code: @Deprecated
      public Configuration copy() {
          Configuration copy = new Configuration();
          copy.apiUrl = apiUrl;
          copy.domain = domain;
          copy.apiKey = apiKey;
          copy.mailRequestCallbackFactory = mailRequestCallbackFactory;
          copy.mailSendFilter = mailSendFilter;
          //noinspection Convert2Diamond
          copy.defaultParameters = new MultivaluedHashMap<String,String>(defaultParameters); //NOSONAR
          copy.converters.addAll(converters);
          return copy;
      }
docs: Creates a copy of this configuration.
  
  @return a copy of this configuration
  @deprecated it's not clear what a 'copy' is so this method will be removed