valid-for-minute:
  body: This response will stay fresh for one minute
  headers:
    cache-control: max-age=60
    custom-header: any value
private:
  body: This is a private response, it will not be cached by Envoy
  headers:
    cache-control: private
no-cache:
  body: This response can be cached, but it has to be validated on each request
  headers:
    cache-control: max-age=0, no-cache