docs: public com.squareup.okhttp.Call getUniverseFactionsAsync(String acceptLanguage, String datasource,
              String ifNoneMatch, String language, final ApiCallback<List<FactionsResponse>> callback)
              throws ApiException {
  
          com.squareup.okhttp.Call call = getUniverseFactionsValidateBeforeCall(acceptLanguage, datasource, ifNoneMatch,
                  language, callback);
          Type localVarReturnType = new TypeToken<List<FactionsResponse>>() {
          }.getType();
          apiClient.executeAsync(call, localVarReturnType, callback);
          return call;
      }