hanyuu/src/RoutingErrorHandler.php

<?php
namespace Hanyuu;

use Index\Http\{HttpResponseBuilder,HttpRequest};
use Index\Http\ErrorHandling\HtmlErrorHandler;

class RoutingErrorHandler extends HtmlErrorHandler {
    #[\Override]
    public function handle(HttpResponseBuilder $response, HttpRequest $request, int $code, string $message): void {
        $path = HAU_DIR_PUBLIC . sprintf('/error-%03d.html', $code);
        if(is_file($path)) {
            $response->setTypeHTML();
            $response->setContent(file_get_contents($path));
            return;
        }

        parent::handle($response, $request, $code, $message);
    }
}