https://www.darrenfang.com/2015/01/setting-up-http-cache-and-gzip-with-nginx/
https://www.linuxdashen.com/nginx%E6%9C%8D%E5%8A%A1%E5%99%A8%E5%A6%82%E4%BD%95%E5%90%AF%E7%94%A8gzip%E5%8E%8B%E7%BC%A9%E5%8A%9F%E8%83%BD
原文：http://www.cnblogs.com/sos-blue/p/7310290.html