help. I can't get value from ajax

hi. happy new year^^

I need your help....

I can't get value from ajax; how to get values from ajax.

my source is below...

phalcon

<?php

namespace App\Controllers\Test;

class GetController extends ControllerBase{
    private $responseData = "";

    public function initialize(){
        $this->view->disable();
    } 

    public function indexAction(){
        $this->request->isAjax(); // this works. result is 1 in chrome console
        echo 'hi'; // this works. result is hi in chrome console

        print_r($this->request->getJsonRawBody()); // result is blank in chrome console
        print_r($request->getJsonRawBody()); // result is Undefined variable: request in chrome console

        print_r($this->request->getPost()); // result is blank in chrome console
        print_r($request->getPost()); // result is Undefined variable: request in chrome console

        print_r($this->request->getPost('request')); // result is blank
        print_r($request->getPost('request')); // result is Undefined variable: request in chrome console

        print_r($_POST); // result is blank in chrome console

javascript

$.ajax({
            url         : "/test/get",
            method      : "POST",
            processData : false,
            cache       : false,
            data        : {
                            request : "hi1234"
                          }, // xmlDocument
            dataType    : "text",
            success     : function(data){
                console.log(data);
            }
    });