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procedure TForm1.Button1Click(Sender: TObject);
var idhttp1 : TIdHTTP;
    host,path : String;
    code : integer;

begin
idhttp1 := TIdHTTP.Create;
host := Edit1.Text;
path := Edit2.Text;
//idhttp1.head(host+path);
//code := idhttp1.Responsecode;
try
idhttp1.ConnectTimeout:=1;
showmessage(inttostr(isHTTPSourceThere(host+path))) ;
except
 on EIdHTTPProtocolException do begin
  showmessage('geht nich');
  end;
  end;

end;

function TForm1.isHTTPSourceThere(const AURL: String): Integer;
var
  idhttp1:TIDhttp;
begin
  idhttp1 := Tidhttp.Create(nil);
  with IdHTTP1 do
  begin
    try
      Response.Clear;
      HEAD(AURL);
    except
    end;
    Result := IdHTTP1.ResponseCode;
  end;
  idhttp1.Free;
end;