Will anything like
[OperationContract] [WebGet] string IWannaRead(int[] ids);
work? And how to form a link\url (www.example.com/service.svc?ids=1,2,3,4,5,6,7,8) for the request?
www.example.com/service.svc?ids=1,2,3,4,5,6,7,8
Yes, you can. It works exactly as you specified.