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vendor/yiisoft/yii2/rest/OptionsAction.php

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+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\rest;
+
+use Yii;
+
+/**
+ * OptionsAction responds to the OPTIONS request by sending back an `Allow` header.
+ *
+ * For more details and usage information on OptionsAction, see the [guide article on rest controllers](guide:rest-controllers).
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class OptionsAction extends \yii\base\Action
+{
+    /**
+     * @var array the HTTP verbs that are supported by the collection URL
+     */
+    public $collectionOptions = ['GET', 'POST', 'HEAD', 'OPTIONS'];
+    /**
+     * @var array the HTTP verbs that are supported by the resource URL
+     */
+    public $resourceOptions = ['GET', 'PUT', 'PATCH', 'DELETE', 'HEAD', 'OPTIONS'];
+
+
+    /**
+     * Responds to the OPTIONS request.
+     * @param string $id
+     */
+    public function run($id = null)
+    {
+        if (Yii::$app->getRequest()->getMethod() !== 'OPTIONS') {
+            Yii::$app->getResponse()->setStatusCode(405);
+        }
+        $options = $id === null ? $this->collectionOptions : $this->resourceOptions;
+        $headers = Yii::$app->getResponse()->getHeaders();
+        $headers->set('Allow', implode(', ', $options));
+        $headers->set('Access-Control-Allow-Methods', implode(', ', $options));
+    }
+}