强缓存
Expires
catch-control
协商缓存
Last-Modified (If-Modified-Since)
ETag (If-None-Matched)
禁止浏览器缓存
CacheControl = no-cachePragma=no-cacheExpires = -1
浏览器缓存
原文：https://www.cnblogs.com/vicky24k/p/11746287.html
