Unable to detect REST/rest_no_route

[szepe.viktor]

AFAIK dispatch() in WP_REST_Server replies rest_no_route with HTTP status code 404 on its own

There is no way to detect a HTTP/404 which is elemental for my WAF
​https://github.com/szepeviktor/wordpress-fail2ban/blob/master/mu-plugin/wp-fail2ban-mu-instant.php#L138-L140

Please advise.

[rmccue]

The REST API routing system is independent of template_redirect, since it's not part of the templating system. This is by design. rest_post_dispatch or rest_pre_serve_request can be used to catch errors from the API.

(It's also possible for 404 errors to be generated inside controllers, not just by the routing. For example, a request to a nonexistent post ID will throw a 404.)

[szepe.viktor]

Thank you for your guidance.

I've chosen rest_post_dispatch for status code inspection.