Holds a reference to a CertificateHandler object, which manages certificate validation for this UnityWebRequest.
Setting this property to null makes the platform use the default certificate validation. Some platforms will validate certificates against a root certificate authority store. Other platforms will simply bypass certificate validation completely.
Not all platforms support certificate validation callbacks. See CertificateHandler for a list of supported platforms.
Send を呼び出した後、このプロパティーは変更できません。
既定値: null