TCP only proxy changes https to http

I have a very simple tcp proxy where the backend is serving SSL encrypted content.

My understanding is that in the config below there is no manipulation of the content passing through; however, some redirects are changing from https to http. If the same request is made while bypassing HAproxy the protocol does not change.

        log     global
        mode    tcp
        option  tcplog
        option  dontlognull
        timeout connect 5000
        timeout client  50000
        timeout server  50000

frontend tcp-fe
       bind :443
        mode tcp
        option  tcplog
        default_backend ingress

backend ingress
        mode tcp
        server ingress check