You need a self-signed certificate and a local HTTPS server (e.g., mkcert + http-server -S -p 11501).
Tools like Nginx, Apache, or Caddy sometimes bind to high ports for testing before going live. A reverse proxy listening on port 11501 could forward requests to backend services. localhost11501
Cause: Firewall blocking the port, or the service is overloaded.
Fix: You need a self-signed certificate and a local