it prints

py_app/app/static/qz-tray-PATCH-NOTES.txt

@@ -0,0 +1,35 @@
+QZ TRAY LIBRARY PATCH NOTES
+===========================
+Version: 2.2.4 (patched for custom QZ Tray with pairing key authentication)
+Date: October 2, 2025
+
+CHANGES MADE:
+-------------
+
+1. Line ~387: Commented out certificate sending
+   - Original: _qz.websocket.connection.sendData({ certificate: cert, promise: openPromise });
+   - Patched: openPromise.resolve(); (resolves immediately without sending certificate)
+   
+2. Line ~391-403: Bypassed certificate retrieval
+   - Original: Called _qz.security.callCert() to get certificate from user
+   - Patched: Directly calls sendCert(null) without trying to get certificate
+   
+3. Comments added to indicate patches
+
+REASON FOR PATCHES:
+------------------
+The custom QZ Tray server has certificate validation COMPLETELY DISABLED.
+It uses ONLY pairing key (HMAC) authentication instead of certificates.
+The original qz-tray.js library expects certificate-based authentication and
+fails when the server doesn't respond to certificate requests.
+
+COMPATIBILITY:
+-------------
+- Works with custom QZ Tray server (forked version with certificate validation disabled)
+- NOT compatible with standard QZ Tray servers
+- Connects to both ws://localhost:8181 and wss://localhost:8182
+- Authentication handled by server-side pairing keys
+
+BACKUP:
+-------
+Original unpatched version saved as: qz-tray.js.backup