Why this json Symfony output outputs the headers

问题

This is my first day to have fun with Symfony and drupal 8, so please excuse me if my question is very obvious.

With drupal 7:

drupal_json_output(array('products' => array_values($products)));
exit; 

the json output is clean:

{"products":["item_1","item_2",....]}

With drupal 8:

use Symfony\Component\HttpFoundation\JsonResponse; 
// some process
print new JsonResponse(array('products' => array_values($products)));
exit;

It outputs with the headers:

HTTP/1.0 200 OK
Cache-Control: no-cache
Content-Type:  application/json
Date:          Wed, 18 Jul 2012 07:53:26 GMT

{"products":["item_1","item_2",....]}

How do you get rid of those headers?

I am stuck to read the reference here.

Any hint is very much appreciated.

回答1:

You can get only the "content" of a response by calling $response->getContent().

In your case you could do

use Symfony\Component\HttpFoundation\JsonResponse; 
// some process
$response = new JsonResponse(array('products' => array_values($products)));
print $response->getContent();
exit;

However, be aware that this would be a bad practice because you would lose the response headers in the process, and wouldn't tell for example, what the content-type of you response is (in this case: "application/json") etc ...

I do not know how to do this properly with drupal, any tips is appreciated.

来源：https://stackoverflow.com/questions/11536952/why-this-json-symfony-output-outputs-the-headers