code: func LoadPEMCertPool(certsFile string) (*x509.CertPool, error) {
  	if certsFile == "" {
  		return nil, nil
  	}
  	pemCerts, err := ioutil.ReadFile(certsFile)
  	if err != nil {
  		return nil, err
  	}
  
  	return PEMToCertPool(pemCerts)
  }
docs: // LoadPEMCertPool loads a pool of PEM certificates from file.