How to filter columns returned under ListItemAllField in REST API

Question

I used below rest API which I can get all items in specific folder inside SharePoint document library /_api/web/getfolderbyserverrelativeurl('serverrelativefolderurl')/files? $expand=ListItemAllFields

I would need to filter some columns which I get under ListItemAllField , I used "_api/web/GetFolderByServerRelativeUrl('serverrelativefolder‌​url')/files?$expand=‌​ListItemAllField$fil‌​ter=ACT eq '23'

"ACT" is columns name which has returned under ListItemAllField , but I get Error message "Field or property \"ACT\" does not exist." , is there any way to filter columns returned under ListItemAllField

Thanks , Laleh

Answer 1

Solution1: Instead of $ use & and try

Solution2: Check the internal name for ACT, if it varies then using internal name and check.