Index: Lib/httplib.py
===================================================================
--- Lib/httplib.py	(revision 85181)
+++ Lib/httplib.py	(working copy)
@@ -915,7 +915,7 @@
         if self.__state != _CS_REQ_STARTED:
             raise CannotSendHeader()
 
-        hdr = '%s: %s' % (header, '\r\n\t'.join(values))
+        hdr = '%s: %s' % (header, '\r\n\t'.join([str(v) for v in values]))
         self._output(hdr)
 
     def endheaders(self, message_body=None):
Index: Lib/test/test_httplib.py
===================================================================
--- Lib/test/test_httplib.py	(revision 85181)
+++ Lib/test/test_httplib.py	(working copy)
@@ -1,3 +1,4 @@
+import httplib
 import array
 import httplib
 import StringIO
@@ -64,8 +65,6 @@
         # Some headers are added automatically, but should not be added by
         # .request() if they are explicitly set.
 
-        import httplib
-
         class HeaderCountingBuffer(list):
             def __init__(self):
                 self.count = {}
@@ -91,6 +90,13 @@
                 conn.request('POST', '/', body, headers)
                 self.assertEqual(conn._buffer.count[header.lower()], 1)
 
+    def test_putheader(self):
+        conn = httplib.HTTPConnection('example.com')
+        conn.sock = FakeSocket(None)
+        conn.putrequest('GET','/')
+        conn.putheader('Content-length',42)
+        self.assertTrue('Content-length: 42' in conn._buffer)
+
 class BasicTest(TestCase):
     def test_status_lines(self):
         # Test HTTP status lines