I can't get my subrouter to work properly - http

Question

I have a router like so
r := mux.NewRouter()
    r.PathPrefix("/static/styles/").Handler(http.StripPrefix("/static/styles/",
        http.FileServer(http.Dir("static/styles"))))
book := r.PathPrefix("/books").Subrouter()
    book.HandleFunc("/issued-books/", IssuedBooks)
    book.HandleFunc("/top-trending/", ShowTopTrending)
    book.HandleFunc("/", ShowAllBooks)
    book.HandleFunc("/available/", ShowAvailable)
    r.HandleFunc("/", ShowHome)
    http.ListenAndServe(":8080", r)
The basic handler function structure is below:
func ShowAvailable(w http.ResponseWriter, r *http.Request) {
    tmp := Store{}
for ix, val := range JSON.Books {
         status := &val.IssueStatus
if *status == false {
             tmp.Books = append(tmp.Books, JSON.Books[ix])
}
}
renderTemplate(&w, "available.html", &tmp)
}
renderTemplate is defined like so :
func renderTempate(w *http.ResponseWriter, filename string, tmp *Store) {
    path := "static/" + filename
    tmpl := template.Must(template.ParseFiles(path))
    buf := new(bytes.Buffer)
if err := tmpl.ExecuteTemplate(buf, filename, *tmp); err != nil {
         http.Error(*w, err.Error(), http.StatusInternalServerError)
return
}
mime.AddExtensionType(".css", "text/css; charset=utf-8")
    res := *w
    res.Write(buf.Bytes())
    res.(http.Flusher).Flush()
}
The first Issue is it never renders the css file correctly....the browser always ends up saying ....
Refused to apply style sheet from /path/to/css.... because its MIME type ('text/plain') is not a supported stylesheet MIME type....and i tried using the MIME package to set it correctly just before sending the processed template to the client but it still wont work.
The Second Issue is the HTML rendering becomes inconsistent....only the ShowAllBooks page displayed, others didn't,
giving a 404 error...for this i tried removing the forward slash from the URL paths and it all pages displayed...so the forward slash affects the page rendering...any help is deeply appreciated

Answer 1

Remove ending slashed for routes:
book.HandleFunc("/issued-books", IssuedBooks)
book.HandleFunc("/top-trending", ShowTopTrending)
book.HandleFunc("/", ShowAllBooks)
book.HandleFunc("/available", ShowAvailable)
css is supported by GO out of the box - https://github.com/golang/go/blob/master/src/mime/type.go#L60
Check what exactly server returns for for css links. Could it be 404?