Early Hints
Load transparent image
https://httphive.com/103.png
Load framed image
https://httphive.com/framed/103.png
Load json
https://httphive.com/103.json
This status code is primarily intended to be used with the Link header, letting the user agent start preloading resources while the server prepares a response or preconnect to an origin from which the page will need resources.