Index: Lib/http/client.py
===================================================================
--- Lib/http/client.py	(revision 86847)
+++ Lib/http/client.py	(working copy)
@@ -763,6 +763,12 @@
                 if encode:
                     datablock = datablock.encode("iso-8859-1")
                 self.sock.sendall(datablock)
+                
+        elif hasattr(data,'__next__'):
+            if self.debuglevel > 0: print("sending an iterable")
+            for d in data:
+                self.sock.sendall(d)
+
         else:
             self.sock.sendall(data)
 
Index: Lib/urllib/request.py
===================================================================
--- Lib/urllib/request.py	(revision 86847)
+++ Lib/urllib/request.py	(working copy)
@@ -1053,6 +1053,12 @@
                     'Content-type',
                     'application/x-www-form-urlencoded')
             if not request.has_header('Content-length'):
+                # We can't tell ahead of time how much data is in an
+                # iterable object
+                if not hasattr(data, '__read__') and hasattr(data, '__next__'):
+                    raise ValueError(
+                            "No Content-Length specified for iterable body")
+
                 request.add_unredirected_header(
                     'Content-length', '%d' % len(data))
 
Index: Lib/test/test_httplib.py
===================================================================
--- Lib/test/test_httplib.py	(revision 86847)
+++ Lib/test/test_httplib.py	(working copy)
@@ -229,7 +229,23 @@
         sock.data = b''
         conn.send(io.BytesIO(expected))
         self.assertEqual(expected, sock.data)
+        
+    def test_send_iter(self):
+        expected = b'GET /foo HTTP/1.1\r\nHost: example.com\r\n' \
+                   b'Accept-Encoding: identity\r\nContent-Length: 11\r\n' \
+                   b'\r\nonetwothree'
 
+        def body():
+            yield b"one"
+            yield b"two"
+            yield b"three"
+
+        conn = client.HTTPConnection('example.com')
+        sock = FakeSocket("")
+        conn.sock = sock
+        conn.request('GET', '/foo', body(), {'Content-Length': '11'})
+        self.assertEquals(sock.data, expected)
+
     def test_chunked(self):
         chunked_start = (
             'HTTP/1.1 200 OK\r\n'
Index: Lib/test/test_urllib2.py
===================================================================
--- Lib/test/test_urllib2.py	(revision 86847)
+++ Lib/test/test_urllib2.py	(working copy)
@@ -820,7 +820,22 @@
             self.assertEqual(req.unredirected_hdrs["Content-type"], "bar")
             self.assertEqual(req.unredirected_hdrs["Host"], "baz")
             self.assertEqual(req.unredirected_hdrs["Spam"], "foo")
+            
+            # Check iterable body support
+            def iterable_body():
+                yield "one"
+                yield "two"
+                yield "three"
 
+            for headers in {}, {"Content-Length": 11}:
+                req = Request("http://example.com/", iterable_body(), headers)
+                if not headers:
+                    # Having an iterable body without a Content-Length should
+                    # raise an exception
+                    self.assertRaises(ValueError, h.do_request_, req)
+                else:
+                    newreq = h.do_request_(req)
+
     def test_http_doubleslash(self):
         # Checks the presence of any unnecessary double slash in url does not
         # break anything. Previously, a double slash directly after the host