FileServer prefix path problem

[didip]

import (
    "os"
    "net/http"
    "github.com/pressly/chi"
)

r := chi.NewRouter()

workDir, _ := os.Getwd()
r.FileServer("/static", http.Dir(filepath.Join(workDir, "static")))

Expected URL: /static/moment/moment.min.js
But I got: /moment/moment.min.js

How can I set it so the /static prefix is preserved?

[didip]

This is my mistake, the feature works as expected.

Sorry for wasting your time.