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    <title>Web Cache Deception on Answer</title>
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      <title>Expires已死,Cache-Control永生:HTTP缓存头部的二十年演进史</title>
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      <description>深入剖析HTTP缓存机制从Expires到Cache-Control的演进历程。从时钟同步问题到max-age的相对时间设计,从no-cache的命名陷阱到immutable指令的最佳实践,系统梳理浏览器、CDN、代理服务器如何协同处理缓存头部。基于RFC 2616、RFC 7234、RFC 5861等官方规范和真实生产事故案例,揭示Vary头部爆炸、缓存投毒、Web Cache Deception等安全风险,以及stale-while-revalidate、stale-if-error等现代扩展的实际应用。</description>
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