Envoy 1.22: Configuring HTTP/3 Fallback Policy for Reliable Connections
We want to enable stable HTTP/3 support in Envoy 1.22 for outbound traffic using the h3 cluster type and the enable_http3: true flag. The configuration also requires a QUIC transport socket with the QUIC library compiled in. However, automatic downgrade to HTTP/2 on a QUIC handshake failure is not enabled by default; users must set the fallback_policy explic