That is a known bug in Apache Tomcat 9.0.24. It is triggered by sending plain text to an TLS enabled connector. It is safe to ignore but since it is rather noisy you probably want to upgrade to the recently released 9.0.26 where this has been fixed.

简单来说就是spring-boot中tomcat版本是9.0.24或者9.0.25版本的，这两个版本有两个bug就是你的服务如果是https的时候，接受到http请求的时候就会报这个错，但是对业务无影响；

解决方案：

    忽略对应错误或者升级tomcat版本到9.0.26及以上版本