REMOTE_HOST Last proxy address
REMOTE_ADDR Last proxy IP address
HTTP_FROM Client address
HTTP_FORWARDED by Proxy_URL:port (proxy type) for Client_address
HTTP_X_FORWARDED_FOR Client_IP, Proxy1_IP, ...
HTTP_VIA Proxy1_address:port (proxy1 type), Proxy2_address:port (proxy2 type), ...
Proxy_address:port (proxy type) for Client_address
HTTP_USER_AGENT can bre added "via proxy_characteristic"
HTTP_PROXY_CONNECTION like HTTP_CONNECTION
HTTP_CACHE_CONTROL "Max-age=259200"
HTTP_PRAGMA "no-cache"
Hope it helps
fLIPIS