docs: private void applyCacheHeaders(final Properties cacheProperties, final httpClientInteraction method) {
          if (isCachedContentPresent() && null != contentType) {
              if (cacheProperties.containsKey(E_TAG)) {
                  method.setRequestHeader(IF_NONE_MATCH, cacheProperties.getProperty(E_TAG));
              }
              if (cacheProperties.containsKey(LAST_MODIFIED)) {
                  method.setRequestHeader(IF_MODIFIED_SINCE, cacheProperties.getProperty(LAST_MODIFIED));
              }
          }
      }