From 7cab1df12095aa6bf0b599563a5d1deb52666a77 Mon Sep 17 00:00:00 2001
From: Stefan Koelle <stefan.koelle@gmail.com>
Date: Wed, 5 Aug 2026 21:18:24 +0200
Subject: [PATCH] sync retry after logging

---
 src/carddav_client.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/carddav_client.py b/src/carddav_client.py
index 99cb57e..2275be1 100644
--- a/src/carddav_client.py
+++ b/src/carddav_client.py
@@ -48,6 +48,9 @@ class CardDAVClient:
         )
         if resp.status_code == 403 and "valid-sync-token" in resp.text:
             raise SyncTokenInvalid("sync-token vom Server abgelehnt")
+        if resp.status_code == 503:
+            retry_after = resp.headers.get("Retry-After")
+            logger.warning("503 Service Unavailable — Retry-After: %s", retry_after or "nicht angegeben")
         resp.raise_for_status()
         return ET.fromstring(resp.content)