Need help with "Accept: application/vnd.twitchtv.v5+json"

API
2 
curl_setopt_array($curl, array(
CURLOPT_HTTPHEADER => array(
   'Client-ID: ' . $clientId,
   'Accept: application/vnd.twitchtv.v5+json'
),

It’s a header so should be sent as a header like you do with the clientID