code: private String retrieveFromCache(String url) {
          String savedJson;
  
          savedJson = mCacheQueryHandler.get(getContext(), url);
          log("---------- body found in offline saver : " + savedJson);
          log("----- NO NETWORK : retrieving ends");
          return savedJson;
      }
docs: Get a saved body for a given url.
  
  @param url url for which we need to retrieve the response body in offline mode.
  @return response body as string.