What version of Go are you using (go version)?

$ go version
1.19

Does this issue reproduce with the latest release?

No

What operating system and processor architecture are you using (go env)?

$ go env

What did you do?

I run HTTP2 spec test and there are four tests that cannot be passed.
spec test repo: https://github.com/summerwind/h2spec
command: ./h2spec -p 8888 -k -t -v http2

What did you expect to see?

all the tests passed

What did you see instead?

test code:

func main() {
	server := &http.Server{
		Addr:         ":8888",
		ReadTimeout:  5 * time.Second,
		WriteTimeout: 10 * time.Second,
	}

	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte(fmt.Sprintf("Protocol: %s", r.Proto)))
	})

	if err := server.ListenAndServeTLS("./examples/tls/server.crt", "./examples/tls/server.key"); err != nil {
		log.Fatal(err)
	}
}