Function if

cups/getputfile.c:161–178

    }
#ifdef HAVE_TLS
    else if (status == HTTP_STATUS_UPGRADE_REQUIRED)
    {
      /* Flush any error message... */
      httpFlush(http);

      /* Reconnect... */
      if (httpReconnect2(http, 30000, NULL))
      {
        status = HTTP_STATUS_ERROR;
        break;
      }

      /* Upgrade with encryption... */
      httpEncryption(http, HTTP_ENCRYPTION_REQUIRED);

      /* Try again, this time with encryption enabled... */
      continue;
    }
#endif /* HAVE_TLS */
  }
  while (status == HTTP_STATUS_UNAUTHORIZED || status == HTTP_STATUS_UPGRADE_REQUIRED);