Where does the 404 redirection happen?

4 comments

1. Based on your comments, I think I get what you’re saying. However, you don’t want to redirect on a 404, since it defeats the object of the ‘Not Found’ header.

   However, you can filter the 404 template path and pass back your own;

   function __custom_404( $standard_404 )
   {
       if ( something_is_true() )
           return '/absolute/path/to/custom.php';
       return $standard_404;
   }
   add_filter( '404_template', '__custom_404' );
   

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2. Going off of TheDeadMedic you can try this:

   Not 100% that this will work

   function wpse_20157_404( $standard_404 ) {  
       if ( is_single() || is_tag('whatever','product' && is_404()) ) // Use || to list multiple if's
           include_wordpress_template(TEMPLATEPATH . '/custom404.php');
   }
   add_action( 'template_redirect', 'wpse_20157_404' );
   

   Or my original answer

   function wpse_20157_404( $standard_404 ) {  
       if ( is_single() || is_tag('whatever','product') ) // Use || to list multiple if's
           include_wordpress_template(TEMPLATEPATH . '/custom404.php');
   }
   add_filter( '404_template', 'wpse_20157_404' );
   

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3. at the top of your 404.php add:

   if ($_SERVER['HTTP_REFERER'] == "Whatever"){
       include('another.php');
       break;
   }
   

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4. Since 404’s happen at the server the best way to redirect a 404 away from WordPress’ 404.php is by adding this to the .htaccess file at your site root.

     ErrorDocument 404 /relative/path/to/404page
   

   This must be a relative path, not an absolute path.

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