Using a site’s home page as an error document is a good way to prevent people and ‘bots from learning more about the site architecture. Routing all error requests to the home page, or some other page, will reduce information leaks, such as ‘file not found’, ‘access denied’, and script failures which could display error information.

It is important to monitor the server error log to see what errors are occurring. Be sure there is a robots.txt file, even if it is empty. Check the log and stats to see what files people are requesting.

Be careful not to confuse legitimate users - if you remove pages or update content frequently, you may want to use 301 redirects for those pages to alert site visitors and search engines of the change.