Enable TLSv1.3 At HTTP Proxy
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Introduction
This document describes how the enable TLSv1.3 at HTTP Proxy. The method to be disclosed in this document will be applicable at 3.2.0 and ongoing releases.
How It Works
With the configuration to be made on the HTTP Proxy service file, TLS versions to be supported on the proxy can be determined.
How to Enable It
The first service file path of HTTP Proxy is determined. It is */usr/lib/systemd/system/pam-http.service *at current 3.2.0 release but it can be found with Sudo systemctl status pam-http

Then http.service file should be edited with
-Djdk.tls.client.protocols=<desired TLS versions>

After editing and saving the service file changes will be applied with the below commands.
sudo systemctl daemon-reload
sudo systemctl restart pam-http