Need example how to change response body

[rik43]

only change body and save headers. i`m try, and this doesnt work.

$response->setBody(Stream::factory('foo'));

this need create new response and copy all headers ?

[xuzhenjun130]

//get body
$content = (string)$response->getBody()
  //change response body 
  $body = Utils::streamFor(json_encode($content));
  $response = $response->withBody($body);