golang templates not working with httprouter

I've created nested templating that works when I use "net/http" and http.HandelFunc , however, I've decided to use "github.com/julienschmidt/httprouter" going forward as I want to have move flexibility and now my templates don't work, I get a 404 error.

Please, can you help?

Directory structure

/
/main.go
/templates
/templates/tstats/file.go.html

This code works

func init() {
    tpl = template.Must(template.ParseGlob("templates/*.go.html"))
}
http.HandleFunc("/tstats/", serveTemplate)

func serveTemplate(w http.ResponseWriter, r *http.Request) {
    lp := filepath.Join("templates", "layout.html")
    fp := filepath.Join("templates", filepath.Clean(r.URL.Path))
    gh := filepath.Join("templates", "INC_Header.go.html")
    gn := filepath.Join("templates", "INC_Nav.go.html")
    gf := filepath.Join("templates", "INC_Footer.go.html")
    //log.Println(r.URL.Path)

tpl, err := template.ParseFiles(lp, fp, gh, gn, gf)
if err := tpl.ExecuteTemplate(w, "layout", nil); err != nil {
    log.Println(err.Error())
    http.Error(w, http.StatusText(500), 500)
}

The new code that is producing a 404

func serveTemplate(w http.ResponseWriter, r *http.Request, _ 
    httprouter.Params) {
    lp := filepath.Join("templates", "layout.html")
    fp := filepath.Join("templates", filepath.Clean(r.URL.Path))
    gh := filepath.Join("templates", "INC_Header.go.html")
    gn := filepath.Join("templates", "INC_Nav.go.html")
    gf := filepath.Join("templates", "INC_Footer.go.html")
    //log.Println(`enter code here`r.URL.Path)

    tmpl, err := template.ParseFiles(lp, fp, gh, gn, gf)
    if err := tmpl.ExecuteTemplate(w, "layout", nil); err != nil {
        log.Println(err.Error())
        http.Error(w, http.StatusText(500), 500)
   }

Revising after the comment response. I had a look https://play.golang.org/p/iHUqZQQcv3

You have following issues:

1. Router handler register issue r.GET("/tstats/", serveTemplate) - It will only match http://localhost:8080/tstats/ rest everything is 404
   • For e.g.: 404 -> http://localhost:8080/tstats/myfile1.html
2. The way you calculate the template path file filepath.Join("templates", filepath.Clean(r.URL.Path))

Honestly it is very hard to guess, how you're planning/designing your application. Anyway-

Update your code like below:

• Change /tstats/ => /tstats/*tmpl in the router mapping
• Change fp := filepath.Join("templates", filepath.Clean(r.URL.Path)) => fp := filepath.Join("templates", "tstats", params.ByName("tmpl"))

Now, for the request http://localhost:8080/tstats/myfile1.html. It will look for template here templates/tstats/myfile1.html.

(This was initial response)

It seems like HandlerFunc register issue that leading to 404.

I have created sample from your code, can you try https://play.golang.org/p/6ilS0htj-I

BTW, I believe; in your first sample code tpl variable in the func init is not used. Since you have local variable of same name in the serveTemplate.