REST API GuideitemsCheck if item existsCheck if item exists HEAD /items/:ID Check if an item with ID exists, but do not return its data. Requires inventory permission. Request Responses204304401404500Exists (No Content)Response HeadersETagEntity tag (RFC 7232)Last-ModifiedLast modification date and time (RFC 7231)Not ModifiedUnauthorizedResponse HeadersWWW-AuthenticatePreferred authentication scheme (RFC 7235)Not FoundRuntime Error (Internal Server Error)