no chance asking only the header from a existing page [http://de.wikipedia.org/wiki/Hauptseite] delivers: HTTP/1.0 200 OK... and from a non existing Page i get HTTP/1.0 200 OK... Testing the Special:Export HTTP/1.0 301 Moved Permanently in both cases, existing page and non existing There are extra Header information like X-Cache: MISS or X-Cache: HIT so why not add some extra header in Special:Export ----------------------------------------------------- X-Visited: 24031 X-Status: created 2005... X-Modified: blabla That will reduce the traffic. Traffic reduction is essential. You can build private dynamic mirrors with your reduced thematic word selection and still keep it actual by requesting the headers and update outdated pages if needed on the fly. Using it the other way round, you can build a peer version of wikipedia using a moved temporary header redirecting to all the copies in the world as cache Andres Obrero Jamie Bliss schrieb: