Qiniu private bucket files are cached on cdn. how can this problem be solved?

After the private bucket file of Qiniu is accessed through the generated Qiniu temporary token (the validity period of the temporary token is 5 seconds), the token is accessed again after expiration and can still be accessed, the answer to Qiniu is that the Accessed file is cached by the cdn node and can only be resolved through a custom domain name, but I don't want... after the private bucket file of Qiniu is accessed through the generated Qiniu temporary token (the validity period of the temporary token is 5 seconds), the token is accessed again after expiration and can still be accessed, the answer to Qiniu is that the Accessed file is cached by the cdn node and can only be resolved through a custom domain name. However, I do not want to provide a certificate to Qiniu, how can I solve this problem?
THX

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After the private bucket file of Qiniu is accessed through the generated Qiniu temporary token (the validity period of the temporary token is 5 seconds), the token is accessed again after expiration and can still be accessed, the answer to Qiniu is that the Accessed file is cached by the cdn node and can only be resolved through a custom domain name. However, I do not want to provide a certificate to Qiniu, how can I solve this problem?
THX

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