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In my http log, I grepped for "prx" and got this returned (ABSOLUTE PATH REDACTED):
[client 188.8.131.52] script '/myappache_root_path/virtual_host/prx.php' not found or unable to stat, referer: http://www.google.com/
[client 184.108.40.206] script '/myappache_root_path/virtual_host/prx.php' not found or unable to stat, referer: http://www.google.com/intl/en-us/
It's also possible that it's an automated search for unprotected proxy servers. Last night I got a web request in my logs from 220.127.116.11 trying to proxy a request to umsky.com:
18.104.22.168 - - [01/Jan/2006:17:29:19 +1000] "GET http://umsky.com/px.php?p=q1w2e3r4t5y6u7i8o9p0q&f=proxy&p=22.214.171.124:80&sv=0&r=44543 HTTP/1.1" 403 208 "http://umsky.com/ref.php?r=58491" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"
It says that umsky.com is the referer - the only reason I know of for trying to display your own web site through someone else's proxy is to prepare for doing something anonymous. Maybe they value their privacy so much in China, they'd rather surf through my web server