Example::users_post PHP Method

    public function users_post()
    {
        // $this->some_model->update_user( ... );
        $message = ['id' => 100, '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
    }