I am using a gallery on my website that gets list of images from a JSON sent by a php script. So, the javascript gallery calls PHP backend and it replies with complex JSON where images are specified as object fields. These fields not necessarily include full URLs, merely a path to needed images. I'd like to use Cloudflare and want these images to be cached there. How I could learn whether these are cached or not, and make sure that these would be cached and not considered some sort of dynamic content?