Base URL for an RO Server

You can use OnCustomResponseEvent.
example of using this event is shown in this code snippet

it can be like:

// ROSOAPMessage should be drop to form
// '/v1/soap' string shouldn't be registered in `ROIndyHTTPServer1.Dispatchers`
procedure TMegaDemoServerMainForm.ROIndyHTTPServer1CustomResponseEvent(const aTransport: IROHTTPTransport;
  const aRequestStream, aResponseStream: TStream; const aResponse: IROHTTPResponse; var aHandled: Boolean);
var
  op: TROResponseOptions;
begin
  if AnsiSameText(aTransport.PathInfo,'/v1/soap') then begin
    MainProcessMessage(ROSOAPMessage,atransport,aRequestStream,aResponseStream,op);
    aHandled := True;
  end;
end;