套件： libapache2-mod-rpaf (0.6-13)

module for Apache2 which takes the last IP from the 'X-Forwarded-For' header

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.