--- /usr/lib/python2.6/urllib2.py.orig  2009-09-12 00:14:26.000000000 +0200
+++ /usr/lib/python2.6/urllib2.py       2009-09-12 01:22:49.000000000 +0200
@@ -111,7 +111,7 @@
      splitattr, ftpwrapper, splituser, splitpasswd, splitvalue)
 
 # support for FileHandler, proxies via environment variables
-from urllib import localhost, url2pathname, getproxies
+from urllib import localhost, url2pathname, getproxies, proxy_bypass
 
 # used in User-Agent header sent
 __version__ = sys.version[:3]
@@ -694,6 +694,9 @@
         proxy_type, user, password, hostport = _parse_proxy(proxy)
         if proxy_type is None:
             proxy_type = orig_type
+        if proxy_bypass(req.host):
+            # Let other handlers take care of it
+            return None
         if user and password:
             user_pass = '%s:%s' % (unquote(user), unquote(password))
             creds = base64.b64encode(user_pass).strip()