varnish:

varnish - web accelerator    Linux   (FreeBSD licence)

Debug:

Fiddler - HTTP Debug          Win32 (Freeware)

輕量級:

tinyproxy - A lightweight, non-caching, optionally anonymizing http proxy

privoxy - Privacy enhancing HTTP Proxy

hpsockd - SOCKS server

/usr/sbin/hpsockd

/usr/share/doc/hpsockd/examples/hpsockd.conf

iptables:

http://datahunter.org/proxy_iptables