Error return codes are given because the certificate is potentially unsafe.
由于证书可能是不安全的，因此会返回错误代码。
The worker wasn't allowed to return to his own country without a certificate from his agent stating he owned nothing.
没有其代理人出具的无欠债的证明，工人是不允许回到自己国家的。
Typically if the return code is not X509_V_OK, there is a problem with the certificate or the security surrounding the certificate.
通常，如果返回代码不是 X509_V_OK，那么这个证书就有问题，或者这个证书存在安全性隐患。
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