直播私有 CDN 选型：为什么平时能跑的架构，扛不住顶级赛事的峰值？
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Lua Resty DNS 库
Yichun Zhang , 12 Nov 2012 (created 12 Nov 2012)Nonblocking DNS (Domain Name System) resolver for Lua Nginx Module based on the cosocket API.
Project homepage: https://github.com/agentzh/lua-resty-dns
This library is enabled by default. You can specify the --without-lua_resty_dns option
to OpenResty's ./configure script to explicitly disable it.
