Como pegar o retorno de uma chamada HTTP? - XML

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, OleCtrls, SHDocVw, mshtml;

type
  TForm1 = class(TForm)
    WebBrowser1: TWebBrowser;
    Button1: TButton;
    Memo1: TMemo;
    procedure Button1Click(Sender: TObject);
    procedure WebBrowser1DocumentComplete(Sender: TObject;
      const pDisp: IDispatch; var URL: OleVariant);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  WebBrowser1.Navigate(´https://myaccount.12voip.com/clx/sendsms.php?username=janbaceiredo&password=280000&from=551897950649&to=551897950649&text=xxxxxxxxxx´);
end;

procedure TForm1.WebBrowser1DocumentComplete(Sender: TObject;
  const pDisp: IDispatch; var URL: OleVariant);
var
  sHTML : IHTMLElement;
  Teste: String;
begin
     sHTML:= (WebBrowser1.Document AS IHTMLDocument2).body;

     while sHTML.parentElement <> nil do
     begin
       sHTML := sHTML.parentElement;
     end;
     Teste:= UpperCase(sHTML.outerHTML);
     Memo1.Text:= Teste;
end;

end.

https://myaccount.12voip.com/clx/sendsms.php?username=xxxxxxxxxx&password=xxxxxxxxxx&from=xxxxxxxxxx&to=xxxxxxxxxx&text=xxxxxxxxxx

procedure TForm1.Button1Click(Sender: TObject);
var
  Html: TStringList;
  Urls: String;
begin
  try
    Urls := ´https://myaccount.12voip.com/clx/sendsms.php?username=xxxxxxxxxx&password=xxxxxxxxxx&from=xxxxxxxxxx&to=xxxxxxxxxx&text=xxxxxxxxxx´;
    //Urls := ´http://www.microsoft.com´;

    IdHTTP1.IOHandler := IdSSLIOHandlerSocketOpenSSL1;

    Html := TStringList.Create;
    Html.Text := IdHTTP1.Get(Urls);
    Memo1.Text := Html.Text;
    Html.Free;
  except
    on E: Exception do
      Memo1.Text := E.Message;
  end;
end;

IdHTTP1.IOHandler := IdSSLIOHandlerSocketOpenSSL1;