In the closing pages/uninstall (unload) sends a request to the server before the document

Official introduction: https://developer.mozilla.org/zh-CN/docs/Web/API/Navigator/sendBeacon
For reference: https://www.jianshu.com/p/04e88271a8f2?from
Ultimate Solution:

window.addEventListener("beforeunload", (e) => {const data = {name: "tm"};window.navigator.sendBeacon("http://127.0.0.1:1891/loginout", JSON.stringify(data));});

Whether the page is refreshed or closed, the backend can receive the request sent by the frontend, perfectly fulfilling the requirement.