Preflight requests handled by @Filters blocked by CorsFilter

[ThomasIommi]

Hello!

As mentioned in issue #7934, it seems that the router might not recognize paths defined using patterns like those used by @Filters.
I'm afraid that checking for known paths reintroduce the same issue, causing all requests to a proxy filter to be blocked by the CORS filter with a 403 Forbidden error.

This situation seems to prevent us from implementing solutions suggested in the official documentation, such as the one found here: https://docs.micronaut.io/latest/guide/#proxyClient

Here's a snippet of the code in question:

@Nullable
private boolean validatePreflightRequest(@NonNull HttpRequest<?> request,
                                         @NonNull CorsOriginConfiguration config) {
    ...
    List<HttpMethod> availableHttpMethods = router.findAny(request).stream().map(UriRouteMatch::getHttpMethod).toList();
    if (availableHttpMethods.stream().noneMatch(method -> method.equals(methodToMatch))) {
        return false;
    }    
    ...
    return true;
}

Originally posted by @ThomasIommi in #11097 (comment)