That's a good one, but it wasn't that. It's something that literally gets clients to add an HTTP header to specify that bandwidth should be "saved". Actually,

That's a good one, but it wasn't that. It's something that literally gets clients to add an HTTP header to specify that bandwidth should be "saved". Actually, that reminded me of what it was called.. haha, it's https://developers.google.com/web/updates/2016/02/save-data?hl=en https://developers.google.com/web/updates/2016/02/save-data?... .. The header is: Save-Data: on.