POST url 403 forbidden in Codeigniter 3

hey guys just found the answer. Thank you for all your suggestions and advice.

<script type="text/javascript">function q_header() {  var question = document.getElementById('question').value;  $.ajax({     url: "<?php echo base_url('Mainx/insert_question_header');?>",     type: "post",     data: {'<?php echo $this->security->get_csrf_token_name(); ?>':'<?php echo $this->security->get_csrf_hash(); ?>',"question":question},     success: function(){       alert("success");     },     error:function(){       alert("failure");     }  });}</script>

I try this code and instead using question_header i change it to question. This also work even when you set your $config[csrf_protection]=TRUE; or $config[csrf_generate]=TRUE;this is my updated answer.

As in Docs Try with In your Config file Set

$config['csrf_regenerate'] = FALSE;

Try it with this:

$.ajax({        url : "<?php echo base_url('Mainx/insert_question_header');?>",        crossDomain: true,        contentType: "application/x-www-form-urlencoded",        method: "POST",        data: { name: 'question_header', '<?php echo $this->security->get_csrf_token_name(); ?>' : '<?php echo $this->security->get_csrf_hash(); ?>' },        dataType: 'json',        success: function(data){            //alert('data save');        },        error: function (jqXHR, textStatus, errorThrown){            alert('Error adding');        }    });

So you have to place the CSRF token to the data: section.