即将跳转到外部网站,安全性未知,是否继续?
https://github.com/spring-projects/spring-framework/blob/0dd9e8ce022d2dce6d612ba52681ac97fdc39d4e/spring-webmvc/src/main/java/org/springframework/web/servlet/FrameworkServlet.java#L1090-L1106