我知道,如果我们谈论非安全连接,可以通过http/2协议建立连接,而不需要ALPN。那TLS连接呢?在中说:
A client MUST send the connection preface (Section 3.5) and then MAY
immediately send HTTP/2 frames to such a server; servers can identify
these connections by the presence of the connection preface. This
only affects the establishm