Is it possible to disable Tls1.3 on free zones?

[alexander33]

What is the name of the domain?

Alexander Efremov

What is the issue you’re encountering

Unable to disable TLS 1.3

What steps have you taken to resolve the issue?

In the “SSL/TLS > Edge Certificates” section I have TLS 1.3 disabled for my zone.
TLS 1.3
Enable the latest version of the TLS protocol for improved security and performance - OFF

However by submitting the request https://zone_name/cdn-cgi/trace I get the following

uag=Mozilla/5.0 (X11; Linux x86_64; rv:136.0) Gecko/20100101 Firefox/136.0
colo=CDG
sliver=none
http=http/3
loc=FR
tls=TLSv1.3
sni=plaintext
warp=off
gateway=off

So It is unclear for me how to disable Tls1.3 on my free zone.
Probably Tls1.3 is always activated on free zones regardless of my configuration in the Edge Certificates section.

[Laudian]

@alexander33

http=http/3

HTTP3 only works with TLSv1.3. The switch disables TLS 1.3 for HTTP 1&2.

[alexander33]

Yes. Tls1.3 disappears if I set http3 to OFF,

Speed > Optimization > HTTP/3 (with QUIC) - OFF

The page looks as expected:
uag=Mozilla/5.0 (X11; Linux x86_64; rv:136.0) Gecko/20100101 Firefox/136.0
colo=CDG
sliver=010-tier1
http=http/2
loc=FR
tls=TLSv1.2
sni=plaintext
warp=off
gateway=off

Thank you.