               used to parse the query.
 *                               When setting the protocol, double slash will be
 *                               removed from the final url if it is true.
 * @returns {URL} URL instance for chaining.
 * @public
 */
function set(part, value, fn) {
  var url = this;

  switch (part) {
    case 'query':
      if ('string' === typeof value && value.length) {
        value = (fn || qs.parse)(value);
      }

      url[part] = value;
      break;

    case 'port':
      url[part] = value;

      if (!required(value, url.protocol)) {
        url.host = url.hostname;
        url[part] = '';
      } else if (value) {
        url.host = url.hostname +':'+ value;
      }

      break;

    case 'hostname':
      url[part] = value;

      if (url.port) value += ':'+ url.port;
      url.host = value;
      break;

    case 'host':
      url[part] = value;

      if (port.test(value)) {
        value = value.split(':');
        url.port = value.pop();
        url.hostname = value.join(':');
      } else {
        url.hostname = value;
        url.port = '';
      }

      break;

    case 'protocol':
      url.protocol = value.toLowerCase();
      url.slashes = !fn;
      break;

    case 'pathname':
    case 'hash':
      if (value) {
        var char = part === 'pathname' ? '/' : '#';
        url[part] = value.charAt(0) !== char ? char + value : value;
      } else {
        url[part] = value;
      }
      break;

    case 'username':
    case 'password':
      url[part] = encodeURIComponent(value);
      break;

    case 'auth':
      var index = value.indexOf(':');

      if (~index) {
        url.username = value.slice(0, index);
        url.username = encodeURIComponent(decodeURIComponent(url.username));

        url.password = value.slice(index + 1);
        url.password = encodeURIComponent(decodeURIComponent(url.password));
      } else {
        url.username = encodeURIComponent(decodeURIComponent(value));
      }
  }

  for (var i = 0; i < rules.length; i++) {
    var ins = rules[i];

    if (ins[4]) url[ins[1]] = url[ins[1]].toLowerCase();
  }

  url.auth = url.password ? url.username +':'+ url.password : url.username;

  url.origin = url.protocol !== 'file:' && isSpecial(url.protocol) && url.host
    ? url.protocol +'//'+ url.host
    : 'null';

  url.href = url.toString();

  return url;
}

/**
 * Transform the properties back in to a valid and full URL string.
 *
 * @param {Function} stringify Optional query stringify function.
 * @returns {String} Compiled version of the URL.
 * @public
 */
function toString(stringify) {
  if (!stringify || 'function' !== typeof stringify) stringify = qs.stringify;

  var query
    , url = this
    , host = url.host
    , protocol = url.protocol;

  if (protocol && protocol.charAt(protocol.length - 1) !== ':') protocol += ':';

  var result =
    protocol +
    ((url.protocol && url.slashes) || isSpecial(url.protocol) ? '//' : '');

  if (url.username) {
    result += url.username;
    if (url.password) result += ':'+ url.password;
    result += '@';
  } else if (url.password) {
    result += ':'+ url.password;
    result += '@';
  } else if (
    url.protocol !== 'file:' &&
    isSpecial(url.protocol) &&
    !host &&
    url.pathname !== '/'
  ) {
    //
    // Add back the empty userinfo, otherwise the original invalid URL
    // might be transformed into a valid one with `url.pathname` as host.
    //
    result += '@';
  }

  //
  // Trailing colon is removed from `url.host` when it is parsed. If it still
  // ends with a colon, then add back the trailing colon that was removed. This
  // prevents an invalid URL from being transformed into a valid one.
  //
  if (host[host.length - 1] === ':' || (port.test(url.hostname) && !url.port)) {
    host += ':';
  }

  result += host + url.pathname;

  query = 'object' === typeof url.query ? stringify(url.query) : url.query;
  if (query) result += '?' !== query.charAt(0) ? '?'+ query : query;

  if (url.hash) result += url.hash;

  return result;
}

Url.prototype = { set: set, toString: toString };

//
// Expose the URL parser and some additional properties that might be useful for
// others or testing.
//
Url.extractProtocol = extractProtocol;
Url.location = lolcation;
Url.trimLeft = trimLeft;
Url.qs = qs;

module.exports = Url;

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})

},{"querystringify":58,"requires-port":59}]},{},[1])(1)
});


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