The server controls various browsers to prohibit caching of page resources Study Notes

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Demo2 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

                //服务端控制各种浏览器禁止缓存页面资源
                response.setHeader("expires","-1");
                response.setHeader("cache-control","no-cache");
                response.setHeader("pragma","no-cache");

                //服务端向浏览器输出内容
                response.getWriter().write("haha");             

    }

}

Summary:
What kind of behavior do you want the browser to have? The server can only set
what kind of behavior it wants the server to know through the response header. The browser can only set it through the request header.