Q:

'Bad Request' with ajax and codeigniter

Windows 10, Codeigniter 3, Wamp3. 
Ajax post throws a Bad Request error.  This is an old chestnut but online research shows the problem usually to be CSRF.  However I emphasize at the outset that I have csrf disabled for this test:
config['csrf_protection'] = FALSE;

I have set up some deliberately very simple test code.  The controller looks like this:
class Ajax extends CI_Controller {

public function index() {

$this->load->view('pages/index');
}

public function hello($name) {
    $fullname = $this->input->post('fullname');
    echo 'Hello '.$fullname;

}

}//EOF

and the view looks like this:
<! doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Demo Ajax</title>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script>
    $(function() {
        $('#bttHello').click(function(){
            var fullname = $('#fullname').val();
            $.ajax({
                type:'POST',
                data: {fullname: fullname},
                url:'<?php echo base_url('ajax/hello'); ? > + fullname',
                success: function(result) {
                    $('#result1').html(result);

                }
            });

        });

    });
</script>
</head>
<body>

Name <input type="text" id="fullname">
<input type="button" value="Hello" id="bttHello">
<br>
<span id="result1"></span>

</body>
</html>

The console shows a Bad Request
POST XHR http://localhost/faith/ajax/hello%20+%20fullname [HTTP/1.1 400 Bad Request 9ms]

So if csrf is not the culprit, is it a Wamp issue?  Everything else seems to work fine.  I have spent so much time on this! 
What is going on?  

A:

Data are already sent through POST.  No need to pass it through URL
<script>
$(function() {
  $('#bttHello').click(function(){
    var fullname = $('#fullname').val();
    $.ajax({
      type:'POST',
      data: {fullname: fullname},
      url:"<?php echo base_url('ajax/hello'); ? >",
      success: function(result) {
        $('#result1').html(result);
      }
    });
  });
});
</script>

And, remove parameter $name from controller action hello(). 
public function hello() {
  $fullname = $this->input->post('fullname');
  echo 'Hello '.$fullname;
}

