Expose locally-running apps to stable public HTTPS URLs using a single per-developer Cloudflare Tunnel (cloudflared). Use whenever you need an external service to reach your local dev server — receiving webhooks (Box, Stripe, GitHub, Twilio, etc.), testing OAuth callbacks, sharing a work-in-progress with a teammate, or previewing on a real device. Also use when the user mentions cloudflared, "tunnel", "trycloudflare", "public URL for localhost", "webhook can't reach my machine", or asks how to route a domain to their local port.