var XMLHttpRequestInternal = XMLHttpRequest;
        XMLHttpRequest = function() {
            this.onreadystatechange = function() { };
            this.readyState = 0;
            this.response = null;
            this.responseText = null;
            this.responseType = "";
            this.responseURL = null;
            this.responseXML = null;
            this.status = 0;
            this.statusText = "";
            this.timeout = 0;
            this._loadcallbacks = [];
            this._errorcallbacks = [];
            this._progresscallbacks = [];
            this._loadstartcallbacks = [];
            this._loadendcallbacks = [];
            this._timeoutcallbacks = [];
            this._headers = [];
            this.onload = function(e) {

            }

            this.onerror = function(e) {

            }

            this.onprogress = function(e) {

            }

            this.onloadstart = function(e) {

            }

            this.onloadend = function(e) {

            }

            this.ontimeout = function(e) {

            }

            this.abort = function() {
                this._aborted = true;
            };

            this.addEventListener = function(event, callback) {
                if(event === "load") {
                    this._loadcallbacks.push(callback);
                } else if(event == "error") {
                    this._errorcallbacks.push(callback);
                } else if(event == "progress") {
                    this._progresscallbacks.push(callback);
                } else if(event == "loadstart") {
                    this._loadstartcallbacks.push(callback);
                } else if(event == "loadend") {
                    this._loadendcallbacks.push(callback);
                } else if(event == "timeout") {
                    this._timeoutcallbacks.push(callback);
                } else {
                    console.log("Unknown event");
                    debugger;
                }
            };

            this.getAllResponseHeaders = function() {
                return null;
            };

            this.setRequestHeader = function(header, value) {
                this._headers.push([header, value]);
            }

            this.open = function (method, url, async, user, password) {
                this._method = method;
                this._url = url;

                if(async != null) {
                    this._async = async;
                } else {
                    this._async = true;
                }

                this._user = user;
                this._password = password;
            };

            this.overrideMimeType = function(mime_type) {
                this._overrideMime = mime_type;
            };

            this.send = function(post_data) {
                if(!this._url) {
                    return;
                }

                let this_ref = this;
                if(this._url.includes("vod.dori") == false) {
                    let xhr = new XMLHttpRequestInternal();
                    xhr.responseType = this.responseType;

                    if(this._overrideMime) {
                        xhr.overrideMimeType(this._overrideMime);
                    }

                    this.abort = function() {
                        xhr.abort();
                    }


                    this_ref.getAllResponseHeaders = function() {
                        return xhr.getAllResponseHeaders();
                    }

                    this_ref.getResponseHeader = function(name) {
                        return xhr.getResponseHeader(name);
                    }

                    var event = { target: this_ref };
                    for(callback of this_ref._loadstartcallbacks) {
                        callback.call(this_ref);
                    }
                    this_ref.onloadstart(event);

                    xhr.onload = function(event) {
                        if(xhr.readyState == 4) {
                            this_ref.readyState = 1;
                            this_ref.onreadystatechange();
                            this_ref.readyState = 2;
                            this_ref.onreadystatechange();

                            this_ref.status = xhr.status;
                            this_ref.statusText = xhr.statusText;

                            this_ref.readyState = 3;
                            this_ref.onreadystatechange();

                            this_ref.response = xhr.response;
                            this_ref.responseText = xhr.responseText;
                            this_ref.responseXML = xhr.responseXML;
                            this_ref.responseURL = xhr.responseURL;

                            this_ref.readyState = 4;
                            this_ref.onreadystatechange();

                            this_ref.onload(event);
                            for(callback of this_ref._loadcallbacks) {
                                callback.call(this_ref, event);
                            }

                            this_ref.onloadend(event);
                            for(callback of this_ref._loadendcallbacks) {
                                callback.call(this_ref, event);
                            }
                        }
                        else {
                            this_ref.readyState = xhr.readyState;
                            this_ref.onreadystatechange();
                        }
                    }

                    xhr.onerror = function(exception) {
                        this_ref.onerror(exception);
                        for(callback of this_ref._errorcallbacks) {
                            callback.call(this_ref, exception);
                        }

                        this_ref.onloadend(exception);
                        for(callback of this_ref._loadendcallbacks) {
                            callback.call(this_ref, exception);
                        }
                    }

                    xhr.onprogress = function(event) {
                        this_ref.onprogress(event);
                        for(callback of this_ref._progresscallbacks) {
                            callback.call(this_ref, event);
                        }
                    }

                    xhr.ontimeout = function(event) {
                        this_ref.ontimeout(event);
                        for(callback of this_ref._timeoutcallbacks) {
                            callback.call(this_ref, event);
                        }
                    }

                    xhr.open(this_ref._method, this_ref._url, this_ref._async, this_ref._user, this_ref._password);

                    let num_headers = this_ref._headers.length;
                    for(let index = 0; index < num_headers; index += 1) {
                        xhr.setRequestHeader(this._headers[index][0], this._headers[index][1]);
                    }

                    if(this_ref._async) {
                        xhr.timeout = this_ref.timeout;
                    }

                    xhr.send(post_data);

                    if(!this_ref._async) {
                        this_ref.status = xhr.status;
                        this_ref.statusText = xhr.statusText;
                        this_ref.response = xhr.response;
                        this_ref.responseText = xhr.responseText;
                        this_ref.responseXML = xhr.responseXML;
                        this_ref.responseURL = xhr.responseURL;
                    }

                } else {
                    let headers = [];
                    let num_headers = this_ref._headers.length;
                    for(let index = 0; index < num_headers; index += 1) {
                        headers.push(this._headers[index][0] + ": ", this._headers[index][1]);
                    }

                    var event = { target: this_ref };
                    for(callback of this_ref._loadstartcallbacks) {
                        callback.call(this_ref);
                    }
                    this_ref.onloadstart(event);

                    requester.request(this._url, post_data, headers).then(function(http) {

                        this_ref.readyState = 1;
                        this_ref.onreadystatechange();
                        this_ref.readyState = 2;
                        this_ref.onreadystatechange();

                        this_ref.status = http.status;
                        this_ref.statusText = http.statusText;

                        this_ref.readyState = 3;
                        this_ref.onreadystatechange();

                        let is_xml = false;
                        if(this_ref._overrideMime) {
                            if(this_ref._overrideMime === "application/xml" || this_ref._overrideMime == "text/xml") {
                                is_xml = true;
                            }
                        } else {
                            let headers = http.getAllResponseHeaders().toLowerCase();

                            if(headers.includes("content-type: application/xml") || headers.includes("content-type: text/xml")) {
                                is_xml = true;
                            }
                        }

                        if(is_xml) {
                            parser = new DOMParser();
                            this_ref.responseXML = parser.parseFromString(this_ref.responseText, "text/xml");
                        }

                        this_ref.response = http.response;
                        this_ref.responseText = http.responseText;
                        this_ref.responseURL = this_ref._url;

                        this_ref.readyState = 4;
                        this_ref.onreadystatechange();

                        this_ref.onload(event);
                        for(callback of this_ref._loadcallbacks) {
                            callback.call(this_ref, event);
                        }

                        this_ref.onloadend(event);
                        for(callback of this_ref._loadendcallbacks) {
                            callback.call(this_ref, event);
                        }
                    }, function(exception) {

                        this_ref.onerror(exception);
                        for(callback of this_ref._errorcallbacks) {
                            callback.call(this_ref, exception);
                        }

                        this_ref.onloadend(exception);
                        for(callback of this_ref._loadendcallbacks) {
                            callback.call(this_ref, exception);
                        }
                    });
                }
            };
        };

        XMLHttpRequest.prototype = {
            'UNSENT': 0,
            'OPENED': 1,
            'HEADERS_RECIEVED': 2,
            'LOADING': 3,
            'DONE': 4,
        };