In Lion, if you try to access web pages present in /Library/WebServer/Documents which is the default webroot specified in httpd.conf, the pages may not be served by Apache. Even if you change the DocumenRoot  in httpd.conf  to  any other location and try to access the web pages, the pages will not be accessible from Apache. If you face the issue of web pages not being served by Apache ,you can look  into the Apache logs.In our case...