Seven bull private bucket files are cached in CDN how to Solve

After accessing the seven KN private bucket file through the generated seven bull temporary token (the temporary token is valid for 5 seconds), the token expires and is accessible again, and the reply to seven KN is that the file accessed is cached by the CDN node and can only be resolved by a custom domain name, but I do not want to provide a certificate for seven cattle. I would like to ask you prawns this problem how to solve is good?
Thx

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After accessing the seven KN private bucket file through the generated seven bull temporary token (the temporary token is valid for 5 seconds), the token expires and is accessible again, and the reply to seven KN is that the file accessed is cached by the CDN node and can only be resolved by a custom domain name, but I do not want to provide a certificate for seven cattle. I would like to ask you prawns this problem how to solve is good?
Thx

Seven cows web background cleanup cache
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