When you load the entrypoint for the API in the live demo:

https://index.torrust-demo.com/api/v1

You see a page like this:

The HTML link for the license is:

<a href="/v1/about/license">license</a>

The link is broken because it redirects to:

https://index.torrust-demo.com/v1/about/license

The right link should be:

https://index.torrust-demo.com/api/v1/about/license

So the corrent <a> elements should be:

<a href="v1/about/license">license</a>

The problem is we are using a subfolder for the API on the live demo and links should be relative.