try to make it work 1

nginx/conf.d/default.conf.template

@@ -1,11 +1,6 @@
 # ---------------------------  ENV-Key übernehmen  ---------------------------
 # envsubst ersetzt ${MEDIA_API_KEY} durch den Wert aus docker-compose.yml
 
-# --------- Preflight-Erkennung per map ---------
-map $request_method $cors_preflight {
-    "OPTIONS" 1;
-    default   0;
-}
 
 server {
     listen 80;
@@ -14,8 +9,8 @@ server {
     root /usr/share/nginx/html;
     index index.html;
 
-    # ---------- Preflight (OPTIONS) ----------
-    if ($cors_preflight = 1) {
+    # --------- Preflight direkt per IF ---------
+    if ($request_method = OPTIONS) {
         add_header Access-Control-Allow-Origin "*";
         add_header Access-Control-Allow-Methods "GET, HEAD, OPTIONS";
         add_header Access-Control-Allow-Headers "Content-Type, X-API-Key";