$_SERVER['QUERY_STRING'] plus-signs and whitespace

[basti]

Hello,
I have the following Problem with Nginx 1.2.1-2.2
running on 3.2.0-4-amd64 #1 SMP Debian 3.2.41-2 x86_64 GNU/Linux

A String like $_SERVER['QUERY_STRING'] = test=1+2 will get $_GET['test']
= 1 2
I have found the following:

|$_GET||[||"q"||] = ||strtr||(||$_GET||[||"q"||], ||"+"||, ||" "||);|
at
http://www.dmuth.org/node/1268/how-get-rid-annoying-plus-signs-drupal-under-nginx

Is there a way to do this, in nginx config?

Regards,
basti
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