| 123456789101112131415161718192021 | // +build !windowspackage tlsimport "crypto/x509"func (c *Config) getCertPool() *x509.CertPool {	pool, err := x509.SystemCertPool()	if err != nil {		newError("failed to get system cert pool.").Base(err).WriteToLog()		return nil	}	if pool != nil {		for _, cert := range c.Certificate {			if cert.Usage == Certificate_AUTHORITY_VERIFY {				pool.AppendCertsFromPEM(cert.Certificate)			}		}	}	return pool}
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