title: Log in value from Set-Cookie header in nginx
body: <p>Is it possible to write in nginx access log value of key 'uuid' from Cookie for server response (header: Set-Cookie)?</p>
  
  <p>$cookie_uuid - return uuid that sent client
  $sent_http_set_cookie - return whole header Set-Cookie: 'uuid=897587e7-a733-422f-9daa-b3105a5895aa; domain=domain.com; path=/; expires=Tue, 09-Aug-2033 01:17:54 GMT', but I need save only value for key 'uuid'</p>
  
  <p>Thanks</p>