Microsoft.Extensions.Primitives that I'm referencing. (Kestrel also leans heavily on the built-in DI which I don't want to use.)HttpListener, which is missing only a few features I'd like such as a RequestAborted cancellation token when a request is received, and some poor async APIs (e.g. no CancellationToken parameter). However, I was reading recently about HTTP/3 and would like to support that (don't need to worry about prior HTTP versions if I can support HTTP/3). I don't know how I can do that from HttpListener.