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function CheckUrl(url: string): boolean;

var

  hSession, hfile, hRequest: hInternet;

  dwindex, dwcodelen: dword;

  dwcode: array[1..20] of char;

  res: pchar;

begin

  if pos(‘http://‘, lowercase(url)) = 0 then

    url := ‘http://‘ + url;

  Result := false;

  hSession := InternetOpen(‘InetURL:/1.0‘, INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);

  if assigned(hsession) then

  begin

    hfile := InternetOpenUrl(hsession, pchar(url), nil, 0, INTERNET_FLAG_RELOAD, 0);

    dwIndex := 0;

    dwCodeLen := 10;

    HttpQueryInfo(hfile, HTTP_QUERY_STATUS_CODE, @dwcode, dwcodeLen, dwIndex);

    res := pchar(@dwcode);

    result := (res = ‘200‘) or (res = ‘302‘);

    if assigned(hfile) then

      InternetCloseHandle(hfile);

    InternetCloseHandle(hsession);

  end;

end;