$ java src/Discovery.java https://localhost:4433/hello     (server: h1.1 + h2 on TCP, h3 on UDP, Alt-Svc advertised)
ANY              -> HTTP_2 HTTP_3 HTTP_3 HTTP_3
ALT_SVC          -> HTTP_2 HTTP_3 HTTP_3 HTTP_3
HTTP_3_URI_ONLY  -> HTTP_3 HTTP_3 HTTP_3 HTTP_3