A list of items (from a feed, a category or from URLs made with SPECIAL_ITEMS_URL)

        Returns a dict with
         :param id: (str, feed's id)
         :param continuation: (str, to be used to fetch more items)
         :param items:  array of dits with :
            - update (update timestamp)
            - author (str, username)
            - title (str, page title)
            - id (str)
            - content (dict with content and direction)
            - categories (list of categories including states or ones provided by the feed owner)

def _getFeedContent(self, url, excludeRead=False, continuation=None, loadLimit=20, since=None, until=None):
        """
        A list of items (from a feed, a category or from URLs made with SPECIAL_ITEMS_URL)

        Returns a dict with
         :param id: (str, feed's id)
         :param continuation: (str, to be used to fetch more items)
         :param items:  array of dits with :
            - update (update timestamp)
            - author (str, username)
            - title (str, page title)
            - id (str)
            - content (dict with content and direction)
            - categories (list of categories including states or ones provided by the feed owner)
        """
        parameters = {}
        if excludeRead:
            parameters['xt'] = 'user/-/state/com.google/read'
        if continuation:
            parameters['c'] = continuation
        parameters['n'] = loadLimit
        if since:
            parameters['ot'] = since
        if until:
            parameters['nt'] = until
        contentJson = self.httpGet(url, parameters)
        return json.loads(contentJson, strict=False)