diff -r a440ced9a75f -r df109be0567c thirdparty/google_appengine/google/appengine/api/urlfetch.py
--- a/thirdparty/google_appengine/google/appengine/api/urlfetch.py	Sat Dec 06 14:50:45 2008 +0000
+++ b/thirdparty/google_appengine/google/appengine/api/urlfetch.py	Sat Dec 06 16:52:21 2008 +0000
@@ -249,7 +249,7 @@
   for key, value in headers.iteritems():
     header_proto = request.add_header()
     header_proto.set_key(key)
-    header_proto.set_value(value)
+    header_proto.set_value(str(value))
 
   request.set_followredirects(follow_redirects)