Comments (3)
*Expires 是由服务端返回的资源过期时间(GTM 日期格式/时间戳),若用户本地时间在过期时间前,则不发送请求直接从本地获取资源。
GTM→GMT
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*ETag 还可以配合 If-Match 检测当前请求是否为最新版本,若资源不匹配返回状态码 412 错误。(If-Match 不加 W/ 时使用强比较算法)。
括号前面多了一个句号
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缓存不能用该资源响应后续请求。
改成 浏览器/代理服务器不能使用该缓存资源响应后续请求
感觉好点
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