Vk API Авторизация через ПРОКСИ

unit Unit1;
interface
uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, httpsend, ssl_openssl, lib, Vcl.StdCtrls,
  Vcl.ExtCtrls, Vcl.Menus,Vcl.Imaging.pngimage,ShellAPI, Vcl.OleCtrls,DateUtils,
  SHDocVw, IdBaseComponent, IdComponent, IdTCPConnection, IdTCPClient, IdHTTP,
  IdIOHandler, IdIOHandlerSocket, IdIOHandlerStack, IdSSL, IdSSLOpenSSL,
  IdCookieManager, Vcl.ComCtrls;
type
  TForm1 = class(TForm)
    Button1: TButton;
    Memo3: TMemo;
    IdHTTP1: TIdHTTP;
    IdCookieManager1: TIdCookieManager;
    IdSSLIOHandlerSocketOpenSSL1: TIdSSLIOHandlerSocketOpenSSL;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
var
  Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
var
 proxy,response,email,pass,zapros:string;
begin
email:='89681238123';
pass:='123456789';
  proxy:='145.239.4.43:8080';
  IdHTTP1.ProxyParams.ProxyPort:=strtoint(Copy(proxy,pos(':',proxy)+1,maxint));
  IdHTTP1.ProxyParams.ProxyServer:=Copy(proxy,0,pos(':',proxy)-1);
  Memo3.Lines.Add('[ '+proxy+' ]');
 zapros:='https://oauth.vk.com/token?grant_type=password&client_id=2274003&client_secret=hHbZxrka2uZ6jB1inYsH&username='+email+'&password='+pass+'&captcha_key=&captcha_sid=';
response:=idhttp1.get(zapros);
Memo3.Lines.Add(response);
end;
end.