const electron = require("electron")const app = electron.appconst net = electron.netapp.on("ready", function() {    const request = net.request("http://www.baidu.com")        /*request.on("response", function(response) {            console.log(response.statusCode)            request.end()        })*/    var head = request.getHeader()    console.log(head)})為啥這些代碼沒有執行？？？打印不出來內容？？