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Integer constants:

SSL_ERROR_ZERO_RETURN
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SSL_ERROR_WANT_X509_LOOKUP
SSL_ERROR_SYSCALL
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CERT_OPTIONAL - certificates are not required, but if provided will be
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CERT_REQUIRED - certificates are required, and will be validated, and
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PROTOCOL_SSLv23
PROTOCOL_TLS
PROTOCOL_TLSv1
PROTOCOL_TLSv1_1
PROTOCOL_TLSv1_2

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ALERT_DESCRIPTION_HANDSHAKE_FAILURE
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ALERT_DESCRIPTION_ILLEGAL_PARAMETER
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ALERT_DESCRIPTION_UNSUPPORTED_EXTENSION
ALERT_DESCRIPTION_CERTIFICATE_UNOBTAINABLE
ALERT_DESCRIPTION_UNRECOGNIZED_NAME
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