only get_header exists in Zope-2.8, whereas only getHeader exists in Zope-2.12.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@41922 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Security/ERP5ExternalAuthenticationPlugin.py

@@ -102,7 +102,7 @@ class ERP5ExternalAuthenticationPlugin(ERP5UserManager):
   def extractCredentials(self, request):
     """ Extract credentials from the request header. """
     creds = {}
-    user_id = request.getHeader(self.user_id_key)
+    user_id = getattr(request, 'getHeader', request.get_header)(self.user_id_key)
     if user_id is not None:
       creds['external_login'] = user_id