拥有对 CertificateHandler 对象的引用，该对象可管理此 UnityWebRequest 的证书验证。
将此属性设置为 null 可使平台使用默认证书验证。一些平台将根据根证书授权商店来验证证书。其他平台则会完全绕过证书验证。
并非所有品台都支持证书验证回调。请参阅 CertificateHandler 了解受支持的平台列表。
调用 Send 后将无法更改此属性。
默认值：null。
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