Method open

src/engine-wrapper.js:29–46

(method, url)

        }

        open(method, url) {
            this.method = method;
            if (!url) {
                url = location.href;
            } else {
                url = util.trim(url);
                if (url.indexOf("http") !== 0) {
                    // Normalize the request url
                    if (isBrowser) {
                        let t = document.createElement("a");
                        t.href = url;
                        url = t.href;
                    }
                }
            }
            this.responseURL = url;
            this._changeReadyState(1)
        }

        send(arg) {
            arg = arg || null;