[mod_python] in modpython ,how to restrict the upload file size?

This solution works fine only for Opera web browser for me. Others (I've  
tested Firefox and IE6) continues with transfer. In http specification is  
about "413: Request Entity Too Large" among others written:

"The server MAY close the connection to prevent the client from continuing  
the request."

I was trying to find way, how force client to stop the transfer and to  
redirect them to some explanation page. But with no result. Do you have  
any ideas? Or is it possible, that problem is somewhere else? e.g. wrong  
configuration of Apache, mod_python...?

(using Apache/2.2.3, mod_python/3.3.1 Python/2.4.4 on Debian)

Best regards Ohin