Delphi Seattle DataSnap客户端 - 代理服务器设置不起作用

I'm connecting to a DataSnap server using a generated DS client proxy class, via TDSRESTConnection. The connection works fine and I can call the server methods. I now want to connect through a proxy server, so I am setting the properties on the TDSRESTConnection object, but I can see that nothing is being sent via the proxy server, as if the properties are being ignored. My code is as follows :I'm connecting to a DataSnap server using a gen