docs: def _api_item_history(self, plugin, item, nb=0):
          """Glances API RESTful implementation.
  
          Return the JSON representation of the couple plugin/history of item
          HTTP/200 if OK
          HTTP/400 if plugin is not found
          HTTP/404 if others error
  
          """
          return self._api_itemvalue(plugin, item, history=True, nb=int(nb))