Quinn only provides a QUIC protocol implementation. As far as I know, WebTransport layers on top of HTTP/3, which in turn layers on top of QUIC. The hyper project is in the process of building a h3 crate with a h3-quinn adapter that supports running HTTP/3 over Quinn. Quinn does not provide support for HTTP/3 or WebTransport directly.
Quinn only provides a QUIC protocol implementation. As far as I know, WebTransport layers on top of HTTP/3, which in turn layers on top of QUIC. The hyper project is in the process of building a h3 crate with a h3-quinn adapter that supports running HTTP/3 over Quinn. Quinn does not provide support for HTTP/3 or WebTransport directly.