How to solve the problem that Qiniu private bucket files are cached on CDN

After accessing the Qiniu private bucket file through the generated Qiniu temporary token (the temporary token is valid for 5 seconds), you can still access it after the token expires. The answer you got after contacting Qiniu is that the accessed file is still valid. The file is cached by the CDN node and can only be solved by customizing the domain name, but I don’t want to provide a certificate to Qiniu. Could you please tell me how to solve this problem?
THX

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After accessing the Qiniu private bucket file through the generated Qiniu temporary token (the temporary token is valid for 5 seconds), you can still access it after the token expires. The answer you got after contacting Qiniu is that the accessed file is still valid. The file is cached by the CDN node and can only be solved by customizing the domain name, but I don’t want to provide a certificate to Qiniu. Could you please tell me how to solve this problem?
THX

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