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Example of serving templates using both the system filesystem and an in-memory fake filesystem along with custom routes
package main
import (
func main() {
// v1: in memory filesystem
fs := afero.NewMemMapFs()
file, err := fs.Create("templates/index.html")
if err != nil {
file.Write([]byte("Home: <a href='/api'>/api</a>"))
err = file.Close()
if err != nil {
httpFs := afero.NewHttpFs(fs)
fileserver := http.FileServer(httpFs.Dir("templates"))
http.Handle("/", fileserver)
// v2: real filesystem
// http.Handle("/", http.FileServer(http.Dir("templates")))
http.Handle("/api/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("viewing /api"))
http.ListenAndServe(":3000", nil)
// v3: Using httprouter
router := httprouter.New()
router.GET("/", func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
fmt.Printf("GET /: %s\n", r.URL.Path)
http.FileServer(http.Dir(("./templates"))).ServeHTTP(w, r)
router.GET("/api/", func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
fmt.Printf("GET /api/: %s\n", r.URL.Path)
http.ListenAndServe(":3000", router)

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