main.go

package main

import (
	"net/http"

	"github.com/gorilla/mux"
)

// example of a basic handler
func fooHandler(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("foo route\n"))
}

// example of a handler using vars
func barHandler(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("bar route got " + mux.Vars(r)["barID"] + "\n"))
}

// Dedicated handler to serve index.html to root route
func rootHandler(w http.ResponseWriter, r *http.Request) {
	http.ServeFile(w, r, "./static/index.html")
}

func main() {
	r := mux.NewRouter()
    // these two are pretty standard
	r.HandleFunc("/foo", fooHandler).Methods("GET")
    r.HandleFunc("/bar/{barID}", barHandler).Methods("GET")
    // stripPrefix just removes the "static" prefix and passes what's left to http.FileServer. However, there is a special case for the
    // user requesting "index.htm[l]" where it will redirect to the root. See: https://golang.org/src/net/http/fs.go#L540
    // BUT, since http.StripPrefix has removed the static prefix, the redirect points back to root. But, our next route below serves
    // index.html statically from root. Since browsers follow permanent redirects automatically, this is transparent from a browser
    // perspective, but requires `curl -L` to properly follow with curl.
	r.PathPrefix("/static/").Handler(http.StripPrefix("/static/", http.FileServer(http.Dir("./static/"))))
	r.HandleFunc("/", rootHandler).Methods("GET")
	http.ListenAndServe(":8080", r)
}