using support.transient_internet helper method in the urllib2net test.

Lib/test/test_urllib2net.py

@@ -178,15 +178,19 @@ class OtherNetworkTests(unittest.TestCase):
         # Some sites do not send Connection: close header.
         # Verify that those work properly. (#issue12576)
 
+        URL = 'http://www.imdb.com' # mangles Connection:close
+
+        with support.transient_internet(URL):
             try:
-            with urllib.request.urlopen('http://www.imdb.com') as res:
+                with urllib.request.urlopen(URL) as res:
                     pass
             except ValueError as e:
-            self.fail("urlopen failed for sites not sending Connection:close")
+                self.fail("urlopen failed for site not sending \
+                           Connection:close")
             else:
                 self.assertTrue(res)
 
-        req = urllib.request.urlopen('http://www.imdb.com')
+            req = urllib.request.urlopen(URL)
             res = req.read()
             self.assertTrue(res)