docs: protected Api getApi(String orgId, String apiId, String version) throws IOException {
          String apiIdx = getApiIdx(orgId, apiId, version);
          Api api;
          synchronized (mutex) {
              api = apiCache.get(apiIdx);
          }
  
          if (api == null) {
              api = super.getApi(getApiId(orgId, apiId, version));
              synchronized (mutex) {
                  if (api != null) {
                      apiCache.put(apiIdx, api);
                  }
              }
          }
  
          return api;
      }