From e20f02ea8a977997011879f35a53f65f54812414 Mon Sep 17 00:00:00 2001
From: Flexomatic81 <hadzic@tradeo.de>
Date: Fri, 27 Feb 2026 16:22:38 +0100
Subject: [PATCH] Document health check IPv6 fix in developer guide

---
 docs/DEVELOPER-GUIDE.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/DEVELOPER-GUIDE.md b/docs/DEVELOPER-GUIDE.md
index 6861f2a..dc42a0d 100644
--- a/docs/DEVELOPER-GUIDE.md
+++ b/docs/DEVELOPER-GUIDE.md
@@ -267,6 +267,8 @@ GET /health
 GET /health/ready
 ```
 
+> **Hinweis:** Im Docker Health Check `127.0.0.1` statt `localhost` verwenden, da Alpine Linux `localhost` als `[::1]` (IPv6) auflöst, die App aber nur auf IPv4 (`0.0.0.0`) hört.
+
 ---
 
 ## Repository & Deploy