Errors in codeigniter-restserver library

Thanks!
I moved files to  "application/libraries/" (not inside of any subdirectory) and it works, but I want to make some tests.
I copied methods users_post and users_get to my control :

Code:

<?php
require_once("application/libraries/REST_Controller.php");
class Users extends REST_Controller
{

   function __construct()
   {
       // Construct the parent class
       parent::__construct();

       // Configure limits on our controller methods
       // Ensure you have created the 'limits' table and enabled 'limits' within application/config/rest.php
       $this->methods['user_get']['limit'] = 500; // 500 requests per hour per user/key
       $this->methods['user_post']['limit'] = 100; // 100 requests per hour per user/key
       $this->methods['user_delete']['limit'] = 50; // 50 requests per hour per user/key
   }

   public function users_get()
   {
       // Users from a data store e.g. database
       $users = [
           ['id' => 1, 'name' => 'John', 'email' => '[email protected]', 'fact' => 'Loves coding'],
           ['id' => 2, 'name' => 'Jim', 'email' => '[email protected]', 'fact' => 'Developed on CodeIgniter'],
           ['id' => 3, 'name' => 'Jane', 'email' => '[email protected]', 'fact' => 'Lives in the USA', ['hobbies' => ['guitar', 'cycling']]],
       ];

       $id = $this->get('id');

       // If the id parameter doesn't exist return all the users

       if ($id === NULL)
       {
           // Check if the users data store contains users (in case the database result returns NULL)
           if ($users)
           {
               // Set the response and exit
               $this->response($users, REST_Controller::HTTP_OK); // OK (200) being the HTTP response code
           }
           else
           {
               // Set the response and exit
               $this->response([
                   'status' => FALSE,
                   'message' => 'No users were found'
               ], REST_Controller::HTTP_NOT_FOUND); // NOT_FOUND (404) being the HTTP response code
           }
       }

       // Find and return a single record for a particular user.

       $id = (int) $id;

       // Validate the id.
       if ($id <= 0)
       {
           // Invalid id, set the response and exit.
           $this->response(NULL, REST_Controller::HTTP_BAD_REQUEST); // BAD_REQUEST (400) being the HTTP response code
       }

       // Get the user from the array, using the id as key for retreival.
       // Usually a model is to be used for this.

       $user = NULL;

       if (!empty($users))
       {
           foreach ($users as $key => $value)
           {
               if (isset($value['id']) && $value['id'] === $id)
               {
                   $user = $value;
               }
           }
       }

       if (!empty($user))
       {
           $this->set_response($user, REST_Controller::HTTP_OK); // OK (200) being the HTTP response code
       }
       else
       {
           $this->set_response([
               'status' => FALSE,
               'message' => 'User could not be found'
           ], REST_Controller::HTTP_NOT_FOUND); // NOT_FOUND (404) being the HTTP response code
       }
   }

   public function users_post()
   {
       // $this->some_model->update_user( ... );
       $message = [
           'id' => 100, // Automatically generated by the model
           'name' => $this->post('name'),
           'email' => $this->post('email'),
           'message' => 'Added a resource'
       ];

       $this->set_response($message, REST_Controller::HTTP_CREATED); // CREATED (201) being the HTTP response code
   }

But running url "http://local-ci3.com/api/users" in browser I got

Code:

{"status":false,"error":"Unknown method"}

response.  Method users_get was not found! why?

I made JavaScript sample to test POST action :

Code:

function new_user() {
request_url = '{$base_url}api/user'
$("#div_request_url").html("POST : " + request_url);

var user_is_active = ''
if ($("#user_is_active_y").is(':checked')) {
user_is_active = 'Y'
}
if ($("#user_is_active_n").is(':checked')) {
user_is_active = 'N'
}

alert( "new_user  request_url  ::"+var_dump(request_url) ) // shows   http://local-ci3.com/api/user
$.ajax({
url: request_url,
dataType: "json",
type: "POST",
data: {
"name": $("#user_name").val(),
"is_active": user_is_active,
"activation_key": $("#user_activation_key").val(),
"login": $("#user_login").val(),
"password": $("#user_password").val(),
"active_till_date": $("#user_active_till_date").val(),
},
beforeSend: function (xhr) {
//xhr.setRequestHeader("X_REST_USERNAME", "<?php echo Yii::app()->params['RESTusername'] ?>");
//xhr.setRequestHeader("X_REST_PASSWORD", "<?php echo Yii::app()->params['RESTpassword'] ?>");
console.log(xhr);
},
success: function (data, textStatus, XMLHttpRequest) {

But in console of browser I saw :

Code:

POST http://local-ci3.com/api/user 404 (Not Found)

Which is the correct way? Have I to set some changes in application/config/routes.php or .htaccess files?