The data retrieval process through Alibaba Cloud CDN is as follows: When receiving a user request, Alibaba Cloud CDN looks for the requested data on first-level nodes and second-level nodes in sequence. If the nodes do not have the requested data. Alibaba Cloud CDN retrieves the data from the origin site and synchronizes it to second-level nodes and first-level nodes in sequence. Then the data is returned to the user from first-level nodes.
For details about the default cache rules of Alibaba Cloud CDN, refer to Cache refresh.
To achieve optimal Alibaba Cloud CDN usage, it is recommended that dynamic and static pages be separated and static pages be delivered through a Alibaba Cloud CDN domain.
All files, including static and dynamic files, may be cached by Alibaba Cloud CDN if the files are not set to no-cache
If the problem persists, contact Alibaba Cloud After-Sales Technical Support.