code: private String getSSLContextProperty(String propertyName, Properties prop) {
          String value = null;
  
          if (prop != null) {
              value = prop.getProperty(propertyName);
          } else {
              value = System.getProperty(propertyName);
  
              if (value == null) {
                  value = SSLConfigManager.getInstance().getGlobalProperty(propertyName);
              }
          }
  
          return value;
      }
docs: object prop