Trying to figure out how to make calls to json/rest webservices.

Even trying to get the JSON data from this simple example fails: http://rest-service.guides.spring.io/greeting

This is my code:

Get Create (RefClass(cJsonHttpTransfer)) to oJsonHttp
Get HttpGetJson of oJsonHttp "rest-service.guides.spring.io" "greeting" (&bOk) to hoRcvdJson
What am I doing wrong?