FileStream := TFileStream.Create('C:\Wetter.html', fmCreate);
      try
        HTTP.Get('http://wetter.rtl.de/static/index_ok.php', FileStream);
      finally
        FileStream.Free;
      end;

 //Code auslesen:
function WB_SaveHTMLCode(WebBrowser: TWebBrowser; const FileName: TFileName): Boolean;
var
  ps: IPersistStreamInit;
  fs: TFileStream;
  sa: IStream;
begin
  ps := WebBrowser.Document as IPersistStreamInit;
  fs := TFileStream.Create(FileName, fmCreate);
  try
    sa := TStreamAdapter.Create(fs, soReference) as IStream;
    Result := Succeeded(ps.Save(sa, True));
  finally
    fs.Free;
  end;
end;

Temp := HTTP.Get('http://wetter.rtl.de/static/index_ok.php');

      Temp := Copy(Temp, Pos('<td valign="top" width="435" colspan="3"> ', Temp),
                Pos(' </td>', Temp));

Function GetHTML(AUrl: string): string;
var
  databuffer : array[0..4095] of char;
  ResStr : string;
  hSession, hfile, hRequest: hInternet;
  dwindex,dwcodelen,datalen,dwread,dwNumber: cardinal;
  dwcode : array[1..20] of char;
  res : pchar;
  Str : pchar;
begin
  ResStr:='';
  if pos('http://',lowercase(AUrl))=0 then
     AUrl:='http://'+AUrl;
  hSession:=InternetOpen('InetURL:/1.0',
                         INTERNET_OPEN_TYPE_PRECONFIG,
                         nil,
                         nil,
                         0);
  if assigned(hsession) then
  begin
    hfile:=InternetOpenUrl(
           hsession,
           pchar(AUrl),
           nil,
           0,
           INTERNET_FLAG_RELOAD,
           0);
    dwIndex := 0;
    dwCodeLen := 10;
    HttpQueryInfo(hfile,
                  HTTP_QUERY_STATUS_CODE,
                  @dwcode,
                  dwcodeLen,
                  dwIndex);
    res := pchar(@dwcode);
    dwNumber := sizeof(databuffer)-1;
    if (res ='200') or (res ='302') then
    begin
      while (InternetReadfile(hfile,
                              @databuffer,
                              dwNumber,
                              DwRead)) do
      begin
        if dwRead =0 then
          break;
        databuffer[dwread]:=#0;
        Str := pchar(@databuffer);
        resStr := resStr + Str;
      end;
    end
    else
      ResStr := 'Status:'+res;
    if assigned(hfile) then
      InternetCloseHandle(hfile);
  end;
  InternetCloseHandle(hsession);
  Result := resStr;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Memo1.Text := GetHTML('http://wetter.rtl.de/static/index_ok.php');
end;