https://www.cnblogs.com/digdeep/p/6107501.html
2016年11月27日 ... 报错的场景是：一个消息的群发，群里总共有50多个人，一群发tomcat 就崩溃 ...
Whenever the underlying OS cannot allocate a new native thread, ... There,
persistent connections may reduce the number of costly ... One example is "404:
File Not Found" error), the server usually sends a small response body to ...
