Go: Simple, Easy, Fast - Building a Go (golang) REST Service with Gorilla - Step 5: http://www.giantflyingsaucer.com/blog/?p=5635

step5-main.go

package main

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"

	"github.com/gorilla/mux"
)

// Movie Struct
type Movie struct {
	Title  string `json:"title"`
	Rating string `json:"rating"`
	Year   string `json:"year"`
}

var movies = map[string]*Movie{
	"tt0076759": &Movie{Title: "Star Wars: A New Hope", Rating: "8.7", Year: "1977"},
	"tt0082971": &Movie{Title: "Indiana Jones: Raiders of the Lost Ark", Rating: "8.6", Year: "1981"},
}

func main() {
	router := mux.NewRouter()
	router.HandleFunc("/movies", handleMovies).Methods("GET")
	router.HandleFunc("/movie/{imdbKey}", handleMovie).Methods("GET", "DELETE", "POST")
	http.ListenAndServe(":8080", router)
}

func handleMovie(res http.ResponseWriter, req *http.Request) {
	res.Header().Set("Content-Type", "application/json")
	vars := mux.Vars(req)
	imdbKey := vars["imdbKey"]

	switch req.Method {
	case "GET":
		movie, ok := movies[imdbKey]
		if !ok {
			res.WriteHeader(http.StatusNotFound)
			fmt.Fprint(res, string("Movie not found"))
		}
		outgoingJSON, error := json.Marshal(movie)
		if error != nil {
			log.Println(error.Error())
			http.Error(res, error.Error(), http.StatusInternalServerError)
			return
		}
		fmt.Fprint(res, string(outgoingJSON))
	case "DELETE":
		delete(movies, imdbKey)
		res.WriteHeader(http.StatusNoContent)
	case "POST":
		movie := new(Movie)
		decoder := json.NewDecoder(req.Body)
		error := decoder.Decode(&movie)
		if error != nil {
			log.Println(error.Error())
			http.Error(res, error.Error(), http.StatusInternalServerError)
			return
		}
		movies[imdbKey] = movie
		outgoingJSON, err := json.Marshal(movie)
		if err != nil {
			log.Println(error.Error())
			http.Error(res, err.Error(), http.StatusInternalServerError)
			return
		}
		res.WriteHeader(http.StatusCreated)
		fmt.Fprint(res, string(outgoingJSON))
	}
}

func handleMovies(res http.ResponseWriter, req *http.Request) {
	res.Header().Set("Content-Type", "application/json")
	outgoingJSON, error := json.Marshal(movies)
	if error != nil {
		log.Println(error.Error())
		http.Error(res, error.Error(), http.StatusInternalServerError)
		return
	}
	fmt.Fprint(res, string(outgoingJSON))
}