在Http协议的Response Header中,可根据以下两项来判断是否被缓存命中。
X-Cache:HIT from www.cdn.com X-Via:代理服务器地址信息
x-cache-lookup:指专门查看代理服务器中是否有某个网页缓存:有就返回HIT,没有返回MISS。
x-cache:项指浏览器从何处、是在哪个代理缓存载入的网页文件:服务器名后的3128指服务器端口。
注:X-Via 未查到相关资料说明
可通过对Response Header进行以下配置来进行设置,不被任何代理缓存命中,每次取最新信息
// Http 1.0 header response.setDateHeader("Expires", 1L); response.addHeader("Pragma", "no-cache"); // Http 1.1 header response.setHeader("Cache-Control", "no-cache, no-store, max-age=0");
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