Get Selected backend info

[Aleem B]

Hello,

I couldn't find much information other than this thread
<http://mailman.nginx.org/pipermail/nginx/2008-February/003550.html> which
is a dead-end.

I would like to add the selected backend/upstream to an "X-Backend" header
before dispatching the request to the backend.

In Varnish I can do this via:
set req.http.X-Backend = req.backend

In HAProxy I can do this via:
http-send-name-header X-Backend

However, I am stumped with Nginx. I imagine I could work around it by
redirecting to the same server or some other trickery (not sure if that's a
reasonable approach--what would the config look like in any case here?).

Any other tips or suggestion are welcome.

Thanks,
Aleem
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