Question Sending POST requests from Progress 4gl

We want to create an application that generates an xml file and sends it to an outside webservice through a POST request. The xml generation already done, but I don't know how to do the POST request. Can someone tell me what is the simplest and most straightforward way to do this directly from 4gl? Is it even possible, or do I have to do it with an outside program (like Python)?

Thanks in advance.