private static final ASN1ObjectIdentifier OID_KRB = new ASN1ObjectIdentifier(SpnegoConstants.KERBEROS_MECHANISM);
    private static final ASN1ObjectIdentifier OID_KRB_LEGACY = new ASN1ObjectIdentifier(SpnegoConstants.LEGACY_KERBEROS_MECHANISM);
    private static final ASN1ObjectIdentifier OID_NTLM = new ASN1ObjectIdentifier(SpnegoConstants.NTLMSSP_MECHANISM);
    private static final String SPNEGO_OID_STR = SpnegoConstants.SPNEGO_MECHANISM;