diff -r 4c65f8641d89 -r d3c6ab639306 Lib/urllib/response.py
--- a/Lib/urllib/response.py	Tue Apr 15 13:52:21 2014 +0100
+++ b/Lib/urllib/response.py	Wed Apr 16 13:20:14 2014 -0400
@@ -6,60 +6,39 @@
 headers and a geturl() method that returns the url.
 """
 
-class addbase(object):
+import tempfile
+
+__all__ = ['addbase', 'addclosehook', 'addinfo', 'addinfourl']
+
+
+class addbase(tempfile._TemporaryFileWrapper):
     """Base class for addinfo and addclosehook."""
 
     # XXX Add a method to expose the timeout on the underlying socket?
 
     def __init__(self, fp):
-        # TODO(jhylton): Is there a better way to delegate using io?
+        super(addbase,  self).__init__(fp, '<urllib response>', delete=False)
+        # Keep reference around as this was part of the original API.
         self.fp = fp
-        self.read = self.fp.read
-        self.readline = self.fp.readline
-        # TODO(jhylton): Make sure an object with readlines() is also iterable
-        if hasattr(self.fp, "readlines"):
-            self.readlines = self.fp.readlines
-        if hasattr(self.fp, "fileno"):
-            self.fileno = self.fp.fileno
-        else:
-            self.fileno = lambda: None
-
-    def __iter__(self):
-        # Assigning `__iter__` to the instance doesn't work as intended
-        # because the iter builtin does something like `cls.__iter__(obj)`
-        # and thus fails to find the _bound_ method `obj.__iter__`.
-        # Returning just `self.fp` works for built-in file objects but
-        # might not work for general file-like objects.
-        return iter(self.fp)
 
     def __repr__(self):
         return '<%s at %r whose fp = %r>' % (self.__class__.__name__,
-                                             id(self), self.fp)
-
-    def close(self):
-        if self.fp:
-            self.fp.close()
-        self.fp = None
-        self.read = None
-        self.readline = None
-        self.readlines = None
-        self.fileno = None
-        self.__iter__ = None
-        self.__next__ = None
+                                             id(self), self.file)
 
     def __enter__(self):
-        if self.fp is None:
+        if self.fp.closed:
             raise ValueError("I/O operation on closed file")
         return self
 
     def __exit__(self, type, value, traceback):
         self.close()
 
+
 class addclosehook(addbase):
     """Class to add a close hook to an open file."""
 
     def __init__(self, fp, closehook, *hookargs):
-        addbase.__init__(self, fp)
+        super(addclosehook, self).__init__(fp)
         self.closehook = closehook
         self.hookargs = hookargs
 
@@ -68,30 +47,28 @@
             self.closehook(*self.hookargs)
             self.closehook = None
             self.hookargs = None
-        addbase.close(self)
+        super(addclosehook, self).close()
+
 
 class addinfo(addbase):
     """class to add an info() method to an open file."""
 
     def __init__(self, fp, headers):
-        addbase.__init__(self, fp)
+        super(addinfo, self).__init__(fp)
         self.headers = headers
 
     def info(self):
         return self.headers
 
-class addinfourl(addbase):
+
+class addinfourl(addinfo):
     """class to add info() and geturl() methods to an open file."""
 
     def __init__(self, fp, headers, url, code=None):
-        addbase.__init__(self, fp)
-        self.headers = headers
+        super(addinfourl, self).__init__(fp, headers)
         self.url = url
         self.code = code
 
-    def info(self):
-        return self.headers
-
     def getcode(self):
         return self.code