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vendor/yiisoft/yii2/web/HeadersAlreadySentException.php

@@ -0,0 +1,29 @@
+<?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\Exception;
+
+/**
+ * HeadersAlreadySentException represents an exception caused by
+ * any headers that were already sent before web response was sent.
+ *
+ * @author Dmitry Dorogin <dmirogin@ya.ru>
+ * @since 2.0.14
+ */
+class HeadersAlreadySentException extends Exception
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function __construct($file, $line)
+    {
+        $message = YII_DEBUG ? "Headers already sent in {$file} on line {$line}." : 'Headers already sent.';
+        parent::__construct($message);
+    }
+}