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I am able to configure HAProxy to to present itself as an HTTP/3 server by following instruction here: https://www.haproxy.com/blog/announcing-haproxy-2-6/

bind :443 ssl crt server.pem alpn h2,http/1.1
http-response set-header alt-svc "h3=\":443\";ma=900;"

But what do I need to put in haproxy.cfg to to indicate to HAProxy that the backend server supports HTTP/3 and it should use QUIC protocol to connect to it? I tried the same quic4@ prefix but it didn't seem to do anything.

server s1 quic4@192.168.4.4:443
some user
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    There is nothing about this in haproxy documentation. You probably want to ask this question on https://discourse.haproxy.org/ or on their mailing list https://www.mail-archive.com/haproxy@formilux.org/ – AlexD Dec 09 '22 at 09:10

1 Answers1

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You need this line also to enable quic protocol ;

# enables HTTP/3 over QUIC
bind quic4@:443 ssl crt /etc/haproxy/certs/foo.com/cert.pem alpn h3
Darren T
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