HTTP authentication via reverse proxy

Hi,
I've taken a dig around the interface for the 4.0.4 web proxy and in the documentation but haven't come up with much so far.
What I want to do is configure a reverse proxy so that it feeds the HTTP authentication credentials into the server when we reverse from the proxy to it.
i.e.
user --> revproxy --> (http_details) --> webserver
The user wont enter these, they'll be somehow if possible, be configured into the reverse proxy so it knows what HTTP realm string to match to a target host and feed the credentials into it.
Is this possible?

Since it is just a matter of adding Authorization header, it is possible.
look around for other discussions for adding headers.

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