libapache-mod-rpaf | module for Apache which takes the last IP from the 'X-Forwarded-For' header | Mehr ...
rpaf is short for reverse proxy add forward. . rpaf is for backend Apache servers what mod_proxy_add_forward is for frontend Apache servers. It does exactly the opposite of mod_proxy_add_forward written by Ask Bjorn Hansen. . It changes the remote address of the client visible to other Apache modules when two conditions are satisfied. First condition is that the remote client is actually a proxy that is defined in httpd.conf. Secondly if there is an incoming X-Forwarded-For header and the proxy is in its list of known proxies it takes the last IP from the incoming X-Forwarded-For header and changes the remote address of the client in the request structure.
