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@ppk It’s a header too (
{Sec-CH-}Save-Data
: wicg.github.io/savedata/#sec-ch-save-data-request-header-field, developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Save-Data). I’ve mixed feelings when it comes to intermediate (proxy) servers setting it on my behalf. Zero-rate networks (StreamOn in 🇩🇪) effectively do, by forcing free YouTube traffic to low-res.