yii2 post failed (400 error) solution

yii2 post400 error solution:

The first solution is to turn off Csrf

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

The second solution is to add it to the form Hidden domain

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

The third solution is to add the _csrf field in 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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