Lighttpd

Hello ?I have some problem about lighty 1.5 pre_release.
I use mod_core_proxy + Mongrel Cluster for ruby on rails application.

When I type some invaild char like " or < on URL.
Like

http://lala.abc.com/con/action/123"  or 
http://lala.abc.com/con/action/123<

Something strange happen, the lighty's CPU usage will reach 99%.
And nothing return.
Because Safari will not auto escape the invaild url char, so this
probelm happen.
Firefox and IE will auto escape the invaild url char, so no probelm
happen.

I will check the same url with lighty 1.4.11 + fastcgi, and there are no these problem.First, I use http://lala.abc.com/con/action/123" this invaild url
connect mongrel directly.
And mongrel return connect close for some reason.
Maybe lighty 1.5 cannot find the mongrel return and boom !!And second, apache 2.2 + mod_proxy_balnacer will be ok for this invild
url request.

-- thegiive