springboot 程序中，服务器重启，登录状态丢失，刷新 index.html 页面，跳转回 druid/login.html，而不是自定义的 url-pattern/login.html 地址

springboot 程序中，服务器重启，登录状态丢失，刷新 index.html 页面，跳转回 druid/login.html，而不是自定义的 url-pattern/login.html 地址。
原因在于 springboot 启动后，context path 为空，ResourceServlet 中判断未登录后，依照 context path 跳转的路径有误

Start with ResourceServlet and trace the unauthenticated redirect when the Spring Boot context path is empty after a server restart. Reproduce by refreshing index.html after login state is lost, then verify that the redirect uses the configured url-pattern/login.html rather than druid/login.html.

Written by the indexing model from the issue text.