Index: Lib/urllib2.py
===================================================================
--- Lib/urllib2.py	(revisión: 65710)
+++ Lib/urllib2.py	(copia de trabajo)
@@ -1079,8 +1079,8 @@
         h = http_class(host, timeout=req.timeout) # will parse host:port
         h.set_debuglevel(self._debuglevel)
 
-        headers = dict(req.headers)
-        headers.update(req.unredirected_hdrs)
+        headers = dict(req.unredirected_hdrs)
+        headers.update(req.headers)
         # We want to make an HTTP/1.1 request, but the addinfourl
         # class isn't prepared to deal with a persistent connection.
         # It will try to read all remaining data from the socket,