how i can make a getrequest with a array like:
http://localhost:201/api/boards/1**?userIds=1&userIds=2&userIds=3**
[HttpGet, Route('/boards/{boardId}')]
function GetContent([FromPath] boardId: Integer; [XDefault('')] searchText: string; [XDefault(0)] StartDate: TDate=0;[XDefault(0)] EndDate: TDate=0; [XDefault('')] UserIds: string = '' ): TStream;
Unfortunately that is not supported, arrays are not supported as query params.
You can simply accept a string with users ids separate by comma and parse it in your service operation to extract the user ids.
To be honest, as a user of the API I would find it easier to send the ids as command-separated string than having to type all parameter names one by one.