Stream ssl_preread: $ssl_preread_protocol variable.
Stream ssl_preread: $ssl_preread_protocol variable.

The variable keeps the latest SSL protocol version supported by the client.
The variable has the same format as $ssl_protocol.

The version is read from the client_version field of ClientHello.  If the
supported_versions extension is present in the ClientHello, then the version
is set to TLSv1.3.

hy0kl/nginx,hy0kl/nginx,hy0kl/nginx