.htAccess REdirect without 302

I have the following .htaccess:

RewriteEngine on
RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
rewriterule .* LoadSite.php

What I am trying to do is that if the file doesn't exist then call LoadSite.php... this will then load any number of other php files via include (dependi开发者_开发技巧ng on the url).... this works for a GET request, but when the a POST is made, I does a 302 redirect and therefore the script doesn't get the POST variables. Any ideas would be appreciated

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Tested and works:

.htaccess:

<IfModule mod_rewrite.c>
   RewriteEngine On
   RewriteBase /
   RewriteCond %{REQUEST_FILENAME} !-f
   RewriteCond %{REQUEST_FILENAME} !-d
   RewriteRule (.*) /err.php?reason=404
</IfModule>