Why Do Users Still Access the Stale Resource After It Has Been Updated on the Origin Server and Its Cache on CDN Has Been Purged?

Possible causes:

1. You have prefetched resources before purge and the operation interval may be too short. It is recommended that the interval be longer than 5 minutes.
2. Resource update is not complete on the origin server before purge. As a result, CDN cannot pull the updated resource.
3. The URL entered for purge is incorrect, or the directory does not contain the resource. Take domain name example.com and image /test/test1/1.jpg as an example.
   1. When you set the purge type to URL, the entered resource URL should be http://example.com/test/test1/1.jpg.
   2. When you set the purge type to Directory, the entered resource URL should be http://example.com/test/. If you enter http://example.com/test/test1/, CDN cannot pull the image.
4. No parameter is contained during purge. If the resource URL contains parameters and you have set a cache rule for this resource to retain all or specific parameters, the parameters must be contained during purge.