async def get(self,request_configuration: Optional[RequestConfiguration[ActivityHistoryItemItemRequestBuilderGetQueryParameters]] = None) -> Optional[ActivityHistoryItem]:
        """
        Optional. NavigationProperty/Containment; navigation property to the activity's historyItems.
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[ActivityHistoryItem]
        """
        request_info = self.to_get_request_information(
            request_configuration
        )
        from .......models.o_data_errors.o_data_error import ODataError

        error_mapping: dict[str, type[ParsableFactory]] = {
            "XXX": ODataError,
        }
        if not self.request_adapter:
            raise Exception("Http core is null") 
        from .......models.activity_history_item import ActivityHistoryItem

        return await self.request_adapter.send_async(request_info, ActivityHistoryItem, error_mapping)

        Optional. NavigationProperty/Containment; navigation property to the activity's historyItems.
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[ActivityHistoryItem]
        
msgraph/generated/users/item/activities/item/history_items/item/activity_history_item_item_request_builder.py