When setting up a TWebClientConnection for use with a TWebClientDataSet, the Command property is ignored.
This makes it impossible to retrieve data from endpoints which require POST (e.g. additional request Parameters are needed ).
This happens in
core source/WEBlib.CDS (TWebClientDataProxy.DoGetData)
1280: R.FXHR.open('GET', URL, true);
Also, TWebClientConnection.SetupRequest isn't prepared to add content from Postdata..