I notice quic-go http3 package support RFC 9297, but tokio-quiche doesn't mention it, in fact I only found
/// Set the `SETTINGS_ENABLE_CONNECT_PROTOCOL` HTTP/3 setting.
/// See <https://www.rfc-editor.org/rfc/rfc9220#section-3-2>
pub enable_extended_connect: bool,
in Http3Settings, it is not http datagram(RFC 9297)