Light and customizable http(s) proxy server with ipv6 support

 ffproxy is a filtering HTTP/HTTPS proxy server.
  - It is able to filter by host, URL, and header.
  - Custom header entries can be filtered and added.
  - It can even drop its privileges and be chrooted.
  - Logging to syslog() is supported.
  - It can use another auxiliary proxy server.
  - HTTP accelerator feature (acting as front-end to a HTTP server) is included.
  - It allows transparent IPv6 over IPv4 browsing (and vice versa).