diff --git a/.claude/launch.json b/.claude/launch.json
new file mode 100644
index 0000000..f9e83c1
--- /dev/null
+++ b/.claude/launch.json
@@ -0,0 +1,11 @@
+{
+  "version": "0.0.1",
+  "configurations": [
+    {
+      "name": "appRobotHoming",
+      "runtimeExecutable": "node",
+      "runtimeArgs": ["server/server.js"],
+      "port": 2093
+    }
+  ]
+}
diff --git a/server/server.js b/server/server.js
index 6f78efd..9ebc491 100755
--- a/server/server.js
+++ b/server/server.js
@@ -27,6 +27,12 @@ const HTTPS_KEY_PATH = process.env.HTTPS_KEY_PATH || path.join(__dirname, '..',
 const HTTPS_CERT_PATH = process.env.HTTPS_CERT_PATH || path.join(__dirname, '..', 'https', 'localhost.pem');
 const HTTPS_PASSPHRASE = process.env.HTTPS_PASSPHRASE || 'abcd';
 
+// .html/.js immer revalidieren lassen (kein stilles Stale-Caching durch Browser/Proxy
+// nach Code-Änderungen, z.B. boardViewer.html) – Bilder/STL etc. bleiben normal cachebar.
+app.use((req, res, next) => {
+  if (/\.(html|js)$/.test(req.path)) res.setHeader('Cache-Control', 'no-cache');
+  next();
+});
 app.use(express.static(publicDir));
 
 app.get('/api/health', (req, res) => {