Method Not Allowed (#405) Method Not Allowed. This url can only handle the following request methods

在使用Yii时候出现如下情况，
在模板页面使用<a href="<?= Url::toRoute('site/logout');?>">退出后台</a>
解析后网页生成的代码的URL地址是 localhost/yii2/backend/index.php?r=site/logout,地址是对的，访问的时候出现如下：
Method Not Allowed (#405) Method Not Allowed. This url can only handle the following request methods: POST. The above error occurred while the Web server was processing your request. Please contact us if you think this is a server error. Thank you.

请问为啥会出现405？哪里配置错了？配置文件里面没有配置路由
通过firebug发现前台的是可以的，而且是POST提交。而通过url生成的访问就不对了？求助

已采纳

肯定是配置site/logout这个action的verbs了，提示很明显，这个action只接受通过POST发送的请求！
所以你检查下siteController 下的behaviors 是不是配置了

'verb' => [    'class' => VerbFilter::className(),    'actions' => [        'logout' => ['post'],    ],],

如果允许GET访问的话，那么可以改成：

'verb' => [    'class' => VerbFilter::className(),    'actions' => [        'logout' => ['get'], //当然可以是是 ['get', 'post']，同时支持POST和GET两种方式访问    ],],或者<form action="?r=site/logout" method="post">        <input type="hidden" name="_csrf-frontend" value="<?php echo yii::$app->request->csrfToken?>">                            <input type="submit" value="退出">                        </form>