Solution to 400 error in yii2

400 error solution in yii2:

The first solution is to close Csrf

Close it in the controller

public function init(){  
  $this->enableCsrfValidation = false;
}

The second solution is to add a hidden field to the form

<input name="_csrf" type="hidden" id="_csrf" value="<?= Yii::$app->request->csrfToken ?>">

The third solution is to add the _csrf field to AJAX

var csrfToken = $('meta[name="csrf-token"]').attr("content");
$.ajax({
  type: 'POST',
  url: url,
  data: {_csrf:csrfToken},
  success: success,
  dataType: dataType
});

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