/**
* Prepare the response to ready to send to client.
*/
public function prepare()
{
if (!$this->prepared) {
$this->content = is_string($this->data) ? $this->data : Json::encode($this->data);
if ($this->data !== null && !is_string($this->data) && !$this->headers->has('Content-Type')) {
$this->headers->set('Content-Type', 'application/json');
}
$this->prepared = true;
}
}
