yii2-bootstrap/framework/yii/web/HttpException.php

<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\web;

use yii\base\UserException;
use yii\web\Response;

/**
 * HttpException represents an exception caused by an improper request of the end-user.
 *
 * HttpException can be differentiated via its [[statusCode]] property value which
 * keeps a standard HTTP status code (e.g. 404, 500). Error handlers may use this status code
 * to decide how to format the error page.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class HttpException extends UserException
{
	/**
	 * @var integer HTTP status code, such as 403, 404, 500, etc.
	 */
	public $statusCode;

	/**
	 * Constructor.
	 * @param integer $status HTTP status code, such as 404, 500, etc.
	 * @param string $message error message
	 * @param integer $code error code
	 * @param \Exception $previous The previous exception used for the exception chaining.
	 */
	public function __construct($status, $message = null, $code = 0, \Exception $previous = null)
	{
		$this->statusCode = $status;
		parent::__construct($message, $code, $previous);
	}

	/**
	 * @return string the user-friendly name of this exception
	 */
	public function getName()
	{
		if (isset(Response::$httpStatuses[$this->statusCode])) {
			return Response::$httpStatuses[$this->statusCode];
		} else {
			return 'Error';
		}
	}
}