https://github.com/netty/netty/issues/2515
参考：
https://juejin.im/entry/5b558d62e51d4519596b95c5
https://juejin.im/post/5c1c532551882579520b1f47?utm_source=gold_browser_extension
http://t.zijieimg.com/PRUmFN/
https://segmentfault.com/q/1010000000190024
https://blog.csdn.net/yezhenxu1992/article/details/51731237
https://www.cnblogs.com/pugang/p/5874958.html
https://zhidao.baidu.com/question/362861325111120052.html
https://www.cnblogs.com/bhlsheji/p/5330045.html
https://blog.csdn.net/wenqian1991/article/details/46546477
https://blog.csdn.net/yexiangCSDN/article/details/86071119
原文：https://www.cnblogs.com/colin-xun/p/11448187.html