Redirect URL to different hostname after SSL offloading

Backend servers (node servers) are configured to use the Cnames (myacceslist.intranet) to communicate internally between the servers.

Ahhhh. I think I finally see what you're saying. And actually it's a fairly common misconception that an HTTP redirect is used to change the host name for backend servers. An HTTP redirect is a flow control command. When this command is triggered it will preempt traffic from and respond directly to the client. No traffic will flow to the servers. What you need in this case is to simply change the Host header with the "HTTP::host"

when HTTP_REQUEST {
    HTTP::host "myacceslist.intranet"
}

This will rewrite the Host header field as the HTTP request flows through the proxy to the servers.