404 (Not Found) errors when converting a web app into Lorca desktop app

Background

There is a web app of https://threejs.org/editor/ with its source code as part of three.js repository:

https://github.com/mrdoob/three.js/tree/master/editor

I'm trying to use the above with Lorca to create a desktop app version of the web app.

First approach

As sugggested here, I use the Lorca counter example as a base. I copy the counter example in this location:

/home/m3/go/src/lorca-3d-editor

Then I clone the three.js at this location:

/home/m3/repos/three.js

The three.js editor would be at:

/home/m3/repos/three.js/editor

Now, I change the Lorca counter example source code like this, note that http.Dir()
is setting an absolute path:

	ln, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		log.Fatal(err)
	}
	defer ln.Close()
	go http.Serve(ln, http.FileServer(http.Dir("/home/m3/repos/three.js/editor")))
	ui.Load(fmt.Sprintf("http://%s", ln.Addr()))

The commit diff would be:

But I get these 404 (Not Found) errors:

Second approach

I keep a copy of Lorca counter example here:

/home/m3/go/src/lorca-3d-editor

Then, I copy the whole three.js source code over here:

/home/m3/go/src/lorca-3d-editor/three.js

So, the web app source code would be at:

/home/m3/go/src/lorca-3d-editor/three.js/editor

Now, I change the Lorca counter example source code like this, note that http.Dir("three.js/editor") is setting a relative path:

	ln, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		log.Fatal(err)
	}
	defer ln.Close()
	go http.Serve(ln, http.FileServer(http.Dir("three.js/editor")))
	ui.Load(fmt.Sprintf("http://%s", ln.Addr()))

Now I'm getting some 404 (Not Found) again:

Possible problem

Possibly, the problem is that the web app inside three.js/editor is referencing some files throughout the three.js repository. But when serving a Go HTTP server of static files inside three.js/editor, the HTTP server cannot find all the external files which are scattered throughout three.js repository referenced by contents of three.js/editor or contents of three.js repository itself. What would be the best practice to resolve such problem?

Keeping a copy of Lorca counter example here:

/home/m3/go/src/lorca-3d-editor

Also, keeping the whole three.js source code at:

/home/m3/go/src/lorca-3d-editor/three.js

So, the web app source code would be at:

/home/m3/go/src/lorca-3d-editor/three.js/editor

Now, the problem is resolved by such a commit:

Now ThreeJS editor runs fine by Lorca: