Apache Tomcat 8 (8.5.38) - Documentation Index
https://tomcat.apache.org/tomcat-8.5-doc/index.html
tomcat8和tomcat7差别大吗新项目应该选择哪个? - 知乎
https://www.zhihu.com/question/53784933
在tomcat8.0.x和tomcat9.0.x之间么突然冒出个tomcat 8.5？ - 知乎
https://www.zhihu.com/question/52255668