| Issue | Suggestion |
|-------|-------------|
| Link doesn’t open | No service is listening on port 11501. Check if your app is running. |
| Port already in use | Change the app’s port or kill the process using lsof -i :11501 (Mac/Linux) or netstat -ano | findstr :11501 (Windows). |
| Access from another device | Use your local IP instead of localhost, e.g., http://192.168.1.x:11501. May also need firewall rules. |
| HTTPS required | Some apps enforce HTTPS. Try https://localhost:11501. |
curl -v http://localhost:11501
# The -v flag shows you the handshake, headers, and any errors.
You try to run npm start for a React app (default port 3000). But port 3000 is busy with another project. The development server automatically increments the port number until it finds a free one. Starting at 3000, it checks: localhost11501 link
The terminal then outputs: Local: http://localhost:11501. Clicking this link opens your app. | Issue | Suggestion | |-------|-------------| | Link
If you are building a script or API client that must interact with localhost:11501, here is how to structure your requests. curl -v http://localhost:11501 # The -v flag shows
python3 -m http.server 11501