REST controller + angularJS (CodeIgniter)

var userData = {username: $scope.user.Username, password: $scope.user.Password};
				var headers = {'Content-Type': 'application/json'};
				
				$http.put(api_url + 'api/users/login', userData, headers).success(function(data){
					//login
					if(data.error == false)
					{
						$('#invalidData').slideUp();
						$('#noData').slideUp();
						$('#form').slideUp();
						$('#loggedIn').slideDown();
						$('#connectionError').slideUp();
						$('#loginError').slideUp();					
					}
					// the combination does not exist
					else{
						$('#invalidData').slideUp();
						$('#noData').slideUp();
						$('#connectionError').slideUp();
						$('#loginError').slideDown();					
					}
				}).error(function(data){					
					$('#invalidData').slideUp();
					$('#noData').slideUp();
					$('#connectionError').slideDown();
					$('#loginError').slideUp();
				});

// The login function
		public function login_put()
		{
			$this->form_validation->set_data($this->put());
		
			// validate
			if($this->form_validation->run('login_put') == TRUE)
			{
				$test = $this->aauth->login($this->put('username'), $this->put('password'));
				
				//
				// the user cannot be found
				if($test == false)
				{
					$this->response(array('error' => true), 200);
				}else
				{
					$this->response(array('error' => false), 200);
				}
			}else
			{
				$this->response(array('error' => true), 400);
			}
		}