code: private String downloadCertWithRetries(URI certUrl) {
          try {
              return downloadCert(certUrl);
          } catch (SdkBaseException e) {
              if (isRetryable(e)) {
                  return downloadCert(certUrl);
              } else {
                  throw e;
              }
          }
      }
docs: Downloads the certificate from the provided URL, retrying once if applicable.
  
  @param certUrl URL to download certificate from.
  @return String contents of certificate.