什么是cdn？CDN既内容分发网络（Content Delivery Network，CDN），是在现有 Internet 中增加的一层新的网络架构，由遍布全球的高性能加速节点构成。这些高性能的服务节点都会按照一定的缓存策略存储您的业务内容，当您的用户向您的某一业务内容发起请求时，请求会被调度至最接近用户的服务节点，直接由服务节点快速响应，有效降低用户访问延迟，提升可用性。
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