CDN 緩存
使用CDN之後，文件如何更新
1，主動推送文件到CDN節點
https://help.aliyun.com/knowledge_detail/40106.html?spm=5176.10695662.1996646101.searchclickresult.5e9c8434pZrMKc
2，如何查看一個URL是否命中CDN緩存
https://help.aliyun.com/knowledge_detail/40122.html?spm=5176.10695662.1996646101.searchclickresult.7eba62c217Sul0
3，CDN緩存命中率下降的因素有哪些？
https://help.aliyun.com/knowledge_detail/40191.html?spm=5176.7840185.2.3.YqYkHV
https://help.aliyun.com/knowledge_detail/40108.html?spm=5176.7840208.2.7.JHv58m
4，CDN節點默認緩存策略
https://help.aliyun.com/knowledge_detail/47580.html
5，CDN緩存配置
https://help.aliyun.com/document_detail/27136.html?spm=5176.doc62975.6.581.mQUede
6，CDN刷新緩存
https://help.aliyun.com/document_detail/27140.html?spm=5176.doc27136.6.596.PhRGHK
7，CDN設置某個目錄或文件不緩存
https://help.aliyun.com/knowledge_detail/40192.html?spm=5176.11065259.1996646101.searchclickresult.33dd794cqcgQ4P