Wikipedia:Advice to Tor users in China
 

This presents a problem for Wikipedia users in mainland China, who currently (January 2006) can't edit Wikipedia by normal methods. Luckily there is another way, until such time as the Chinese authorities read this page and close the loophole. The solution is to edit your main Privoxy configuration file as follows:

# Default Tor forward
forward-socks4a / localhost:9050 .

# Unencrypted Wikipedia forwarding
forward *.wikipedia.org 145.97.39.155:80
forward *.wikimedia.org 145.97.39.155:80
forward *.wiktionary.org 145.97.39.155:80
forward *.wikiquote.org 145.97.39.155:80
forward *.wikinews.org 145.97.39.155:80
forward *.wikibooks.org 145.97.39.155:80

# Special servers which 145.97.39.155 won't forward properly
forward-socks4a dumps.wikimedia.org localhost:9050 .
forward-socks4a download.wikimedia.org localhost:9050 .
forward-socks4a mail.wikimedia.org localhost:9050 .
forward-socks4a irc.wikimedia.org localhost:9050 .
forward-socks4a ftp.wikimedia.org localhost:9050 .
forward-socks4a news.wikimedia.org localhost:9050 .
forward-socks4a bugs.wikimedia.org localhost:9050 .
forward-socks4a bugzilla.wikimedia.org localhost:9050 .
forward-socks4a ganglia.wikimedia.org localhost:9050 .
forward-socks4a kate.wikimedia.org localhost:9050 .
forward-socks4a kohl.wikimedia.org localhost:9050 .
forward-socks4a noc.wikimedia.org localhost:9050 .
forward-socks4a stats.wikimedia.org localhost:9050 .
forward-socks4a ticket.wikimedia.org localhost:9050 .
forward-socks4a tools.wikimedia.org localhost:9050 .
forward-socks4a mail.wikipedia.org localhost:9050 .
forward-socks4a bugzilla.wikipedia.org localhost:9050 .
forward-socks4a bugs.wikipedia.org localhost:9050 .
forward-socks4a download.wikipedia.org localhost:9050 .

The Tor forward line should already be there, you would have added it when you installed Tor. The important thing is that the Wikipedia lines must be after the Tor line.

This will give you unencrypted communications to the Wikipedia servers, and will allow the Wikipedia servers to determine your real IP address.