This is absolutely necessary for verification of the peer certificate to succeed.

这是成功验证每个证书所必需的。

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Retrieving the peer certificate is necessary if you wish to either display it to the user or verify it either against the host name or the certificate authority.

如果您希望向用户显示证书的内容，或者要根据主机名或证书权威对证书进行验证，那么就需要检索证书的内容。

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OPTIONAL - if the peer SSL client sends a certificate, the certificate is processed as normal but authentication does not fail if no certificate is sent.

OPTIONAL——如果对等ssl客户端发送一个证书，则该证书被正常处理；如果该客户端不发送任何证书，验证并不失败。

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