ajax error 400 bad request

Question

I am trying to upload file using ajax in yii2. but it browser console it shows 400 Bad Request in my site_url what is my mistake.. Please help anyone.

var site_url = '<?php echo Url::to (['formdata/movefile','id'=>'']); ?>' + unic ;
                 var file_data = $('#formdata-'+ form + '-' + component + '-c_data').prop('files')[0];
                      var form_data = new FormData();                  
                      form_data.append('file', file_data);

                       $.ajax({
                    url: site_url, // point to server-side PHP script 
                    dataType: 'TEXT',  // what to expect back from the PHP script, if anything
                    cache: false,
                    contentType: false,
                    processData: false,
                    data: { form_data:form_data,_csrf : '<?=Yii::$app->request->getCsrfToken()?>'},                         
                    type: 'POST',
                    success: function(php_script_response){
                       alert(php_script_response);
                    }
         });

Answer 1

I think you need to set contentType to json, as you are sending json data

contentType: "application/json"

So your ajax request will be something like this

$.ajax({ url: site_url, dataType: 'TEXT',  cache: false, contentType: "application/json", processData: false, data: { form_data:form_data,_csrf : '<?=Yii::$app->request->getCsrfToken()?>'}, type: 'POST', success: function(php_script_response){ alert(php_script_response); }

You can also get 400 Bad request error if you are not sending the data to server as described in its documentation. ( usually missing certain parameters or headers )

Answer 2

if you enable enableCsrfValidation in you yii2 project, you need to add a token to ajax data to make the request validate.

@see

CSRF

CSRF Ajax

Answer 3

i found my mistake..

There was csrf token mistake in my controller action.. so i add this following code in controller

public function beforeAction($action)
    {
        if (in_array($action->id, ['movefile'])) {
            $this->enableCsrfValidation = false;
        }
        return parent::beforeAction($action);
    }

Now its working perfectly

Thanks to all :-)))))))