I've been working on getting the various consumers of Google Quiche to report ECN feedback in QUIC ACK frames. Here is an update.
*google.com <http://google.com> and youtube.com <http://youtube.com>*: This remains on by default. Please let me know of any clients that are sending ECT marks for QUIC to Google, not receiving ECN feedback, and are reasonably certain that the codepoints are not being bleached by the network. *Envoy*: As of today, Envoy tip-of-tree should report ECN feedback by default, unless it is running on Windows (CI support for Envoy on Windows is weak, so we are unlikely to implement this). *Chromium:* Implemented, but off by default. A recent Chrome Dev release (126.0.6439.0) can enable it by adding --enable-features=ReceiveEcn to the command line. We will begin what is expected to be a slow rollout to the Chrome fleet in the next few days, but the intended end state is that Chromium enables this by default and the feature flag is deprecated. Martin
