Index: httpserver.py
===================================================================
--- httpserver.py       (revision 170)
+++ httpserver.py       (working copy)
@@ -189,8 +189,8 @@
 
         def __call__(self, environ, start_response):
             def xstart_response(status, response_headers, *args):
-                start_response(status, response_headers, *args)
                 self.log(status, environ)
+                return start_response(status, response_headers, *args)
 
             path = environ.get('PATH_INFO', '')
             if path.startswith('/static/'):