With a GET command, you usually don't pass it any data since it is just GETting something. Passing data to the API usually uses a POST or PUT.
This simple call works for me:
CALL "*plus/web/request","https://cataas.com/api/count",$$,recvdata$
PRINT RECVDATA$
{"count":1987}
This simple call works for me:
CALL "*plus/web/request","https://cataas.com/api/count",$$,recvdata$
PRINT RECVDATA$
{"count":1987}