java - What is the difference between thread per connection vs thread per request? - Stack Overflow
https://stackoverflow.com/questions/15217524/what-is-the-difference-between-thread-per-connection-vs-thread-per-request
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https://en.wikipedia.org/wiki/Comet_%28programming%29
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http://www.cnblogs.com/zhuawang/p/5213192.html
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https://www.open-open.com/lib/view/open1401931407228.html
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http://www.cnblogs.com/ggjucheng/archive/2013/04/16/3024731.html
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https://blog.csdn.net/centre10/article/details/50639693
tomcat常用配置詳解和優化方法 - xuwc - 部落格園
https://www.cnblogs.com/xuwc/p/8523681.html
Tomcat 伺服器效能優化_百度經驗
https://jingyan.baidu.com/article/7f41ececf6b34d593d095cad.html