Maybe the branding is a bit opaque, you might have more luck searching for Cloudflare Tunnels since they've changed some names. That's probably my bad for not using the word "Tunnel" in my original comment. Here's a blog post describing the product [1], and here's a link right into the middle of CLI docs to a command where they publish a site from localhost, and here's [3] a link to my crappy "blog" post that summarizes the process.

Like I said, I literally just deployed apps from localhost yesterday and today.

1. https://blog.cloudflare.com/argo-tunnel/

2. https://developers.cloudflare.com/cloudflare-one/connections...

3. https://blog.jorissen.xyz/posts/self-hosting-with-cloudflare...