docs: public com.squareup.okhttp.Call getCharactersCharacterIdCalendarAsync(Integer characterId, String datasource,
              Integer fromEvent, String ifNoneMatch, String token,
              final ApiCallback<List<CharacterCalendarResponse>> callback) throws ApiException {
  
          com.squareup.okhttp.Call call = getCharactersCharacterIdCalendarValidateBeforeCall(characterId, datasource,
                  fromEvent, ifNoneMatch, token, callback);
          Type localVarReturnType = new TypeToken<List<CharacterCalendarResponse>>() {
          }.getType();
          apiClient.executeAsync(call, localVarReturnType, callback);
          return call;
      }