Proxy on Centos 7?

Question

VPN

There is a vps server on centos7, vpn is configured on it. It is necessary that by connecting to it via vpn, all http and https traffic goes through a proxy.
Here are the settings from the server:

traceroute performed from the server does not go through a proxy, connecting with a mobile phone to it via vpn, going to the 2ip.ru website, we also see the ip of the server and not the proxy.