With TCP pass-through, you’d get the forwarded packets delivered to your app. You’d need to use the proxy_proto handler to get the client IPs.
TCP Pass Through
If you don’t specify handlers, we just forward TCP to your application as is. This is useful if you want to handle TLS termination yourself, for example.
(in this context as-is means “from fly-proxy”).
what’s your use-case for terminating TLS without the proxy_proto hander? You might find this thread useful if you need more information about our internal network.