.htaccess, rewrite 404 errors to other domain

Question

How can I redirect all the 404 errors to another domain?

I've found the

Error 404 http://example.com/error.html

But I need:

if Error 404 (.*) http://example.com/$1

I've tried:

RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ http://example.com/$1

But it redirects all the requests, in fact if I run a .php script which generate a page with some 404 links the URL of the script becomes

http://example.com/script.php

Instead the URL should remains the same and just the 404 links should get redirected to the other domain.

Solutions?

Answer 1

1 - Create ErrorDocument directive like this:

ErrorDocument 404 /404.php

2 - Then create your 404.php like this:

<?php
   if ($_SERVER["HTTP_HOST"] == "domain.com") // current domain
      header('Location: http://example.com' . $_SERVER["REQUEST_URI"], TRUE, 301);
?>

UPDATE Using just .htaccess:

RewriteCond %{HTTP_HOST} ^domain\.com$ [NC]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d 
RewriteRule ^ http://example.com%{REQUEST_URI} [L,R=301]