Keep in mind that the user has left the application (or the browser crashed) and now the user returns to the form page, using a GET request.
请记住，用户曾经离开了应用程序(或者浏览器崩溃)，现在用户使用一个GET请求返回到表单页面。
The result is that when a user loads a page, it sends a request for a JSP that gets passed to the application server.
结果是当用户装载页面时，它发送对JSP的请求，这个请求传递给应用服务器。
For a Web application, developers often want to display the last request time on a page.
对于网络程序，开发员想要显示页面上的最新请求时间。
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