Comment 12 for bug 813295

looking at changes between alpha1 and alpha2 (tag:2.7.2~rc1-2..tag:2.7.2-2) one change that looks suspicious is

diff -r 8527427914a2 Lib/urllib2.py
--- a/Lib/urllib2.py
+++ b/Lib/urllib2.py
@@ -1172,6 +1172,8 @@
                 r = h.getresponse()
         except socket.error, err: # XXX what error?
             raise URLError(err)
+ finally:
+ h.close()

         # Pick apart the HTTPResponse object to get the addinfourl
         # object initialized properly.

that came from upstream changeset 70837:18e6ccc332d5 [1] that reports to fix issue 12133 [2]

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[1] http://code.activestate.com/lists/python-checkins/97757/
[2] http://bugs.python.org/issue12133