在Golang HTTP或Gorilla包中获取路由和参数列表

When I write a simple web application like this:

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hi there, I love %s!", r.URL.Path[1:])
}

func main() {
    http.HandleFunc("/about", handler)
    http.ListenAndServe(":8080", nil)
}

How can I find the list of routes and params which I defined in my web app? e.g find "/about" in this example.

EDIT 1: How can get this one params and route?

gorilla.HandleFunc(`/check/{id:[0-9]+}`, func(res http.ResponseWriter, req *http.Request) {
    res.Write([]byte("Regexp works :)"))
})