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+rpaf changes the remote address of the client on incoming proxy
+requests. It is used in backend servers that needs to know the IP of the
+client, and works in conjunction with mod_proxy_add_forward (which sets
+the X-Forwarded-For header). When an X-Host header exists rpaf will take
+the hostname found here, put it into Apache, and update the virtualhost
+settings so that you can serve virtualhosts on the backend.
+
+WWW: http://stderr.net/apache/rpaf/