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DNS攻击、2023年MaginotDNS，再到2025年CVE-2025-40778，揭示这场持续二十年的攻防博弈背后的协议缺陷、防御措施与突破手段。 https://answer.freetools.me/expires%E5%B7%B2%E6%AD%BBcache-control%E6%B0%B8%E7%94%9Fhttp%E7%BC%93%E5%AD%98%E5%A4%B4%E9%83%A8%E7%9A%84%E4%BA%8C%E5%8D%81%E5%B9%B4%E6%BC%94%E8%BF%9B%E5%8F%B2/ Fri, 06 Mar 2026 21:21:14 +0800 https://answer.freetools.me/expires%E5%B7%B2%E6%AD%BBcache-control%E6%B0%B8%E7%94%9Fhttp%E7%BC%93%E5%AD%98%E5%A4%B4%E9%83%A8%E7%9A%84%E4%BA%8C%E5%8D%81%E5%B9%B4%E6%BC%94%E8%BF%9B%E5%8F%B2/ 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。 https://answer.freetools.me/%E9%9B%B6%E5%BE%80%E8%BF%94%E7%9A%84%E4%BB%A3%E4%BB%B7http/3-0-rtt-%E4%B8%BA%E4%BD%95%E6%88%90%E4%B8%BA%E5%BC%80%E5%8F%91%E8%80%85%E5%BF%85%E9%A1%BB%E6%AD%A3%E8%A7%86%E7%9A%84%E5%AE%89%E5%85%A8%E9%99%B7%E9%98%B1/ Fri, 06 Mar 2026 13:59:57 +0800 https://answer.freetools.me/%E9%9B%B6%E5%BE%80%E8%BF%94%E7%9A%84%E4%BB%A3%E4%BB%B7http/3-0-rtt-%E4%B8%BA%E4%BD%95%E6%88%90%E4%B8%BA%E5%BC%80%E5%8F%91%E8%80%85%E5%BF%85%E9%A1%BB%E6%AD%A3%E8%A7%86%E7%9A%84%E5%AE%89%E5%85%A8%E9%99%B7%E9%98%B1/ 从TLS 1.3的设计困境出发，深度剖析HTTP/3 0-RTT连接重用的安全漏洞。文章基于RFC 8446、RFC 8470、RFC 9001、RFC 9114等官方规范，以及USENIX Security、EuroS&P等顶级会议论文，系统解析0-RTT重放攻击的技术原理、实际威胁场景与防御机制。涵盖Cloudflare的保守策略、425状态码的设计初衷、以及开发者需要遵循的最佳实践。 https://answer.freetools.me/%E4%BA%8C%E7%BB%B4%E7%A0%81%E4%B8%BA%E4%BD%95%E6%88%90%E4%B8%BA%E9%BB%91%E5%AE%A2%E7%9A%84%E6%96%B0%E5%AE%A0%E4%BB%8E%E4%BE%BF%E5%88%A9%E5%BA%97%E5%88%B0%E5%85%A8%E7%90%83%E6%94%AF%E4%BB%98%E7%9A%84%E6%8A%80%E6%9C%AF%E5%8F%8C%E5%88%83%E5%89%91/ Fri, 06 Mar 2026 06:38:00 +0800 https://answer.freetools.me/%E4%BA%8C%E7%BB%B4%E7%A0%81%E4%B8%BA%E4%BD%95%E6%88%90%E4%B8%BA%E9%BB%91%E5%AE%A2%E7%9A%84%E6%96%B0%E5%AE%A0%E4%BB%8E%E4%BE%BF%E5%88%A9%E5%BA%97%E5%88%B0%E5%85%A8%E7%90%83%E6%94%AF%E4%BB%98%E7%9A%84%E6%8A%80%E6%9C%AF%E5%8F%8C%E5%88%83%E5%89%91/ 深入解析二维码的技术原理与安全风险。从1994年Denso Wave发明二维码，到Reed-Solomon纠错编码的数学基础，再到2024年Quishing钓鱼攻击激增270%的现状，系统梳理二维码如何从工业标识演变为全球支付基础设施——以及其设计缺陷如何被攻击者系统性利用。基于ISO/IEC 18004规范、IEEE论文和FBI安全警告，揭示二维码"信任假设"的根本漏洞。 https://answer.freetools.me/tls-1.3-%E4%B8%8E-quic%E4%BA%92%E8%81%94%E7%BD%91%E4%BC%A0%E8%BE%93%E5%B1%82%E5%8D%81%E5%B9%B4%E9%87%8D%E6%9E%84%E7%9A%84%E6%8A%80%E6%9C%AF%E9%80%BB%E8%BE%91/ Wed, 04 Mar 2026 18:56:06 +0800 https://answer.freetools.me/tls-1.3-%E4%B8%8E-quic%E4%BA%92%E8%81%94%E7%BD%91%E4%BC%A0%E8%BE%93%E5%B1%82%E5%8D%81%E5%B9%B4%E9%87%8D%E6%9E%84%E7%9A%84%E6%8A%80%E6%9C%AF%E9%80%BB%E8%BE%91/ 深入解析 TLS 1.3 与 QUIC 协议的技术演进：从 TLS 1.2 握手的结构性缺陷到 TLS 1.3 的 1-RTT 重构，从 TCP 队头阻塞到 QUIC 的流独立恢复机制。揭示协议僵化、中间件兼容性、用户态性能开销等工程挑战，以及连接迁移、0-RTT 恢复等新特性背后的安全权衡。