Keep getting the same error code (bad request) when trying to retrieve a page using sockets

I was trying to get a web page using Socket and get request but I keep getting the same error - bad request, for any website or webpage i try to use it.

    Socket s = new Socket("horstmann.com", 80);

    InputStream in = s.getInputStream();
    OutputStream out = s.getOutputStream();

    Scanner reader = new Scanner(in);
    PrintWriter writer = new PrintWriter(out, false);

    String command = "GET / HTTP/1.0\n\n";
    //System.out.print(command);
    writer.print(command);
    writer.flush();

    while (reader.hasNextLine()) {
        System.out.println(reader.nextLine());
    }
    s.close();