Cloudflare Quick Tunnel (TryCloudflare)

Expose your local server to the Internet with one cloudflared command (just like ngrok). No account registration needed, no installation required (via docker run), and free.

# assume your local server is at http://localhost:300
docker run --rm -it cloudflare/cloudflared tunnel --url http://localhost:300

# if your local server is running inside a Docker container
docker run --rm -it cloudflare/cloudflared tunnel --url http://host.docker.internal:3000

ref:
https://developers.cloudflare.com/cloudflare-one/networks/connectors/cloudflare-tunnel/do-more-with-tunnels/trycloudflare/

You will see something like this in console:

+--------------------------------------------------------------------------------------------+
|  Your quick Tunnel has been created! Visit it at (it may take some time to be reachable):  |
|  https://YOUR_RANDOM_QUICK_TUNNEL_NAME.trycloudflare.com                                   |
+--------------------------------------------------------------------------------------------+

Then you're all set.