can the following experiment summarize the principle in a few short sentences? At present, all I know is that the facts are as follows

:Tomcat

:localhost:8080/project
Servlet:localhost:8080/project/MyCookie

localhost:8080/project/MyCookieServlet:

public class MyCookie extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=utf-8");

        Cookie[] cookies = request.getCookies();
        for(int i = 0; cookies != null && i < cookies.length;iPP){
            //,cookie
            response.getWriter().println("cookie  cookies[i].getName():"+cookies[i].getName()+cookies[i].getValue());
        }
    }
}

:

1.,TomcatCookie,
    :
 Set-Cookie:JSESSIONID=544F9C73731E416ECC15CF5A204C2023; Path=/project; HttpOnly;

2.,Tomcat
    Cookie,,cookie,:
      Cookie:JSESSIONID=544F9C73731E416ECC15CF5A204C2023

3Cookie;

4.Servletlocalhost:8080/project/MyCookie ,
,Servlet,Cookie

5),(4)Servlet,
Servletcookie