When a feature is requested from HttpContext and can't be found, it automatically falls back to get the feature from the connection.

I wonder if the same thing should happen with multiplexed QUIC streams. For example, IConnectionHeartbeatFeature, IConnectionCompleteFeature, IConnectionLifetimeNotificationFeature are set on the QUIC connection. But the transport context for a request is a stream. Those features aren't present.

A fix could be to have an extra level of fallback with IFeatureCollection.Get for multiplexed connections like QUIC:

• Sockets: HttpProtocol -> SocketConnection
• QUIC: HttpProtocol -> QuicStreamContext -> QuicConnectionContext