Yii2: Method Not Allowed (#405) while logout user

Question

I am loging out user through following code. This is my view code behind logout button:

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Answer 1

Seems like you have VerbFilter attached to logout action in your SiteController:

/**
 * @inheritdoc
 */
public function behaviors()
{
    return [            
        'verbs' => [
            'class' => VerbFilter::className(),
            'actions' => [
                'logout' => ['post'],
            ],
        ],
    ];
}

That means this action can requested only with POST method, and you are requesting with GET, that's why exception #405 is thrown.

Either remove this from VerbFilter or add data-method attribute to request with POST:

...

Update: Another reason of this problem can be missing dependency for yii\web\YiiAsset. Make sure it's included in AppAsset:

public $depends = [
    'yii\web\YiiAsset',
    ...
];

YiiAsset provides data-method attribute feature which gives possibility to link act as a form with action post by writing less code. Without asset obviously link will act as regular link and standard GET request will be sent.