diff --git a/Lib/test/test_urllib2.py b/Lib/test/test_urllib2.py
index 8093f0e..f1c478c 100644
--- a/Lib/test/test_urllib2.py
+++ b/Lib/test/test_urllib2.py
@@ -947,6 +947,22 @@
         self.assertEqual([(handlers[0], "http_open")],
                          [tup[0:2] for tup in o.calls])
 
+    def test_proxy_no_proxy(self):
+        os.environ['no_proxy'] = 'python.org'
+        o = OpenerDirector()
+        ph = urllib.request.ProxyHandler(dict(http="proxy.example.com"))
+        o.add_handler(ph)
+        req = Request("http://www.perl.org/")
+        self.assertEqual(req.get_host(), "www.perl.org")
+        r = o.open(req)
+        self.assertEqual(req.get_host(), "proxy.example.com")
+        req = Request("http://www.python.org")
+        self.assertEqual(req.get_host(), "www.python.org")
+        r = o.open(req)
+        self.assertEqual(req.get_host(), "www.python.org")
+        del os.environ['no_proxy']
+
+
     def test_proxy_https(self):
         o = OpenerDirector()
         ph = urllib.request.ProxyHandler(dict(https="proxy.example.com:3128"))
diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py
index f787407..9f7ebd7 100644
--- a/Lib/urllib/request.py
+++ b/Lib/urllib/request.py
@@ -657,6 +657,10 @@
         proxy_type, user, password, hostport = _parse_proxy(proxy)
         if proxy_type is None:
             proxy_type = orig_type
+
+        if req.host and proxy_bypass(req.host):
+            return None
+
         if user and password:
             user_pass = '%s:%s' % (unquote(user),
                                    unquote(password))