CIiBug? Url Encode /Url Decode problem in url Query Strings

[eluser]mindprojects[/eluser]
Thanks, but now i can see into the url something like spaces instead of plus signs!
Using an input box to submit a string i have:

1)rawurlencode(a + b) => into the url i can see : a %2_B b
INPUT TEXT RESULT(doing rawurldecode($this->uri->segment(x))) : a + b


2)urlencode(a + b) => into the url i can see : a+%2_B+b
INPUT TEXT RESULT(doing urldecode($this->uri->segment(x))) : a b

I would like to do something like in ebay:
Into the searchbox type a + b:

URL RESULT: =a+%2_B+b& (it uses urlencode)
INPUT TEXT RESULT : a + b (do they urldecode or using GET directly ?)

If i use GET,like in this thread http://ellislab.com/forums/viewthread/99570/ it works without urldecode, but they say that setting PATH INFO in your config,your app may not work on all servers.