$ HEAD -PS http://en.wikipedia.org/ HEAD http://en.wikipedia.org/ --> 403 Forbidden Connection: close Date: Sat, 21 Feb 2009 19:49:14 GMT Via: 1.0 sq29.wikimedia.org:80 (squid/2.7.STABLE6) Server: squid/2.7.STABLE6 Content-Length: 59481 Content-Type: text/html Client-Date: Sat, 21 Feb 2009 19:49:14 GMT Client-Peer: 208.80.152.2:80 Client-Response-Num: 1 X-Cache: MISS from sq29.wikimedia.org X-Cache-Lookup: NONE from sq29.wikimedia.org:80 X-Squid-Error: ERR_ACCESS_DENIED 0

Tried from both California and Taiwan.