Apache+mod_rpaf+nginx — пропал хедер.

        server {
                listen 80;
                server_name serv;
                location / {
                        proxy_pass http://127.0.0.1:8080;
                        proxy_set_header  X-Real-IP $remote_addr;
                        proxy_set_header  Host $http_host;
                        proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
                }

        LogFormat "%h %l %u %t \"%r\" %>s %b \"%{X-Real-IP}i\" \"${X-Forwarded-For}i\" \"%{Referer}i\" \"%{User-agent}i\"" combined
        CustomLog /var/log/apache2/serv/access_log combined

# tail -n1 /var/log/apache2/serv/access_log
93.186.222.15 - - [31/Aug/2011:06:09:46 +0400] "GET /section8/index.php HTTP/1.0" 200 1879 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:5.0) Gecko/20100101 Firefox/5.0"