http-send-name-header for response?

[Mark Staudinger]

Hi Folks,

Given a setup where I have a backend like so:
backend production
        balance roundrobin
        hash-type consistent
        http-check expect status 200
        option httpchk GET /\ HTTP/1.1\r\nHost:\  
myhost.net\r\nUser-agent:\ healthcheck\r\nConnection:\ close
        server prod_1   192.168.1.10:80 weight 50 maxconn 150 check inter 1m
        server prod_2   192.168.1.20:80 weight 50 maxconn 150 check inter 1m
        server prod_3   192.168.1.30:80 weight 50 maxconn 150 check inter 1m

I'd like to report which of the servers handled this particular request,  
by way of HTTP response header.  For a variety of reasons, this isn't best  
done by the backend servers themselves.

I was eager to try this:

        http-send-name-header Origin-Server

but it appears this sends the name to the backend as a request header.  Is  
there a similar feature that will do this with a response header, or some  
combination of http-response set-header that will perform the equivalent?   
I'm looking to return (to the frontend and then on the client) something  
like

Origin-Server: prod_2

Best Regards,
Mark Staudinger