Http-in/2 in log - what does it mean?

While I’m trying to tackle what happens with a not functioning ssl- handshake
on a connection (see other of my posts on this topic -> , which is still unanswered),
I’m wondering what http-in/2means in my haproxy.log.

My guess: second bind address?

frontend http-in
    bind *:80
    bind *:443 ssl crt /etc/haproxy/certs/ strict-sni
    bind quic4@ name quic443 ssl crt /etc/haproxy/certs/ proto quic alpn h3,h3-29,h3-28,h3-27 npn h3,h3-29,h3-28,h3-27 allow-0rtt curves secp521r1:secp384r1