sending headers in mod_python

Hi, I need some help here please..
I'm using with mod_python.
In the request handler I want to redirect the client to a new url,
but it seems that the 'Locate' header(and any other header that I tried) is not being sent to the client.

The code of testPage.py is:

from mod_python import apache

def handler(req):
req.headers_out.add('Location:','http://www.cnn.com')
#req.write("blabla")

Here's the .htacess file's code:

AddHandler python-program .py
PythonHandler testPage
PythonDebug On

RewriteEngine on
RewriteRule !\.(gif|jpg|png|css)$ testPage.py


What am I doing wrong?!

thanks
Roy

using:

req.headers_out.add("Location", 'http://www.google.com/')
raise apache.SERVER_RETURN, apache.HTTP_SEE_OTHER