headers.update is not the same that add headers one by one with add_header

diff --git a/requests/models.py b/requests/models.py
index 08f3e32146af92b7f1e4039d9ff140e7a8345c60..3c0d0517e4fc8647dfc28820c5e4e78a8e375c98 100644 (file)
--- a/requests/models.py
+++ b/requests/models.py
@@ -300,7 +300,8 @@ class Request(object):
                 req = _Request(url, data=self._enc_data, method=self.method)
 
         if self.headers:
-            req.headers.update(self.headers)
+            for k,v in self.headers.iteritems():
+                req.add_header(k, v)
 
         if not self.sent or anyway: