--- a/req.py	Fri Nov 16 11:41:38 2012 +0100
+++ b/req.py	Fri Nov 16 11:52:06 2012 +0100
@@ -427,7 +427,7 @@
         """return the root url of the instance
         """
         if secure:
-            raise NotImplementedError()
+            return self.vreg.config.get('https-url', self.vreg.config['base-url'])
         return self.vreg.config['base-url']
 
     # abstract methods to override according to the web front-end #############