jquery.atmosphere.js

/**
 * Copyright 2013 Jeanfrancois Arcand
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * IE streaming/XDR supports is copied/highly inspired by http://code.google.com/p/jquery-stream/
 *
 * Copyright 2011, Donghwan Kim
 * Licensed under the Apache License, Version 2.0
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * LocalStorage supports is copied/highly inspired by https://github.com/flowersinthesand/jquery-socket
 * Copyright 2011, Donghwan Kim
 * Licensed under the Apache License, Version 2.0
 * http://www.apache.org/licenses/LICENSE-2.0
 * */
/**
 * Official documentation of this library: https://github.com/Atmosphere/atmosphere/wiki/jQuery.atmosphere.js-API
 */
jQuery.atmosphere = function () {

    jQuery(window).bind("unload.atmosphere", function () {
        jQuery.atmosphere.unsubscribe();
    });

    jQuery(window).bind("offline", function () {
        jQuery.atmosphere.unsubscribe();
    });

    // Prevent ESC to kill the connection from Firefox.
    jQuery(window).keypress(function (e) {
        if (e.keyCode === 27) {
            e.preventDefault();
        }
    });

    var parseHeaders = function (headerString) {
        var match, rheaders = /^(.*?):[ \t]*([^\r\n]*)\r?$/mg, headers = {};
        while (match = rheaders.exec(headerString)) {
            headers[match[1]] = match[2];
        }
        return headers;
    };

    return {
        version: "2.1.2-jquery",
        uuid : 0,
        requests: [],
        callbacks: [],

        onError: function (response) {
        },
        onClose: function (response) {
        },
        onOpen: function (response) {
        },
        onMessage: function (response) {
        },
        onReconnect: function (request, response) {
        },
        onMessagePublished: function (response) {
        },
        onTransportFailure: function (errorMessage, _request) {
        },
        onLocalMessage: function (response) {
        },
        onClientTimeout: function(request){
        },
        onFailureToReconnect: function (request, response) {
        },

        AtmosphereRequest: function (options) {

            /**
             * {Object} Request parameters.
             *
             * @private
             */
            var _request = {
                timeout: 300000,
                method: 'GET',
                headers: {},
                contentType: '',
                callback: null,
                url: '',
                data: '',
                suspend: true,
                maxRequest: -1,
                reconnect: true,
                maxStreamingLength: 10000000,
                lastIndex: 0,
                logLevel: 'info',
                requestCount: 0,
                fallbackMethod: 'GET',
                fallbackTransport: 'streaming',
                transport: 'long-polling',
                webSocketImpl: null,
                webSocketBinaryType: null,
                dispatchUrl: null,
                webSocketPathDelimiter: "@@",
                enableXDR: false,
                rewriteURL: false,
                attachHeadersAsQueryString: true,
                executeCallbackBeforeReconnect: false,
                readyState: 0,
                lastTimestamp: 0,
                withCredentials: false,
                trackMessageLength: false,
                messageDelimiter: '|',
                connectTimeout: -1,
                reconnectInterval: 0,
                dropHeaders: true,
                uuid: 0,
                shared: false,
                readResponsesHeaders: false,
                maxReconnectOnClose: 5,
                enableProtocol: true,
                onError: function (response) {
                },
                onClose: function (response) {
                },
                onOpen: function (response) {
                },
                onMessage: function (response) {
                },
                onReopen: function (request, response) {
                },
                onReconnect: function (request, response) {
                },
                onMessagePublished: function (response) {
                },
                onTransportFailure: function (reason, request) {
                },
                onLocalMessage: function (request) {
                },
                onFailureToReconnect: function (request, response) {
                },
                onClientTimeout: function(request){
                }
            };

            /**
             * {Object} Request's last response.
             *
             * @private
             */
            var _response = {
                status: 200,
                reasonPhrase: "OK",
                responseBody: '',
                messages: [],
                headers: [],
                state: "messageReceived",
                transport: "polling",
                error: null,
                request: null,
                partialMessage: "",
                errorHandled: false,
                closedByClientTimeout: false
            };

            /**
             * {websocket} Opened web socket.
             *
             * @private
             */
            var _websocket = null;

            /**
             * {SSE} Opened SSE.
             *
             * @private
             */
            var _sse = null;

            /**
             * {XMLHttpRequest, ActiveXObject} Opened ajax request (in case of http-streaming or long-polling)
             *
             * @private
             */
            var _activeRequest = null;

            /**
             * {Object} Object use for streaming with IE.
             *
             * @private
             */
            var _ieStream = null;

            /**
             * {Object} Object use for jsonp transport.
             *
             * @private
             */
            var _jqxhr = null;

            /**
             * {boolean} If request has been subscribed or not.
             *
             * @private
             */
            var _subscribed = true;

            /**
             * {number} Number of test reconnection.
             *
             * @private
             */
            var _requestCount = 0;

            /**
             * {boolean} If request is currently aborded.
             *
             * @private
             */
            var _abordingConnection = false;

            /**
             * A local "channel' of communication.
             *
             * @private
             */
            var _localSocketF = null;

            /**
             * The storage used.
             *
             * @private
             */
            var _storageService;

            /**
             * Local communication
             *
             * @private
             */
            var _localStorageService = null;

            /**
             * A Unique ID
             *
             * @private
             */
            var guid = jQuery.now();

            /** Trace time */
            var _traceTimer;

            /** Key for connection sharing */
            var _sharingKey;

            // Automatic call to subscribe
            _subscribe(options);

            /**
             * Initialize atmosphere request object.
             *
             * @private
             */
            function _init() {
                _subscribed = true;
                _abordingConnection = false;
                _requestCount = 0;

                _websocket = null;
                _sse = null;
                _activeRequest = null;
                _ieStream = null;
            }

            /**
             * Re-initialize atmosphere object.
             *
             * @private
             */
            function _reinit() {
                _clearState();
                _init();
            }

            /**
             * Subscribe request using request transport. <br>
             * If request is currently opened, this one will be closed.
             *
             * @param {Object} Request parameters.
             * @private
             */
            function _subscribe(options) {
                _reinit();

                _request = jQuery.extend(_request, options);
                // Allow at least 1 request
                _request.mrequest = _request.reconnect;
                if (!_request.reconnect) {
                    _request.reconnect = true;
                }
            }

            /**
             * Check if web socket is supported (check for custom implementation provided by request object or browser implementation).
             *
             * @returns {boolean} True if web socket is supported, false otherwise.
             * @private
             */
            function _supportWebsocket() {
                return _request.webSocketImpl != null || window.WebSocket || window.MozWebSocket;
            }

            /**
             * Check if server side events (SSE) is supported (check for custom implementation provided by request object or browser implementation).
             *
             * @returns {boolean} True if web socket is supported, false otherwise.
             * @private
             */
            function _supportSSE() {
                return window.EventSource;
            }

            /**
             * Open request using request transport. <br>
             * If request transport is 'websocket' but websocket can't be opened, request will automatically reconnect using fallback transport.
             *
             * @private
             */
            function _execute() {
                // Shared across multiple tabs/windows.
                if (_request.shared) {
                    _localStorageService = _local(_request);
                    if (_localStorageService != null) {
                        if (_request.logLevel === 'debug') {
                            jQuery.atmosphere.debug("Storage service available. All communication will be local");
                        }

                        if (_localStorageService.open(_request)) {
                            // Local connection.
                            return;
                        }
                    }

                    if (_request.logLevel === 'debug') {
                        jQuery.atmosphere.debug("No Storage service available.");
                    }
                    // Wasn't local or an error occurred
                    _localStorageService = null;
                }

                // Protocol
                _request.firstMessage = jQuery.atmosphere.uuid == 0 ? true : false;
                _request.isOpen = false;
                _request.ctime = jQuery.now();

                // We carry any UUID set by the user or from a previous connection.
                if (_request.uuid === 0) {
                    _request.uuid = jQuery.atmosphere.uuid;
                }
                _request.closedByClientTimeout = false;

                if (_request.transport !== 'websocket' && _request.transport !== 'sse') {
                    _executeRequest(_request);

                } else if (_request.transport === 'websocket') {
                    if (!_supportWebsocket()) {
                        _reconnectWithFallbackTransport("Websocket is not supported, using request.fallbackTransport (" + _request.fallbackTransport
                            + ")");
                    } else {
                        _executeWebSocket(false);
                    }
                } else if (_request.transport === 'sse') {
                    if (!_supportSSE()) {
                        _reconnectWithFallbackTransport("Server Side Events(SSE) is not supported, using request.fallbackTransport ("
                            + _request.fallbackTransport + ")");
                    } else {
                        _executeSSE(false);
                    }
                }
            }

            function _local(request) {
                var trace, connector, orphan, name = "atmosphere-" + request.url, connectors = {
                    storage: function () {
                        if (!jQuery.atmosphere.supportStorage()) {
                            return;
                        }

                        var storage = window.localStorage, get = function (key) {
                            return jQuery.parseJSON(storage.getItem(name + "-" + key));
                        }, set = function (key, value) {
                            storage.setItem(name + "-" + key, jQuery.stringifyJSON(value));
                        };

                        return {
                            init: function () {
                                set("children", get("children").concat([guid]));
                                jQuery(window).on("storage.socket", function (event) {
                                    event = event.originalEvent;
                                    if (event.key === name && event.newValue) {
                                        listener(event.newValue);
                                    }
                                });
                                return get("opened");
                            },
                            signal: function (type, data) {
                                storage.setItem(name, jQuery.stringifyJSON({
                                    target: "p",
                                    type: type,
                                    data: data
                                }));
                            },
                            close: function () {
                                var index, children = get("children");

                                jQuery(window).off("storage.socket");
                                if (children) {
                                    index = jQuery.inArray(request.id, children);
                                    if (index > -1) {
                                        children.splice(index, 1);
                                        set("children", children);
                                    }
                                }
                            }
                        };
                    },
                    windowref: function () {
                        var win = window.open("", name.replace(/\W/g, ""));

                        if (!win || win.closed || !win.callbacks) {
                            return;
                        }

                        return {
                            init: function () {
                                win.callbacks.push(listener);
                                win.children.push(guid);
                                return win.opened;
                            },
                            signal: function (type, data) {
                                if (!win.closed && win.fire) {
                                    win.fire(jQuery.stringifyJSON({
                                        target: "p",
                                        type: type,
                                        data: data
                                    }));
                                }
                            },
                            close: function () {
                                function remove(array, e) {
                                    var index = jQuery.inArray(e, array);
                                    if (index > -1) {
                                        array.splice(index, 1);
                                    }
                                }

                                // Removes traces only if the parent is alive
                                if (!orphan) {
                                    remove(win.callbacks, listener);
                                    remove(win.children, guid);
                                }
                            }

                        };
                    }
                };

                // Receives open, close and message command from the parent
                function listener(string) {
                    var command = jQuery.parseJSON(string), data = command.data;

                    if (command.target === "c") {
                        switch (command.type) {
                            case "open":
                                _open("opening", 'local', _request);
                                break;
                            case "close":
                                if (!orphan) {
                                    orphan = true;
                                    if (data.reason === "aborted") {
                                        _close();
                                    } else {
                                        // Gives the heir some time to reconnect
                                        if (data.heir === guid) {
                                            _execute();
                                        } else {
                                            setTimeout(function () {
                                                _execute();
                                            }, 100);
                                        }
                                    }
                                }
                                break;
                            case "message":
                                _prepareCallback(data, "messageReceived", 200, request.transport);
                                break;
                            case "localMessage":
                                _localMessage(data);
                                break;
                        }
                    }
                }

                function findTrace() {
                    var matcher = new RegExp("(?:^|; )(" + encodeURIComponent(name) + ")=([^;]*)").exec(document.cookie);
                    if (matcher) {
                        return jQuery.parseJSON(decodeURIComponent(matcher[2]));
                    }
                }

                // Finds and validates the parent socket's trace from the cookie
                trace = findTrace();
                if (!trace || jQuery.now() - trace.ts > 1000) {
                    return;
                }

                // Chooses a connector
                connector = connectors.storage() || connectors.windowref();
                if (!connector) {
                    return;
                }

                return {
                    open: function () {
                        var parentOpened;

                        // Checks the shared one is alive
                        _traceTimer = setInterval(function () {
                            var oldTrace = trace;
                            trace = findTrace();
                            if (!trace || oldTrace.ts === trace.ts) {
                                // Simulates a close signal
                                listener(jQuery.stringifyJSON({
                                    target: "c",
                                    type: "close",
                                    data: {
                                        reason: "error",
                                        heir: oldTrace.heir
                                    }
                                }));
                            }
                        }, 1000);

                        parentOpened = connector.init();
                        if (parentOpened) {
                            // Firing the open event without delay robs the user of the opportunity to bind connecting event handlers
                            setTimeout(function () {
                                _open("opening", 'local', request);
                            }, 50);
                        }
                        return parentOpened;
                    },
                    send: function (event) {
                        connector.signal("send", event);
                    },
                    localSend: function (event) {
                        connector.signal("localSend", jQuery.stringifyJSON({
                            id: guid,
                            event: event
                        }));
                    },
                    close: function () {
                        // Do not signal the parent if this method is executed by the unload event handler
                        if (!_abordingConnection) {
                            clearInterval(_traceTimer);
                            connector.signal("close");
                            connector.close();
                        }
                    }
                };
            }

            function share() {
                var storageService, name = "atmosphere-" + _request.url, servers = {
                    // Powered by the storage event and the localStorage
                    // http://www.w3.org/TR/webstorage/#event-storage
                    storage: function () {
                        if (!jQuery.atmosphere.supportStorage()) {
                            return;
                        }

                        var storage = window.localStorage;

                        return {
                            init: function () {
                                // Handles the storage event
                                jQuery(window).on("storage.socket", function (event) {
                                    event = event.originalEvent;
                                    // When a deletion, newValue initialized to null
                                    if (event.key === name && event.newValue) {
                                        listener(event.newValue);
                                    }
                                });
                            },
                            signal: function (type, data) {
                                storage.setItem(name, jQuery.stringifyJSON({
                                    target: "c",
                                    type: type,
                                    data: data
                                }));
                            },
                            get: function (key) {
                                return jQuery.parseJSON(storage.getItem(name + "-" + key));
                            },
                            set: function (key, value) {
                                storage.setItem(name + "-" + key, jQuery.stringifyJSON(value));
                            },
                            close: function () {
                                jQuery(window).off("storage.socket");
                                storage.removeItem(name);
                                storage.removeItem(name + "-opened");
                                storage.removeItem(name + "-children");
                            }

                        };
                    },
                    // Powered by the window.open method
                    // https://developer.mozilla.org/en/DOM/window.open
                    windowref: function () {
                        // Internet Explorer raises an invalid argument error
                        // when calling the window.open method with the name containing non-word characters
                        var neim = name.replace(/\W/g, ""), win = (jQuery('iframe[name="' + neim + '"]')[0] || jQuery(
                            '<iframe name="' + neim + '" />').hide().appendTo("body")[0]).contentWindow;

                        return {
                            init: function () {
                                // Callbacks from different windows
                                win.callbacks = [listener];
                                // In IE 8 and less, only string argument can be safely passed to the function in other window
                                win.fire = function (string) {
                                    var i;

                                    for (i = 0; i < win.callbacks.length; i++) {
                                        win.callbacks[i](string);
                                    }
                                };
                            },
                            signal: function (type, data) {
                                if (!win.closed && win.fire) {
                                    win.fire(jQuery.stringifyJSON({
                                        target: "c",
                                        type: type,
                                        data: data
                                    }));
                                }
                            },
                            get: function (key) {
                                return !win.closed ? win[key] : null;
                            },
                            set: function (key, value) {
                                if (!win.closed) {
                                    win[key] = value;
                                }
                            },
                            close: function () {
                            }
                        };
                    }
                };

                // Receives send and close command from the children
                function listener(string) {
                    var command = jQuery.parseJSON(string), data = command.data;

                    if (command.target === "p") {
                        switch (command.type) {
                            case "send":
                                _push(data);
                                break;
                            case "localSend":
                                _localMessage(data);
                                break;
                            case "close":
                                _close();
                                break;
                        }
                    }
                }

                _localSocketF = function propagateMessageEvent(context) {
                    storageService.signal("message", context);
                };

                function leaveTrace() {
                    document.cookie = _sharingKey + "=" +
                        // Opera's JSON implementation ignores a number whose a last digit of 0 strangely
                        // but has no problem with a number whose a last digit of 9 + 1
                        encodeURIComponent(jQuery.stringifyJSON({
                            ts: jQuery.now() + 1,
                            heir: (storageService.get("children") || [])[0]
                        })) + "; path=/";
                }

                // Chooses a storageService
                storageService = servers.storage() || servers.windowref();
                storageService.init();

                if (_request.logLevel === 'debug') {
                    jQuery.atmosphere.debug("Installed StorageService " + storageService);
                }

                // List of children sockets
                storageService.set("children", []);

                if (storageService.get("opened") != null && !storageService.get("opened")) {
                    // Flag indicating the parent socket is opened
                    storageService.set("opened", false);
                }
                // Leaves traces
                _sharingKey = encodeURIComponent(name);
                leaveTrace();
                _traceTimer = setInterval(leaveTrace, 1000);

                _storageService = storageService;
            }

            /**
             * @private
             */
            function _open(state, transport, request) {
                if (_request.shared && transport !== 'local') {
                    share();
                }

                if (_storageService != null) {
                    _storageService.set("opened", true);
                }

                request.close = function () {
                    _close();
                };

                if (_requestCount > 0 && state === 're-connecting') {
                    request.isReopen = true;
                    _tryingToReconnect(_response);
                } else if (_response.error == null) {
                    _response.request = request;
                    var prevState = _response.state;
                    _response.state = state;
                    var prevTransport = _response.transport;
                    _response.transport = transport;

                    var _body = _response.responseBody;
                    _invokeCallback();
                    _response.responseBody = _body;

                    _response.state = prevState;
                    _response.transport = prevTransport;
                }
            }

            /**
             * Execute request using jsonp transport.
             *
             * @param request {Object} request Request parameters, if undefined _request object will be used.
             * @private
             */
            function _jsonp(request) {
                // When CORS is enabled, make sure we force the proper transport.
                request.transport = "jsonp";

                var rq = _request;
                if ((request != null) && (typeof (request) !== 'undefined')) {
                    rq = request;
                }

                var url = rq.url;
                if (rq.dispatchUrl != null) {
                    url += rq.dispatchUrl;
                }

                var data = rq.data;
                if (rq.attachHeadersAsQueryString) {
                    url = _attachHeaders(rq);
                    if (data !== '') {
                        url += "&X-Atmosphere-Post-Body=" + encodeURIComponent(data);
                    }
                    data = '';
                }

                _jqxhr = jQuery.ajax({
                    url: url,
                    type: rq.method,
                    dataType: "jsonp",
                    error: function (jqXHR, textStatus, errorThrown) {
                        _response.error = true;

                        if (rq.openId) {
                            clearTimeout(rq.openId);
                        }

                        if (rq.reconnect && _requestCount++ < rq.maxReconnectOnClose) {
                            _open('re-connecting', rq.transport, rq);
                            _reconnect(_jqxhr, rq, rq.reconnectInterval);
                            rq.openId = setTimeout(function() {
                                _triggerOpen(rq);
                            }, rq.reconnectInterval + 1000);
                        } else {
                            _onError(jqXHR.status, errorThrown);
                        }
                    },
                    jsonp: "jsonpTransport",
                    success: function (json) {
                        if (rq.reconnect) {
                            if (rq.maxRequest === -1 || rq.requestCount++ < rq.maxRequest) {
                                _readHeaders(_jqxhr, rq);

                                if (!rq.executeCallbackBeforeReconnect) {
                                    _reconnect(_jqxhr, rq, 0);
                                }

                                var msg = json.message;
                                if (msg != null && typeof msg !== 'string') {
                                    try {
                                        msg = jQuery.stringifyJSON(msg);
                                    } catch (err) {
                                        // The message was partial
                                    }
                                }

                                var skipCallbackInvocation = _trackMessageSize(msg, rq, _response);
                                if (!skipCallbackInvocation) {
                                    _prepareCallback(_response.responseBody, "messageReceived", 200, rq.transport);
                                }

                                if (rq.executeCallbackBeforeReconnect) {
                                    _reconnect(_jqxhr, rq, 0);
                                }
                            } else {
                                jQuery.atmosphere.log(_request.logLevel, ["JSONP reconnect maximum try reached " + _request.requestCount]);
                                _onError(0, "maxRequest reached");
                            }
                        }
                    },
                    data: rq.data,
                    beforeSend: function (jqXHR) {
                        _doRequest(jqXHR, rq, false);
                    }
                });
            }

            /**
             * Execute request using ajax transport.
             *
             * @param request {Object} request Request parameters, if undefined _request object will be used.
             * @private
             */
            function _ajax(request) {
                var rq = _request;
                if ((request != null) && (typeof (request) !== 'undefined')) {
                    rq = request;
                }

                var url = rq.url;
                if (rq.dispatchUrl != null) {
                    url += rq.dispatchUrl;
                }

                var data = rq.data;
                if (rq.attachHeadersAsQueryString) {
                    url = _attachHeaders(rq);
                    if (data !== '') {
                        url += "&X-Atmosphere-Post-Body=" + encodeURIComponent(data);
                    }
                    data = '';
                }

                var async = typeof (rq.async) !== 'undefined' ? rq.async : true;
                _jqxhr = jQuery.ajax({
                    url: url,
                    type: rq.method,
                    error: function (jqXHR, textStatus, errorThrown) {
                        _response.error = true;
                        if (jqXHR.status < 300) {
                            _reconnect(_jqxhr, rq);
                        } else {
                            _onError(jqXHR.status, errorThrown);
                        }
                    },
                    success: function (data, textStatus, jqXHR) {

                        if (rq.reconnect) {
                            if (rq.maxRequest === -1 || rq.requestCount++ < rq.maxRequest) {
                                if (!rq.executeCallbackBeforeReconnect) {
                                    _reconnect(_jqxhr, rq, 0);
                                }
                                var skipCallbackInvocation = _trackMessageSize(data, rq, _response);
                                if (!skipCallbackInvocation) {
                                    _prepareCallback(_response.responseBody, "messageReceived", 200, rq.transport);
                                }

                                if (rq.executeCallbackBeforeReconnect) {
                                    _reconnect(_jqxhr, rq, 0);
                                }
                            } else {
                                jQuery.atmosphere.log(_request.logLevel, ["AJAX reconnect maximum try reached " + _request.requestCount]);
                                _onError(0, "maxRequest reached");
                            }
                        }
                    },
                    beforeSend: function (jqXHR) {
                        _doRequest(jqXHR, rq, false);
                    },
                    crossDomain: rq.enableXDR,
                    async: async
                });
            }

            /**
             * Build websocket object.
             *
             * @param location {string} Web socket url.
             * @returns {websocket} Web socket object.
             * @private
             */
            function _getWebSocket(location) {
                if (_request.webSocketImpl != null) {
                    return _request.webSocketImpl;
                } else {
                    if (window.WebSocket) {
                        return new WebSocket(location);
                    } else {
                        return new MozWebSocket(location);
                    }
                }
            }

            /**
             * Build web socket url from request url.
             *
             * @return {string} Web socket url (start with "ws" or "wss" for secure web socket).
             * @private
             */
            function _buildWebSocketUrl() {
                var url = _attachHeaders(_request);

                return decodeURI(jQuery('<a href="' + url + '"/>')[0].href.replace(/^http/, "ws"));
            }

            /**
             * Build SSE url from request url.
             *
             * @return a url with Atmosphere's headers
             * @private
             */
            function _buildSSEUrl() {
                var url = _attachHeaders(_request);
                return url;
            }

            /**
             * Open SSE. <br>
             * Automatically use fallback transport if SSE can't be opened.
             *
             * @private
             */
            function _executeSSE(sseOpened) {

                _response.transport = "sse";

                var location = _buildSSEUrl(_request.url);

                if (_request.logLevel === 'debug') {
                    jQuery.atmosphere.debug("Invoking executeSSE");
                    jQuery.atmosphere.debug("Using URL: " + location);
                }

                if (_request.enableProtocol && sseOpened) {
                    var time = jQuery.now() - _request.ctime;
                    _request.lastTimestamp = Number(_request.stime) + Number(time);
                }

                if (sseOpened && !_request.reconnect) {
                    if (_sse != null) {
                        _clearState();
                    }
                    return;
                }

                try {
                    _sse = new EventSource(location, {
                        withCredentials: _request.withCredentials
                    });
                } catch (e) {
                    _onError(0, e);
                    _reconnectWithFallbackTransport("SSE failed. Downgrading to fallback transport and resending");
                    return;
                }

                if (_request.connectTimeout > 0) {
                    _request.id = setTimeout(function () {
                        if (!sseOpened) {
                            _clearState();
                        }
                    }, _request.connectTimeout);
                }

                _sse.onopen = function (event) {
                    _timeout(_request);
                    if (_request.logLevel === 'debug') {
                        jQuery.atmosphere.debug("SSE successfully opened");
                    }

                    if (!_request.enableProtocol) {
                        if (!sseOpened) {
                            _open('opening', "sse", _request);
                        } else {
                            _open('re-opening', "sse", _request);
                        }
                    } else if (_request.isReopen) {
                        _request.isReopen = false;
                        _open('re-opening', _request.transport, _request);
                    }
                    sseOpened = true;

                    if (_request.method === 'POST') {
                        _response.state = "messageReceived";
                        _sse.send(_request.data);
                    }
                };

                _sse.onmessage = function (message) {
                    _timeout(_request);
                    if (!_request.enableXDR && message.origin !== window.location.protocol + "//" + window.location.host) {
                        jQuery.atmosphere.log(_request.logLevel, ["Origin was not " + window.location.protocol + "//" + window.location.host]);
                        return;
                    }

                    _response.state = 'messageReceived';
                    _response.status = 200;

                    message = message.data;
                    var skipCallbackInvocation = _trackMessageSize(message, _request, _response);
                    if (!skipCallbackInvocation) {
                        _invokeCallback();
                        _response.responseBody = '';
                        _response.messages = [];
                    }
                };

                _sse.onerror = function (message) {
                    clearTimeout(_request.id);

                    if (_response.closedByClientTimeout) return;

                    _invokeClose(sseOpened);
                    _clearState();

                    if (_abordingConnection) {
                        jQuery.atmosphere.log(_request.logLevel, ["SSE closed normally"]);
                    } else if (!sseOpened) {
                        _reconnectWithFallbackTransport("SSE failed. Downgrading to fallback transport and resending");
                    } else if (_request.reconnect && (_response.transport === 'sse')) {
                        if (_requestCount++ < _request.maxReconnectOnClose) {
                            _open('re-connecting', _request.transport, _request);
                            if (_request.reconnectInterval > 0) {
                                _request.reconnectId = setTimeout(function () {
                                    _executeSSE(true);
                                }, _request.reconnectInterval);
                            } else {
                                _executeSSE(true);
                            }
                            _response.responseBody = "";
                            _response.messages = [];
                        } else {
                            jQuery.atmosphere.log(_request.logLevel, ["SSE reconnect maximum try reached " + _requestCount]);
                            _onError(0, "maxReconnectOnClose reached");
                        }
                    }
                };
            }

            /**
             * Open web socket. <br>
             * Automatically use fallback transport if web socket can't be opened.
             *
             * @private
             */
            function _executeWebSocket(webSocketOpened) {

                _response.transport = "websocket";

                if (_request.enableProtocol && webSocketOpened) {
                    var time = jQuery.now() - _request.ctime;
                    _request.lastTimestamp = Number(_request.stime) + Number(time);
                }

                var location = _buildWebSocketUrl(_request.url);
                if (_request.logLevel === 'debug') {
                    jQuery.atmosphere.debug("Invoking executeWebSocket");
                    jQuery.atmosphere.debug("Using URL: " + location);
                }

                if (webSocketOpened && !_request.reconnect) {
                    if (_websocket != null) {
                        _clearState();
                    }
                    return;
                }

                _websocket = _getWebSocket(location);
                if (_request.webSocketBinaryType != null) {
                    _websocket.binaryType = _request.webSocketBinaryType;
                }

                if (_request.connectTimeout > 0) {
                    _request.id = setTimeout(function () {
                        if (!webSocketOpened) {
                            var _message = {
                                code: 1002,
                                reason: "",
                                wasClean: false
                            };
                            _websocket.onclose(_message);
                            // Close it anyway
                            try {
                                _clearState();
                            } catch (e) {
                            }
                            return;
                        }

                    }, _request.connectTimeout);
                }

                _websocket.onopen = function (message) {
                    _timeout(_request);
                    if (_request.logLevel === 'debug') {
                        jQuery.atmosphere.debug("Websocket successfully opened");
                    }

                    var reopening = webSocketOpened;

                    webSocketOpened = true;
                    if(_websocket != null) {
                        _websocket.webSocketOpened = webSocketOpened;
                    }

                    if (!_request.enableProtocol) {
                        if (reopening) {
                            _open('re-opening', "websocket", _request);
                        } else {
                            _open('opening', "websocket", _request);
                        }
                    }

                    if (_websocket != null) {
                        if (_request.method === 'POST') {
                            _response.state = "messageReceived";
                            _websocket.send(_request.data);
                        }
                    }
                };

                _websocket.onmessage = function (message) {
                    _timeout(_request);

                    _response.state = 'messageReceived';
                    _response.status = 200;

                    message = message.data;
                    var isString = typeof (message) === 'string';
                    if (isString) {
                        var skipCallbackInvocation = _trackMessageSize(message, _request, _response);
                        if (!skipCallbackInvocation) {
                            _invokeCallback();
                            _response.responseBody = '';
                            _response.messages = [];
                        }
                    } else {
                        if (!_handleProtocol(_request, message))
                            return;

                        _response.responseBody = message;
                        _invokeCallback();
                        _response.responseBody = null;
                    }
                };

                _websocket.onerror = function (message) {
                    clearTimeout(_request.id);
                };

                _websocket.onclose = function (message) {
                    if (_response.state === 'closed')
                        return;
                    clearTimeout(_request.id);

                    var reason = message.reason;
                    if (reason === "") {
                        switch (message.code) {
                            case 1000:
                                reason = "Normal closure; the connection successfully completed whatever purpose for which " + "it was created.";
                                break;
                            case 1001:
                                reason = "The endpoint is going away, either because of a server failure or because the "
                                    + "browser is navigating away from the page that opened the connection.";
                                break;
                            case 1002:
                                reason = "The endpoint is terminating the connection due to a protocol error.";
                                break;
                            case 1003:
                                reason = "The connection is being terminated because the endpoint received data of a type it "
                                    + "cannot accept (for example, a text-only endpoint received binary data).";
                                break;
                            case 1004:
                                reason = "The endpoint is terminating the connection because a data frame was received that " + "is too large.";
                                break;
                            case 1005:
                                reason = "Unknown: no status code was provided even though one was expected.";
                                break;
                            case 1006:
                                reason = "Connection was closed abnormally (that is, with no close frame being sent).";
                                break;
                        }
                    }

                    if (_request.logLevel === 'warn') {
                        jQuery.atmosphere.warn("Websocket closed, reason: " + reason);
                        jQuery.atmosphere.warn("Websocket closed, wasClean: " + message.wasClean);
                    }

                    if (_response.closedByClientTimeout) {
                        return;
                    }

                    _invokeClose(webSocketOpened);

                    _response.state = 'closed';

                    if (_abordingConnection) {
                        jQuery.atmosphere.log(_request.logLevel, ["Websocket closed normally"]);
                    } else if (!webSocketOpened) {
                        _reconnectWithFallbackTransport("Websocket failed. Downgrading to Comet and resending");

                    } else if (_request.reconnect && _response.transport === 'websocket') {
                        _clearState();
                        if (_requestCount++ < _request.maxReconnectOnClose) {
                            _open('re-connecting', _request.transport, _request);
                            if (_request.reconnectInterval > 0) {
                                _request.reconnectId = setTimeout(function () {
                                    _response.responseBody = "";
                                    _response.messages = [];
                                    _executeWebSocket(true);
                                }, _request.reconnectInterval);
                            } else {
                                _response.responseBody = "";
                                _response.messages = [];
                                _executeWebSocket(true);
                            }
                        } else {
                            jQuery.atmosphere.log(_request.logLevel, ["Websocket reconnect maximum try reached " + _request.requestCount]);
                            if (_request.logLevel === 'warn') {
                                jQuery.atmosphere.warn("Websocket error, reason: " + message.reason);
                            }
                            _onError(0, "maxReconnectOnClose reached");
                        }
                    }
                };

                if (_websocket.url === undefined) {
                    // Android 4.1 does not really support websockets and fails silently
                    _websocket.onclose({
                        reason: "Android 4.1 does not support websockets.",
                        wasClean: false
                    });
                }
            }

            function _handleProtocol(request, message) {
                // The first messages is always the uuid.
                var b = true;

                if (request.transport === 'polling') return b;

                if (jQuery.trim(message).length !== 0 && request.enableProtocol && request.firstMessage) {
                    request.firstMessage = false;
                    var messages = message.split(request.messageDelimiter);
                    var pos = messages.length === 2 ? 0 : 1;
                    request.uuid = jQuery.trim(messages[pos]);
                    request.stime = jQuery.trim(messages[pos + 1]);
                    b = false;
                    if (request.transport !== 'long-polling') {
                        _triggerOpen(request);
                    }

                    jQuery.atmosphere.uuid = request.uuid;
                } else if (request.enableProtocol && request.firstMessage) {
                    // In case we are getting some junk from IE
                    b = false;
                } else {
                    _triggerOpen(request);
                }
                return b;
            }

            function _timeout(_request) {
                clearTimeout(_request.id);
                if (_request.timeout > 0 && _request.transport !== 'polling') {
                    _request.id = setTimeout(function () {
                        _onClientTimeout(_request);
                        _disconnect();
                        _clearState();
                    }, _request.timeout);
                }
            }

            function _onClientTimeout(_request) {
                _response.closedByClientTimeout = true;
                _response.state = 'closedByClient';
                _response.responseBody = "";
                _response.status = 408;
                _response.messages = [];
                _invokeCallback();
            }

            function _onError(code, reason) {
                _clearState();
                clearTimeout(_request.id);
                _response.state = 'error';
                _response.reasonPhrase = reason;
                _response.responseBody = "";
                _response.status = code;
                _response.messages = [];
                _invokeCallback();
            }

            /**
             * Track received message and make sure callbacks/functions are only invoked when the complete message has been received.
             *
             * @param message
             * @param request
             * @param response
             */
            function _trackMessageSize(message, request, response) {
                if (!_handleProtocol(request, message))
                    return true;
                if (message.length === 0)
                    return true;

                if (request.trackMessageLength) {
                    // prepend partialMessage if any
                    message = response.partialMessage + message;

                    var messages = [];
                    var messageStart = message.indexOf(request.messageDelimiter);
                    while (messageStart !== -1) {
                        var str = jQuery.trim(message.substring(0, messageStart));
                        var messageLength = parseInt(str, 10);
                        if (isNaN(messageLength))
                            throw 'message length "' + str + '" is not a number';
                        messageStart += request.messageDelimiter.length;
                        if (messageStart + messageLength > message.length) {
                            // message not complete, so there is no trailing messageDelimiter
                            messageStart = -1;
                        } else {
                            // message complete, so add it
                            messages.push(message.substring(messageStart, messageStart + messageLength));
                            // remove consumed characters
                            message = message.substring(messageStart + messageLength, message.length);
                            messageStart = message.indexOf(request.messageDelimiter);
                        }
                    }

                    /* keep any remaining data */
                    response.partialMessage = message;

                    if (messages.length !== 0) {
                        response.responseBody = messages.join(request.messageDelimiter);
                        response.messages = messages;
                        return false;
                    } else {
                        response.responseBody = "";
                        response.messages = [];
                        return true;
                    }
                } else {
                    response.responseBody = message;
                }
                return false;
            }

            /**
             * Reconnect request with fallback transport. <br>
             * Used in case websocket can't be opened.
             *
             * @private
             */
            function _reconnectWithFallbackTransport(errorMessage) {
                jQuery.atmosphere.log(_request.logLevel, [errorMessage]);

                if (typeof (_request.onTransportFailure) !== 'undefined') {
                    _request.onTransportFailure(errorMessage, _request);
                } else if (typeof (jQuery.atmosphere.onTransportFailure) !== 'undefined') {
                    jQuery.atmosphere.onTransportFailure(errorMessage, _request);
                }

                _request.transport = _request.fallbackTransport;
                var reconnectInterval = _request.connectTimeout === -1 ? 0 : _request.connectTimeout;
                if (_request.reconnect && _request.transport !== 'none' || _request.transport == null) {
                    _request.method = _request.fallbackMethod;
                    _response.transport = _request.fallbackTransport;
                    _request.fallbackTransport = 'none';
                    if (reconnectInterval > 0) {
                        _request.reconnectId = setTimeout(function () {
                            _execute();
                        }, reconnectInterval);
                    } else {
                        _execute();
                    }
                } else {
                    _onError(500, "Unable to reconnect with fallback transport");
                }
            }

            /**
             * Get url from request and attach headers to it.
             *
             * @param request {Object} request Request parameters, if undefined _request object will be used.
             *
             * @returns {Object} Request object, if undefined, _request object will be used.
             * @private
             */
            function _attachHeaders(request, url) {
                var rq = _request;
                if ((request != null) && (typeof (request) !== 'undefined')) {
                    rq = request;
                }

                if (url == null) {
                    url = rq.url;
                }

                // If not enabled
                if (!rq.attachHeadersAsQueryString)
                    return url;

                // If already added
                if (url.indexOf("X-Atmosphere-Framework") !== -1) {
                    return url;
                }

                url += (url.indexOf('?') !== -1) ? '&' : '?';
                url += "X-Atmosphere-tracking-id=" + rq.uuid;
                url += "&X-Atmosphere-Framework=" + jQuery.atmosphere.version;
                url += "&X-Atmosphere-Transport=" + rq.transport;

                if (rq.trackMessageLength) {
                    url += "&X-Atmosphere-TrackMessageSize=" + "true";
                }

                if (rq.lastTimestamp != null) {
                    url += "&X-Cache-Date=" + rq.lastTimestamp;
                } else {
                    url += "&X-Cache-Date=" + 0;
                }

                if (rq.contentType !== '') {
                    url += "&Content-Type=" + encodeURIComponent(rq.contentType);
                }

                if (rq.enableProtocol) {
                    url += "&X-atmo-protocol=true";
                }

                jQuery.each(rq.headers, function (name, value) {
                    var h = jQuery.isFunction(value) ? value.call(this, rq, request, _response) : value;
                    if (h != null) {
                        url += "&" + encodeURIComponent(name) + "=" + encodeURIComponent(h);
                    }
                });

                return url;
            }

            function _triggerOpen(rq) {
                if (!rq.isOpen) {
                    rq.isOpen = true;
                    _open('opening', rq.transport, rq);
                } else if (rq.isReopen) {
                    rq.isReopen = false;
                    _open('re-opening', rq.transport, rq);
                }
            }

            /**
             * Execute ajax request. <br>
             *
             * @param request {Object} request Request parameters, if undefined _request object will be used.
             * @private
             */
            function _executeRequest(request) {
                var rq = _request;
                if ((request != null) || (typeof (request) !== 'undefined')) {
                    rq = request;
                }

                rq.lastIndex = 0;
                rq.readyState = 0;

                // CORS fake using JSONP
                if ((rq.transport === 'jsonp') || ((rq.enableXDR) && (jQuery.atmosphere.checkCORSSupport()))) {
                    _jsonp(rq);
                    return;
                }

                if (rq.transport === 'ajax') {
                    _ajax(request);
                    return;
                }

                if (jQuery.browser.msie && +jQuery.browser.version.split(".")[0] < 10) {
                    if ((rq.transport === 'streaming')) {
                        if (rq.enableXDR && window.XDomainRequest) {
                            _ieXDR(rq);
                        } else {
                            _ieStreaming(rq);
                        }
                        return;
                    }

                    if ((rq.enableXDR) && (window.XDomainRequest)) {
                        _ieXDR(rq);
                        return;
                    }
                }

                var reconnectF = function () {
                    rq.lastIndex = 0;
                    if (rq.reconnect && _requestCount++ < rq.maxReconnectOnClose) {
                        _open('re-connecting', request.transport, request);
                        _reconnect(ajaxRequest, rq, request.reconnectInterval);
                    } else {
                        _onError(0, "maxReconnectOnClose reached");
                    }
                };

                if (rq.reconnect && (rq.maxRequest === -1 || rq.requestCount++ < rq.maxRequest)) {
                    var ajaxRequest = jQuery.ajaxSettings.xhr();
                    ajaxRequest.hasData = false;

                    _doRequest(ajaxRequest, rq, true);

                    if (rq.suspend) {
                        _activeRequest = ajaxRequest;
                    }

                    if (rq.transport !== 'polling') {
                        _response.transport = rq.transport;

                        ajaxRequest.onabort = function () {
                            _invokeClose(true);
                        };

                        ajaxRequest.onerror = function () {
                            _response.error = true;
                            try {
                                _response.status = XMLHttpRequest.status;
                            } catch (e) {
                                _response.status = 500;
                            }

                            if (!_response.status) {
                                _response.status = 500;
                            }
                            if (!_response.errorHandled) {
                                _clearState();
                                reconnectF();
                            }
                        };
                    }

                    ajaxRequest.onreadystatechange = function () {
                        if (_abordingConnection) {
                            return;
                        }

                        _response.error = null;
                        var skipCallbackInvocation = false;
                        var update = false;

                        if (rq.transport === 'streaming' && rq.readyState > 2 && ajaxRequest.readyState === 4) {
                            _clearState();
                            reconnectF();
                            return;
                        }

                        rq.readyState = ajaxRequest.readyState;

                        if (rq.transport === 'streaming' && ajaxRequest.readyState >= 3) {
                            update = true;
                        } else if (rq.transport === 'long-polling' && ajaxRequest.readyState === 4) {
                            update = true;
                        }
                        _timeout(_request);

                        if (rq.transport !== 'polling') {
                            // MSIE 9 and lower status can be higher than 1000, Chrome can be 0
                            var status = 200;
                            if (ajaxRequest.readyState === 4) {
                                status = ajaxRequest.status > 1000 ? 0 : ajaxRequest.status;
                            }

                            if (status >= 300 || status === 0) {
                                // Prevent onerror callback to be called
                                _response.errorHandled = true;
                                _clearState();
                                reconnectF();
                                return;
                            }
                            
                            // Firefox incorrectly send statechange 0->2 when a reconnect attempt fails. The above checks ensure that onopen is not called for these
                            if ((!rq.enableProtocol || !request.firstMessage) && ajaxRequest.readyState === 2) {
                                _triggerOpen(rq);
                            }
                        } else if (ajaxRequest.readyState === 4) {
                            update = true;
                        }

                        if (update) {
                            var responseText = ajaxRequest.responseText;

                            if (jQuery.trim(responseText).length === 0 && rq.transport === 'long-polling') {
                                // For browser that aren't support onabort
                                if (!ajaxRequest.hasData) {
                                    _reconnect(ajaxRequest, rq, 0);
                                } else {
                                    ajaxRequest.hasData = false;
                                }
                                return;
                            }
                            ajaxRequest.hasData = true;

                            _readHeaders(ajaxRequest, _request);

                            if (rq.transport === 'streaming') {
                                if (!jQuery.browser.opera) {
                                    var message = responseText.substring(rq.lastIndex, responseText.length);
                                    skipCallbackInvocation = _trackMessageSize(message, rq, _response);

                                    rq.lastIndex = responseText.length;
                                    if (skipCallbackInvocation) {
                                        return;
                                    }
                                } else {
                                    jQuery.atmosphere.iterate(function () {
                                        if (_response.status !== 500 && ajaxRequest.responseText.length > rq.lastIndex) {
                                            try {
                                                _response.status = ajaxRequest.status;
                                                _response.headers = parseHeaders(ajaxRequest.getAllResponseHeaders());

                                                _readHeaders(ajaxRequest, _request);

                                            } catch (e) {
                                                _response.status = 404;
                                            }
                                            _timeout(_request);

                                            _response.state = "messageReceived";
                                            var message = ajaxRequest.responseText.substring(rq.lastIndex);
                                            rq.lastIndex = ajaxRequest.responseText.length;

                                            skipCallbackInvocation = _trackMessageSize(message, rq, _response);
                                            if (!skipCallbackInvocation) {
                                                _invokeCallback();
                                            }

                                            _verifyStreamingLength(ajaxRequest, rq);
                                        } else if (_response.status > 400) {
                                            // Prevent replaying the last message.
                                            rq.lastIndex = ajaxRequest.responseText.length;
                                            return false;
                                        }
                                    }, 0);
                                }
                            } else {
                                skipCallbackInvocation = _trackMessageSize(responseText, rq, _response);
                            }

                            try {
                                _response.status = ajaxRequest.status;
                                _response.headers = parseHeaders(ajaxRequest.getAllResponseHeaders());

                                _readHeaders(ajaxRequest, rq);
                            } catch (e) {
                                _response.status = 404;
                            }

                            if (rq.suspend) {
                                _response.state = _response.status === 0 ? "closed" : "messageReceived";
                            } else {
                                _response.state = "messagePublished";
                            }

                            var isAllowedToReconnect = request.transport !== 'streaming' && request.transport !== 'polling';;
                            if (isAllowedToReconnect && !rq.executeCallbackBeforeReconnect) {
                                _reconnect(ajaxRequest, rq, 0);
                            }

                            if (_response.responseBody.length !== 0 && !skipCallbackInvocation)
                                _invokeCallback();

                            if (isAllowedToReconnect && rq.executeCallbackBeforeReconnect) {
                                _reconnect(ajaxRequest, rq, 0);
                            }

                            _verifyStreamingLength(ajaxRequest, rq);
                        }
                    };

                    ajaxRequest.send(rq.data);
                    _subscribed = true;
                } else {
                    if (rq.logLevel === 'debug') {
                        jQuery.atmosphere.log(rq.logLevel, ["Max re-connection reached."]);
                    }
                    _onError(0, "maxRequest reached");
                }
            }

            /**
             * Do ajax request.
             *
             * @param ajaxRequest Ajax request.
             * @param request Request parameters.
             * @param create If ajax request has to be open.
             */
            function _doRequest(ajaxRequest, request, create) {
                // Prevent Android to cache request
                var url = request.url;
                if (request.dispatchUrl != null && request.method === 'POST') {
                    url += request.dispatchUrl;
                }
                url = _attachHeaders(request, url);
                url = jQuery.atmosphere.prepareURL(url);

                if (create) {
                    ajaxRequest.open(request.method, url, true);
                    if (request.connectTimeout > 0) {
                        request.id = setTimeout(function () {
                            if (request.requestCount === 0) {
                                _clearState();
                                _prepareCallback("Connect timeout", "closed", 200, request.transport);
                            }
                        }, request.connectTimeout);
                    }
                }

                if (_request.withCredentials) {
                    if ("withCredentials" in ajaxRequest) {
                        ajaxRequest.withCredentials = true;
                    }
                }

                if (!_request.dropHeaders) {
                    ajaxRequest.setRequestHeader("X-Atmosphere-Framework", jQuery.atmosphere.version);
                    ajaxRequest.setRequestHeader("X-Atmosphere-Transport", request.transport);
                    if (request.lastTimestamp != null) {
                        ajaxRequest.setRequestHeader("X-Cache-Date", request.lastTimestamp);
                    } else {
                        ajaxRequest.setRequestHeader("X-Cache-Date", 0);
                    }

                    if (request.trackMessageLength) {
                        ajaxRequest.setRequestHeader("X-Atmosphere-TrackMessageSize", "true");
                    }
                    ajaxRequest.setRequestHeader("X-Atmosphere-tracking-id", request.uuid);

                    jQuery.each(request.headers, function (name, value) {
                        var h = jQuery.isFunction(value) ? value.call(this, ajaxRequest, request, create, _response) : value;
                        if (h != null) {
                            ajaxRequest.setRequestHeader(name, h);
                        }
                    });
                }

                if (request.contentType !== '') {
                    ajaxRequest.setRequestHeader("Content-Type", request.contentType);
                }
            }

            function _reconnect(ajaxRequest, request, reconnectInterval) {
                if (request.reconnect || (request.suspend && _subscribed)) {
                    var status = 0;
                    if (ajaxRequest.readyState !== 0) {
                        status = ajaxRequest.status > 1000 ? 0 : ajaxRequest.status;
                    }
                    _response.status = status === 0 ? 204 : status;
                    _response.reason = status === 0 ? "Server resumed the connection or down." : "OK";

                    // Reconnect immediately
                    clearTimeout(request.id);
                    if (request.reconnectId) {
                        clearTimeout(request.reconnectId);
                        delete request.reconnectId;
                    }

                    if (reconnectInterval > 0) {
                        setTimeout(function () {
                            _request.reconnectId = _executeRequest(request);
                        }, reconnectInterval);
                    } else {
                        _executeRequest(request);
                    }
                }
            }

            function _tryingToReconnect(response) {
                response.state = 're-connecting';
                _invokeFunction(response);
            }

            // From jquery-stream, which is APL2 licensed as well.
            function _ieXDR(request) {
                if (request.transport !== "polling") {
                    _ieStream = _configureXDR(request);
                    _ieStream.open();
                } else {
                    _configureXDR(request).open();
                }
            }

            function _configureXDR(request) {
                var rq = _request;
                if ((request != null) && (typeof (request) !== 'undefined')) {
                    rq = request;
                }

                var transport = rq.transport;
                var lastIndex = 0;
                var xdr = new window.XDomainRequest();

                var reconnect = function () {
                    if (rq.transport === "long-polling" && (rq.reconnect && (rq.maxRequest === -1 || rq.requestCount++ < rq.maxRequest))) {
                        xdr.status = 200;
                        _ieXDR(rq);
                    }
                };

                var rewriteURL = rq.rewriteURL || function (url) {
                    // Maintaining session by rewriting URL
                    // http://stackoverflow.com/questions/6453779/maintaining-session-by-rewriting-url
                    var match = /(?:^|;\s*)(JSESSIONID|PHPSESSID)=([^;]*)/.exec(document.cookie);

                    switch (match && match[1]) {
                        case "JSESSIONID":
                            return url.replace(/;jsessionid=[^\?]*|(\?)|$/, ";jsessionid=" + match[2] + "$1");
                        case "PHPSESSID":
                            return url.replace(/\?PHPSESSID=[^&]*&?|\?|$/, "?PHPSESSID=" + match[2] + "&").replace(/&$/, "");
                    }
                    return url;
                };

                // Handles open and message event
                xdr.onprogress = function () {
                    handle(xdr);
                };
                // Handles error event
                xdr.onerror = function () {
                    // If the server doesn't send anything back to XDR will fail with polling
                    if (rq.transport !== 'polling') {
                        _clearState();
                        if (_requestCount++ < rq.maxReconnectOnClose) {
                            if (rq.reconnectInterval > 0) {
                                rq.reconnectId = setTimeout(function () {
                                    _open('re-connecting', request.transport, request);
                                    _ieXDR(rq);
                                }, rq.reconnectInterval);
                            } else {
                                _open('re-connecting', request.transport, request);
                                _ieXDR(rq);
                            }
                        } else {
                            _onError(0, "maxReconnectOnClose reached");
                        }
                    }
                };

                // Handles close event
                xdr.onload = function () {
                };

                var handle = function (xdr) {
                    clearTimeout(rq.id);
                    var message = xdr.responseText;

                    message = message.substring(lastIndex);
                    lastIndex += message.length;

                    if (transport !== 'polling') {
                        _timeout(rq);

                        var skipCallbackInvocation = _trackMessageSize(message, rq, _response);

                        if (transport === 'long-polling' && jQuery.trim(message).length === 0)
                            return;

                        if (rq.executeCallbackBeforeReconnect) {
                            reconnect();
                        }

                        if (!skipCallbackInvocation) {
                            _prepareCallback(_response.responseBody, "messageReceived", 200, transport);
                        }

                        if (!rq.executeCallbackBeforeReconnect) {
                            reconnect();
                        }
                    }
                };

                return {
                    open: function () {
                        var url = rq.url;
                        if (rq.dispatchUrl != null) {
                            url += rq.dispatchUrl;
                        }
                        url = _attachHeaders(rq, url);
                        xdr.open(rq.method, rewriteURL(url));
                        if (rq.method === 'GET') {
                            xdr.send();
                        } else {
                            xdr.send(rq.data);
                        }

                        if (rq.connectTimeout > 0) {
                            rq.id = setTimeout(function () {
                                if (rq.requestCount === 0) {
                                    _clearState();
                                    _prepareCallback("Connect timeout", "closed", 200, rq.transport);
                                }
                            }, rq.connectTimeout);
                        }
                    },
                    close: function () {
                        xdr.abort();
                    }
                };
            }

            function _ieStreaming(request) {
                _ieStream = _configureIE(request);
                _ieStream.open();
            }

            function _configureIE(request) {
                var rq = _request;
                if ((request != null) && (typeof (request) !== 'undefined')) {
                    rq = request;
                }

                var stop;
                var doc = new window.ActiveXObject("htmlfile");

                doc.open();
                doc.close();

                var url = rq.url;
                if (rq.dispatchUrl != null) {
                    url += rq.dispatchUrl;
                }

                if (rq.transport !== 'polling') {
                    _response.transport = rq.transport;
                }

                return {
                    open: function () {
                        var iframe = doc.createElement("iframe");

                        url = _attachHeaders(rq);
                        if (rq.data !== '') {
                            url += "&X-Atmosphere-Post-Body=" + encodeURIComponent(rq.data);
                        }

                        // Finally attach a timestamp to prevent Android and IE caching.
                        url = jQuery.atmosphere.prepareURL(url);

                        iframe.src = url;
                        doc.body.appendChild(iframe);

                        // For the server to respond in a consistent format regardless of user agent, we polls response text
                        var cdoc = iframe.contentDocument || iframe.contentWindow.document;

                        stop = jQuery.atmosphere.iterate(function () {
                            try {
                                if (!cdoc.firstChild) {
                                    return;
                                }

                                // Detects connection failure
                                if (cdoc.readyState === "complete") {
                                    try {
                                        jQuery.noop(cdoc.fileSize);
                                    } catch (e) {
                                        _prepareCallback("Connection Failure", "error", 500, rq.transport);
                                        return false;
                                    }
                                }

                                var res = cdoc.body ? cdoc.body.lastChild : cdoc;
                                var readResponse = function () {
                                    // Clones the element not to disturb the original one
                                    var clone = res.cloneNode(true);

                                    // If the last character is a carriage return or a line feed, IE ignores it in the innerText property
                                    // therefore, we add another non-newline character to preserve it
                                    clone.appendChild(cdoc.createTextNode("."));

                                    var text = clone.innerText;

                                    text = text.substring(0, text.length - 1);
                                    return text;

                                };

                                // To support text/html content type
                                if (!jQuery.nodeName(res, "pre")) {
                                    // Injects a plaintext element which renders text without interpreting the HTML and cannot be stopped
                                    // it is deprecated in HTML5, but still works
                                    var head = cdoc.head || cdoc.getElementsByTagName("head")[0] || cdoc.documentElement || cdoc;
                                    var script = cdoc.createElement("script");

                                    script.text = "document.write('<plaintext>')";

                                    head.insertBefore(script, head.firstChild);
                                    head.removeChild(script);

                                    // The plaintext element will be the response container
                                    res = cdoc.body.lastChild;
                                }

                                if (rq.closed) {
                                    rq.isReopen = true;
                                }

                                // Handles message and close event
                                stop = jQuery.atmosphere.iterate(function () {
                                    var text = readResponse();
                                    if (text.length > rq.lastIndex) {
                                        _timeout(_request);

                                        _response.status = 200;
                                        _response.error = null;

                                        // Empties response every time that it is handled
                                        res.innerText = "";
                                        var skipCallbackInvocation = _trackMessageSize(text, rq, _response);
                                        if (skipCallbackInvocation) {
                                            return "";
                                        }

                                        _prepareCallback(_response.responseBody, "messageReceived", 200, rq.transport);
                                    }

                                    rq.lastIndex = 0;

                                    if (cdoc.readyState === "complete") {
                                        _invokeClose(true);
                                        _open('re-connecting', rq.transport, rq);
                                        if (rq.reconnectInterval > 0) {
                                            rq.reconnectId = setTimeout(function () {
                                                _ieStreaming(rq);
                                            }, rq.reconnectInterval);
                                        } else {
                                            _ieStreaming(rq);
                                        }
                                        return false;
                                    }
                                }, null);

                                return false;
                            } catch (err) {
                                _response.error = true;
                                _open('re-connecting', rq.transport, rq);
                                if (_requestCount++ < rq.maxReconnectOnClose) {
                                    if (rq.reconnectInterval > 0) {
                                        rq.reconnectId = setTimeout(function () {
                                            _ieStreaming(rq);
                                        }, rq.reconnectInterval);
                                    } else {
                                        _ieStreaming(rq);
                                    }
                                } else {
                                    _onError(0, "maxReconnectOnClose reached");
                                }
                                doc.execCommand("Stop");
                                doc.close();
                                return false;
                            }
                        });
                    },

                    close: function () {
                        if (stop) {
                            stop();
                        }

                        doc.execCommand("Stop");
                        _invokeClose(true);
                    }
                };
            }

            /**
             * Send message. <br>
             * Will be automatically dispatch to other connected.
             *
             * @param {Object, string} Message to send.
             * @private
             */
            function _push(message) {

                if (_localStorageService != null) {
                    _pushLocal(message);
                } else if (_activeRequest != null || _sse != null) {
                    _pushAjaxMessage(message);
                } else if (_ieStream != null) {
                    _pushIE(message);
                } else if (_jqxhr != null) {
                    _pushJsonp(message);
                } else if (_websocket != null) {
                    _pushWebSocket(message);
                } else {
                    _onError(0, "No suspended connection available");
                    jQuery.atmosphere.error("No suspended connection available. Make sure atmosphere.subscribe has been called and request.onOpen invoked before invoking this method");
                }
            }

            function _pushOnClose(message) {
                var rq = _getPushRequest(message);
                rq.transport = "ajax";
                rq.method = "GET";
                rq.async = false;
                rq.reconnect = false;
                _executeRequest(rq);
            }

            function _pushLocal(message) {
                _localStorageService.send(message);
            }

            function _intraPush(message) {
                // IE 9 will crash if not.
                if (message.length === 0)
                    return;

                try {
                    if (_localStorageService) {
                        _localStorageService.localSend(message);
                    } else if (_storageService) {
                        _storageService.signal("localMessage", jQuery.stringifyJSON({
                            id: guid,
                            event: message
                        }));
                    }
                } catch (err) {
                    jQuery.atmosphere.error(err);
                }
            }

            /**
             * Send a message using currently opened ajax request (using http-streaming or long-polling). <br>
             *
             * @param {string, Object} Message to send. This is an object, string message is saved in data member.
             * @private
             */
            function _pushAjaxMessage(message) {
                var rq = _getPushRequest(message);
                _executeRequest(rq);
            }

            /**
             * Send a message using currently opened ie streaming (using http-streaming or long-polling). <br>
             *
             * @param {string, Object} Message to send. This is an object, string message is saved in data member.
             * @private
             */
            function _pushIE(message) {
                if (_request.enableXDR && jQuery.atmosphere.checkCORSSupport()) {
                    var rq = _getPushRequest(message);
                    // Do not reconnect since we are pushing.
                    rq.reconnect = false;
                    _jsonp(rq);
                } else {
                    _pushAjaxMessage(message);
                }
            }

            /**
             * Send a message using jsonp transport. <br>
             *
             * @param {string, Object} Message to send. This is an object, string message is saved in data member.
             * @private
             */
            function _pushJsonp(message) {
                _pushAjaxMessage(message);
            }

            function _getStringMessage(message) {
                var msg = message;
                if (typeof (msg) === 'object') {
                    msg = message.data;
                }
                return msg;
            }

            /**
             * Build request use to push message using method 'POST' <br>. Transport is defined as 'polling' and 'suspend' is set to false.
             *
             * @return {Object} Request object use to push message.
             * @private
             */
            function _getPushRequest(message) {
                var msg = _getStringMessage(message);

                var rq = {
                    connected: false,
                    timeout: 60000,
                    method: 'POST',
                    url: _request.url,
                    contentType: _request.contentType,
                    headers: _request.headers,
                    reconnect: true,
                    callback: null,
                    data: msg,
                    suspend: false,
                    maxRequest: -1,
                    logLevel: 'info',
                    requestCount: 0,
                    withCredentials: _request.withCredentials,
                    transport: 'polling',
                    isOpen: true,
                    attachHeadersAsQueryString: true,
                    enableXDR: _request.enableXDR,
                    uuid: _request.uuid,
                    dispatchUrl: _request.dispatchUrl,
                    enableProtocol: false,
                    messageDelimiter: '|',
                    maxReconnectOnClose: _request.maxReconnectOnClose
                };

                if (typeof (message) === 'object') {
                    rq = jQuery.extend(rq, message);
                }

                return rq;
            }

            /**
             * Send a message using currently opened websocket. <br>
             *
             */
            function _pushWebSocket(message) {
                var msg = jQuery.atmosphere.isBinary(message) ? message : _getStringMessage(message);
                var data;
                try {
                    if (_request.dispatchUrl != null) {
                        data = _request.webSocketPathDelimiter + _request.dispatchUrl + _request.webSocketPathDelimiter + msg;
                    } else {
                        data = msg;
                    }

                    if (!_websocket.webSocketOpened) {
                        jQuery.atmosphere.error("WebSocket not connected.");
                        return;
                    }

                    _websocket.send(data);

                } catch (e) {
                    _websocket.onclose = function (message) {
                    };
                    _clearState();

                    _reconnectWithFallbackTransport("Websocket failed. Downgrading to Comet and resending " + data);
                    _pushAjaxMessage(message);
                }
            }

            function _localMessage(message) {
                var m = jQuery.parseJSON(message);
                if (m.id !== guid) {
                    if (typeof (_request.onLocalMessage) !== 'undefined') {
                        _request.onLocalMessage(m.event);
                    } else if (typeof (jQuery.atmosphere.onLocalMessage) !== 'undefined') {
                        jQuery.atmosphere.onLocalMessage(m.event);
                    }
                }
            }

            function _prepareCallback(messageBody, state, errorCode, transport) {

                _response.responseBody = messageBody;
                _response.transport = transport;
                _response.status = errorCode;
                _response.state = state;

                _invokeCallback();
            }

            function _readHeaders(xdr, request) {
                if (!request.readResponsesHeaders) {
                    if (!request.enableProtocol) {
                        request.lastTimestamp = jQuery.now();
                        request.uuid = jQuery.atmosphere.guid();
                    }
                }
                else {
                    try {
                        var tempDate = xdr.getResponseHeader('X-Cache-Date');
                        if (tempDate && tempDate != null && tempDate.length > 0) {
                            request.lastTimestamp = tempDate.split(" ").pop();
                        }

                        var tempUUID = xdr.getResponseHeader('X-Atmosphere-tracking-id');
                        if (tempUUID && tempUUID != null) {
                            request.uuid = tempUUID.split(" ").pop();
                        }
                    } catch (e) {
                    }
                }
            }

            function _invokeFunction(response) {
                _f(response, _request);
                // Global
                _f(response, jQuery.atmosphere);
            }

            function _f(response, f) {
                switch (response.state) {
                    case "messageReceived":
                        _requestCount = 0;
                        if (typeof (f.onMessage) !== 'undefined')
                            f.onMessage(response);
                        break;
                    case "error":
                        if (typeof (f.onError) !== 'undefined')
                            f.onError(response);
                        break;
                    case "opening":
                        delete _request.closed;
                        if (typeof (f.onOpen) !== 'undefined')
                            f.onOpen(response);
                        break;
                    case "messagePublished":
                        if (typeof (f.onMessagePublished) !== 'undefined')
                            f.onMessagePublished(response);
                        break;
                    case "re-connecting":
                        if (typeof (f.onReconnect) !== 'undefined')
                            f.onReconnect(_request, response);
                        break;
                    case "closedByClient":
                        if (typeof (f.onClientTimeout) !== 'undefined')
                            f.onClientTimeout(_request);
                        break;
                    case "re-opening":
                        delete _request.closed;
                        if (typeof (f.onReopen) !== 'undefined')
                            f.onReopen(_request, response);
                        break;
                    case "fail-to-reconnect":
                        if (typeof (f.onFailureToReconnect) !== 'undefined')
                            f.onFailureToReconnect(_request, response);
                        break;
                    case "unsubscribe":
                    case "closed":
                        var closed = typeof (_request.closed) !== 'undefined' ? _request.closed : false;
                        if (typeof (f.onClose) !== 'undefined' && !closed)
                            f.onClose(response);
                        _request.closed = true;
                        break;
                }
            }

            function _invokeClose(wasOpen) {
                if (_response.state !== 'closed') {
                    _response.state = 'closed';
                    _response.responseBody = "";
                    _response.messages = [];
                    _response.status = !wasOpen ? 501 : 200;
                    _invokeCallback();
                }
            }

            /**
             * Invoke request callbacks.
             *
             * @private
             */
            function _invokeCallback() {
                var call = function (index, func) {
                    func(_response);
                };

                if (_localStorageService == null && _localSocketF != null) {
                    _localSocketF(_response.responseBody);
                }

                _request.reconnect = _request.mrequest;

                var isString = typeof (_response.responseBody) === 'string';
                var messages = (isString && _request.trackMessageLength) ? (_response.messages.length > 0 ? _response.messages : ['']) : new Array(
                    _response.responseBody);
                for (var i = 0; i < messages.length; i++) {

                    if (messages.length > 1 && messages[i].length === 0) {
                        continue;
                    }
                    _response.responseBody = (isString) ? jQuery.trim(messages[i]) : messages[i];

                    if (_localStorageService == null && _localSocketF != null) {
                        _localSocketF(_response.responseBody);
                    }

                    if (_response.responseBody.length === 0 && _response.state === "messageReceived") {
                        continue;
                    }

                    _invokeFunction(_response);

                    // Invoke global callbacks
                    if (jQuery.atmosphere.callbacks.length > 0) {
                        if (_request.logLevel === 'debug') {
                            jQuery.atmosphere.debug("Invoking " + jQuery.atmosphere.callbacks.length + " global callbacks: " + _response.state);
                        }
                        try {
                            jQuery.each(jQuery.atmosphere.callbacks, call);
                        } catch (e) {
                            jQuery.atmosphere.log(_request.logLevel, ["Callback exception" + e]);
                        }
                    }

                    // Invoke request callback
                    if (typeof (_request.callback) === 'function') {
                        if (_request.logLevel === 'debug') {
                            jQuery.atmosphere.debug("Invoking request callbacks");
                        }
                        try {
                            _request.callback(_response);
                        } catch (e) {
                            jQuery.atmosphere.log(_request.logLevel, ["Callback exception" + e]);
                        }
                    }
                }

            }

            /**
             *
             * @private
             */
            function _verifyStreamingLength(ajaxRequest, rq) {
                // Wait to be sure we have the full message before closing.
                if (_response.partialMessage === "" && (rq.transport === 'streaming') && (ajaxRequest.responseText.length > rq.maxStreamingLength)) {
                    _response.messages = [];
                    _invokeClose(true);
                    _disconnect();
                    _clearState();
                    _reconnect(ajaxRequest, rq, 0);
                }
            }

            /**
             * Disconnect
             *
             * @private
             */
            function _disconnect() {
                if (_request.enableProtocol && !_request.firstMessage) {
                    var query = "X-Atmosphere-Transport=close&X-Atmosphere-tracking-id=" + _request.uuid;

                    jQuery.each(_request.headers, function (name, value) {
                        var h = jQuery.isFunction(value) ? value.call(this, _request, _request, _response) : value;
                        if (h != null) {
                            query += "&" + encodeURIComponent(name) + "=" + encodeURIComponent(h);
                        }
                    });

                    var url = _request.url.replace(/([?&])_=[^&]*/, query);
                    url = url + (url === _request.url ? (/\?/.test(_request.url) ? "&" : "?") + query : "");

                    if (_request.connectTimeout > 0) {
                        jQuery.ajax({
                            url: url,
                            async: true,
                            timeout: _request.connectTimeout,
                            cache: false
                        });
                    } else {
                        jQuery.ajax({
                            url: url,
                            async: true,
                            cache: false
                        });
                    }
                }
            }

            /**
             * Close request.
             *
             * @private
             */
            function _close() {
                if (_request.reconnectId) {
                    clearTimeout(_request.reconnectId);
                    delete _request.reconnectId;
                }
                _request.reconnect = false;
                _abordingConnection = true;
                _response.request = _request;
                _response.state = 'unsubscribe';
                _response.responseBody = "";
                _response.status = 408;
                _invokeCallback();
                _disconnect();

                _clearState();
            }

            function _clearState() {
                if (_request.id) {
                    clearTimeout(_request.id);
                }

                if (_ieStream != null) {
                    _ieStream.close();
                    _ieStream = null;
                }
                if (_jqxhr != null) {
                    _jqxhr.abort();
                    _jqxhr = null;
                }
                if (_activeRequest != null) {
                    _activeRequest.abort();
                    _activeRequest = null;
                }
                if (_websocket != null) {
                    if (_websocket.webSocketOpened) {
                        _websocket.close();
                    }
                    _websocket = null;
                }
                if (_sse != null) {
                    _sse.close();
                    _sse = null;
                }

                _clearStorage();
            }

            function _clearStorage() {
                // Stop sharing a connection
                if (_storageService != null) {
                    // Clears trace timer
                    clearInterval(_traceTimer);
                    // Removes the trace
                    document.cookie = _sharingKey + "=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/";
                    // The heir is the parent unless unloading
                    _storageService.signal("close", {
                        reason: "",
                        heir: !_abordingConnection ? guid : (_storageService.get("children") || [])[0]
                    });
                    _storageService.close();
                }
                if (_localStorageService != null) {
                    _localStorageService.close();
                }
            }

            this.subscribe = function (options) {
                _subscribe(options);
                _execute();
            };

            this.execute = function () {
                _execute();
            };

            this.invokeCallback = function () {
                _invokeCallback();
            };

            this.close = function () {
                _close();
            };

            this.disconnect = function () {
                _disconnect();
            };

            this.getUrl = function () {
                return _request.url;
            };

            this.push = function (message, dispatchUrl) {
                if (dispatchUrl != null) {
                    var originalDispatchUrl = _request.dispatchUrl;
                    _request.dispatchUrl = dispatchUrl;
                    _push(message);
                    _request.dispatchUrl = originalDispatchUrl;
                } else {
                    _push(message);
                }
            };

            this.getUUID = function () {
                return _request.uuid;
            };

            this.pushLocal = function (message) {
                _intraPush(message);
            };

            this.enableProtocol = function (message) {
                return _request.enableProtocol;
            };

            this.request = _request;
            this.response = _response;
        },

        subscribe: function (url, callback, request) {
            if (typeof (callback) === 'function') {
                jQuery.atmosphere.addCallback(callback);
            }

            // https://github.com/Atmosphere/atmosphere-javascript/issues/58
            jQuery.atmosphere.uuid = 0;

            if (typeof (url) !== "string") {
                request = url;
            } else {
                request.url = url;
            }

            var rq = new jQuery.atmosphere.AtmosphereRequest(request);
            rq.execute();

            jQuery.atmosphere.requests[jQuery.atmosphere.requests.length] = rq;
            return rq;
        },

        addCallback: function (func) {
            if (jQuery.inArray(func, jQuery.atmosphere.callbacks) === -1) {
                jQuery.atmosphere.callbacks.push(func);
            }
        },

        removeCallback: function (func) {
            var index = jQuery.inArray(func, jQuery.atmosphere.callbacks);
            if (index !== -1) {
                jQuery.atmosphere.callbacks.splice(index, 1);
            }
        },

        unsubscribe: function () {
            if (jQuery.atmosphere.requests.length > 0) {
                var requestsClone = [].concat(jQuery.atmosphere.requests);
                for (var i = 0; i < requestsClone.length; i++) {
                    var rq = requestsClone[i];
                    rq.close();
                    clearTimeout(rq.response.request.id);
                }
            }
            jQuery.atmosphere.requests = [];
            jQuery.atmosphere.callbacks = [];
        },

        unsubscribeUrl: function (url) {
            var idx = -1;
            if (jQuery.atmosphere.requests.length > 0) {
                for (var i = 0; i < jQuery.atmosphere.requests.length; i++) {
                    var rq = jQuery.atmosphere.requests[i];

                    // Suppose you can subscribe once to an url
                    if (rq.getUrl() === url) {
                        rq.close();
                        clearTimeout(rq.response.request.id);
                        idx = i;
                        break;
                    }
                }
            }
            if (idx >= 0) {
                jQuery.atmosphere.requests.splice(idx, 1);
            }
        },

        publish: function (request) {
            if (typeof (request.callback) === 'function') {
                jQuery.atmosphere.addCallback(request.callback);
            }
            request.transport = "polling";

            var rq = new jQuery.atmosphere.AtmosphereRequest(request);
            jQuery.atmosphere.requests[jQuery.atmosphere.requests.length] = rq;
            return rq;
        },

        checkCORSSupport: function () {
            if (jQuery.browser.msie && !window.XDomainRequest) {
                return true;
            } else if (jQuery.browser.opera && +jQuery.browser.version.split(".")[0] < 12.0) {
                return true;
            }

            // KreaTV 4.1 -> 4.4
            else if (jQuery.trim(navigator.userAgent).slice(0, 16) === "KreaTVWebKit/531") {
                return true;
            }
            // KreaTV 3.8
            else if (jQuery.trim(navigator.userAgent).slice(-7).toLowerCase() === "kreatel") {
                return true;
            }

            // Force Android to use CORS as some version like 2.2.3 fail otherwise
            var ua = navigator.userAgent.toLowerCase();
            var isAndroid = ua.indexOf("android") > -1;
            if (isAndroid) {
                return true;
            }
            return false;
        },

        S4: function () {
            return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1);
        },

        guid: function () {
            return (jQuery.atmosphere.S4() + jQuery.atmosphere.S4() + "-" + jQuery.atmosphere.S4() + "-" + jQuery.atmosphere.S4() + "-"
                + jQuery.atmosphere.S4() + "-" + jQuery.atmosphere.S4() + jQuery.atmosphere.S4() + jQuery.atmosphere.S4());
        },

        // From jQuery-Stream
        prepareURL: function (url) {
            // Attaches a time stamp to prevent caching
            var ts = jQuery.now();
            var ret = url.replace(/([?&])_=[^&]*/, "$1_=" + ts);

            return ret + (ret === url ? (/\?/.test(url) ? "&" : "?") + "_=" + ts : "");
        },

        // From jQuery-Stream
        param: function (data) {
            return jQuery.param(data, jQuery.ajaxSettings.traditional);
        },

        supportStorage: function () {
            var storage = window.localStorage;
            if (storage) {
                try {
                    storage.setItem("t", "t");
                    storage.removeItem("t");
                    // The storage event of Internet Explorer and Firefox 3 works strangely
                    return window.StorageEvent && !jQuery.browser.msie && !(jQuery.browser.mozilla && jQuery.browser.version.split(".")[0] === "1");
                } catch (e) {
                }
            }

            return false;
        },

        iterate: function (fn, interval) {
            var timeoutId;

            // Though the interval is 0 for real-time application, there is a delay between setTimeout calls
            // For detail, see https://developer.mozilla.org/en/window.setTimeout#Minimum_delay_and_timeout_nesting
            interval = interval || 0;

            (function loop() {
                timeoutId = setTimeout(function () {
                    if (fn() === false) {
                        return;
                    }

                    loop();
                }, interval);
            })();

            return function () {
                clearTimeout(timeoutId);
            };
        },

        log: function (level, args) {
            if (window.console) {
                var logger = window.console[level];
                if (typeof logger === 'function') {
                    logger.apply(window.console, args);
                }
            }
        },

        warn: function () {
            jQuery.atmosphere.log('warn', arguments);
        },

        info: function () {
            jQuery.atmosphere.log('info', arguments);
        },

        debug: function () {
            jQuery.atmosphere.log('debug', arguments);
        },

        error: function () {
            jQuery.atmosphere.log('error', arguments);
        },

        // TODO extract to utils or something
        isBinary: function (data) {
            // True if data is an instance of Blob, ArrayBuffer or ArrayBufferView 
            return /^\[object\s(?:Blob|ArrayBuffer|.+Array)\]$/.test(Object.prototype.toString.call(data));
        }
    };
}();

// http://stackoverflow.com/questions/9645803/whats-the-replacement-for-browser
// Limit scope pollution from any deprecated API
(function () {

    var matched, browser;

    // Use of jQuery.browser is frowned upon.
    // More details: http://api.jquery.com/jQuery.browser
    // jQuery.uaMatch maintained for back-compat
    jQuery.uaMatch = function (ua) {
        ua = ua.toLowerCase();

        var match = /(chrome)[ \/]([\w.]+)/.exec(ua) || 
                /(webkit)[ \/]([\w.]+)/.exec(ua) || 
                /(opera)(?:.*version|)[ \/]([\w.]+)/.exec(ua) || 
                /(msie) ([\w.]+)/.exec(ua) || 
                /(trident)(?:.*? rv:([\w.]+)|)/.exec(ua) ||
                ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec(ua) || 
                [];

        return {
            browser: match[1] || "",
            version: match[2] || "0"
        };
    };

    matched = jQuery.uaMatch(navigator.userAgent);
    browser = {};

    if (matched.browser) {
        browser[matched.browser] = true;
        browser.version = matched.version;
    }

    // Chrome is Webkit, but Webkit is also Safari.
    if (browser.chrome) {
        browser.webkit = true;
    } else if (browser.webkit) {
        browser.safari = true;
    }
    
    // Trident is the layout engine of the Internet Explorer
    // IE 11 has no "MSIE: 11.0" token
    if (browser.trident) {
    	browser.msie = true;
    }

    jQuery.browser = browser;

    jQuery.sub = function () {
        function jQuerySub(selector, context) {
            return new jQuerySub.fn.init(selector, context);
        }

        jQuery.extend(true, jQuerySub, this);
        jQuerySub.superclass = this;
        jQuerySub.fn = jQuerySub.prototype = this();
        jQuerySub.fn.constructor = jQuerySub;
        jQuerySub.sub = this.sub;
        jQuerySub.fn.init = function init(selector, context) {
            if (context && context instanceof jQuery && !(context instanceof jQuerySub)) {
                context = jQuerySub(context);
            }

            return jQuery.fn.init.call(this, selector, context, rootjQuerySub);
        };
        jQuerySub.fn.init.prototype = jQuerySub.fn;
        var rootjQuerySub = jQuerySub(document);
        return jQuerySub;
    };

})();

/*
 * jQuery stringifyJSON
 * http://github.com/flowersinthesand/jquery-stringifyJSON
 *
 * Copyright 2011, Donghwan Kim
 * Licensed under the Apache License, Version 2.0
 * http://www.apache.org/licenses/LICENSE-2.0
 */
// This plugin is heavily based on Douglas Crockford's reference implementation
(function (jQuery) {

    var escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, meta = {
        '\b': '\\b',
        '\t': '\\t',
        '\n': '\\n',
        '\f': '\\f',
        '\r': '\\r',
        '"': '\\"',
        '\\': '\\\\'
    };

    function quote(string) {
        return '"' + string.replace(escapable, function (a) {
            var c = meta[a];
            return typeof c === "string" ? c : "\\u" + ("0000" + a.charCodeAt(0).toString(16)).slice(-4);
        }) + '"';
    }

    function f(n) {
        return n < 10 ? "0" + n : n;
    }

    function str(key, holder) {
        var i, v, len, partial, value = holder[key], type = typeof value;

        if (value && typeof value === "object" && typeof value.toJSON === "function") {
            value = value.toJSON(key);
            type = typeof value;
        }

        switch (type) {
            case "string":
                return quote(value);
            case "number":
                return isFinite(value) ? String(value) : "null";
            case "boolean":
                return String(value);
            case "object":
                if (!value) {
                    return "null";
                }

                switch (Object.prototype.toString.call(value)) {
                    case "[object Date]":
                        return isFinite(value.valueOf()) ? '"' + value.getUTCFullYear() + "-" + f(value.getUTCMonth() + 1) + "-" + f(value.getUTCDate())
                            + "T" + f(value.getUTCHours()) + ":" + f(value.getUTCMinutes()) + ":" + f(value.getUTCSeconds()) + "Z" + '"' : "null";
                    case "[object Array]":
                        len = value.length;
                        partial = [];
                        for (i = 0; i < len; i++) {
                            partial.push(str(i, value) || "null");
                        }

                        return "[" + partial.join(",") + "]";
                    default:
                        partial = [];
                        for (i in value) {
                            if (Object.prototype.hasOwnProperty.call(value, i)) {
                                v = str(i, value);
                                if (v) {
                                    partial.push(quote(i) + ":" + v);
                                }
                            }
                        }

                        return "{" + partial.join(",") + "}";
                }
        }
    }

    jQuery.stringifyJSON = function (value) {
        if (window.JSON && window.JSON.stringify) {
            return window.JSON.stringify(value);
        }

        return str("", {
            "": value
        });
    };

}(jQuery));
/* jshint noarg:true, noempty:true, eqeqeq:true, evil:true, laxbreak:true, undef:true, browser:true, jquery:true, indent:false, maxerr:50, eqnull:true */