is it possible to write a mod_rewrite rule, which reroutes requests to another server, if they are not found on the current server e.g.: Requested URL: www.foo.com/home.php Backup URL: www.bar.com/home.php The redirect should only be made if the Requested URL delivers a 404 message.
You can do what you want using mod_rewrite:
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^/(.*) http://www.bar.com/$1 [R,L]
See https://httpd.apache.org/docs/2.2/rewrite/ for information on how to
use mod_rewrite.
Alternatively, you could set up an ErrorDocument on your server to handle all 404 errors. Have this ErrorDocument be a script that gets the URI path the user was trying to access from the REDIRECT_* environment variables and then prints HTTP response headers to redirect the user to the appropriate URL for www.bar.com. For details, see https://httpd.apache.org/docs/2.2/custom-error.html
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