可追踪性的重要性在于能够帮助你检测和校验系统。
Traceability is an important capability that helps you validate and verify your system.
第三条规则是鼓励政策合规准则和校验方法的定义。
Rule three encourages the definition of the policy compliance criteria and mechanisms for their verification.
除了使用新鲜度信息和校验，你还有很多方法使你的网站缓存友好。
Besides using freshness information and validation, there are a number of other things you can do to make your site more cache-friendly.
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