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In my js file i have this ajax request :

var url = $(this).closest("form").attr('action');
                jQuery.ajax({
                    type: "POST",
                    url: url,
                     data: {
                    "key": "test1",
                    "key2": "test2"
                },
                dataType: 'json'
                }).done(function (msg) {
                    //alert("success");
                });

In my controller i have this code:

 public function execute()
    {

         $response = [
            'errors' => false,
            'message' => 'Re-calculate successful.'
        ];
        $returnValue = '2';
        $result = $this->resultJsonFactory->create();
        $escaper = $this->_objectManager->get('Magento\Framework\Escaper');

        $id= $this->getRequest()->getPost('key2');

        if ($this->getRequest()->isAjax()) {
            $returnValue = 'OK';


        }

        return $result->setData($returnValue);
    }   

When i make the ajax request i receive 2 which came from here $returnValue = '2';

But if i tired to get the $id= $this->getRequest()->getPost('key2'); i receive null.

so my problem is here:

if ($this->getRequest()->isAjax()) {
   $returnValue = 'OK';     
 }

My if is not accessed.

Does anyone know what i am doing wrong?

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