From 22d0da73acdbd44ae1cdd094e8e56025830d42d7 Mon Sep 17 00:00:00 2001
From: Pablo Zmdl <pablo@nextcloud.com>
Date: Thu, 5 Feb 2026 12:35:14 +0100
Subject: [PATCH] 404 error handler for less app output pollution

Signed-off-by: Pablo Zmdl <pablo@nextcloud.com>
---
 php/public/index.php | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/php/public/index.php b/php/public/index.php
index 1ec42949..c4b41417 100644
--- a/php/public/index.php
+++ b/php/public/index.php
@@ -197,4 +197,13 @@ $app->get('/', function (\Psr\Http\Message\RequestInterface $request, Response $
 
 $errorMiddleware = $app->addErrorMiddleware(false, true, true);
 
+// Set a custom Not Found handler, which doesn't pollute the app output with 404 errors.
+$errorMiddleware->setErrorHandler(
+    \Slim\Exception\HttpNotFoundException::class,
+    function (Request $request, Throwable $exception, bool $displayErrorDetails) use ($app) {
+        $response = $app->getResponseFactory()->createResponse();
+        $response->getBody()->write('Not Found');
+        return $response->withStatus(404);
+    });
+
 $app->run();