How to send file data as a post parameter in a BuzzBrowser mail call

Question

I use Buzz Browser to call a method POST. I get the file from the client in one of end point.

$fileObj = $requestObject->files->get('image_data');

This is correct fileObject. I checked this with a method is_file().

Now I need to fire the Buzz Browserpost event using this file as a parameter.

$headers = array('Content-Type'=>'multipart/form-data'); 
$url = $genericHost . $api; //A valid URL
$params = array('image_data' => $fileObj);//fileObj obtained above

Publishing this information with buzzBrowser

$browser->post($url, $headers, $params);

And getting it like -

$fileObj = $this->get('request')->files->get('image_data');

But the final one $fileObjis NULL.

I tried to reset $this->get('request')->files-

object(Symfony\Component\HttpFoundation\FileBag)#11 (1) {
["parameters":protected]=>
     array(0) {
    }
}

So the file is missing. What is wrong with my approach?

Edit: 1

After debugging more, I found that the object file is sent as normal parameters:

["request"]=>
  object(Symfony\Component\HttpFoundation\ParameterBag)#7 (1) {
    ["parameters":protected]=>
    array(1) {
      ["image_data"]=>
      string(14) "/tmp/php6QLezs"
    }
  }

Request Header:

["headers"]=>
   object(Symfony\Component\HttpFoundation\HeaderBag)#13 (2) {
    ["headers":protected]=>
    array(7) {
      ["content-type"]=>
      array(1) {
        [0]=>
        string(70) "multipart/form-data; boundary=----------------------------1b3e33ff2ecb"
      }
      ["content-length"]=>
      array(1) {
        [0]=>
        string(3) "159"
       }
      ["host"]=>
      array(1) {
        [0]=>
        string(16) "host_name"
      }
      ["accept"]=>
        array(1) {
       [0]=>
       string(3) "*/*"
     }
     ["x-php-ob-level"]=>
      array(1) {
       [0]=>
       int(1)
     }
    }

Answer 1

, Buzz Browser's .

use Buzz\Message\Form\FormRequest;
use Buzz\Message\Form\FormUpload; 

$request = new FormRequest();
$request->setField('image_data', new FormUpload($imageFilePath));
$request->setHeaders($headers);
$request->setMethod($method);
$request->setHost($genericHost);
$request->setResource($api);
$response= $this->browser->send($request, null);

post of Buzz Browser