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Custom error pages can give a more professional, complete feel to your site. They can also let your visitors know who to contact if there is a problem such as a broken link.
To configure your own error pages, add the following lines to your .htaccess file in your "www" directory:
ErrorDocument 401 /401.html
ErrorDocument 403 /403.html
ErrorDocument 404 /404.html
ErrorDocument 500 /500.html
Then, upload your 401.html, 403.html, 404.html, and 500.html into your "www" directory. These pages should all have the following code somewhere between the <head> and </head> tags to prevent search engines from indexing these pages:
<meta name="robots" content="noindex,nofollow">
Once this is done, whenever there is a 401, 403, 404, or 500 error, the visitor will see your own error document instead of the server's default error message.
The most common error conditions:
400 Bad Request (unrecognized command. usually GET or POST)
401 Unauthorized (incorrect username/password)
403 Forbidden (no permission to access)
404 Not Found (does not exist)
405 Method Not Allowed (trying to POST to a html file, etc.)
500 Internal Server Error (CGI script not working properly)