gci-url-shortener.go

package main

import (
	"net/http"
	"log"
)

var urlMap = map[string]string{
	"google": "https://google.com",
	"github": "https://github.com",
	"gci": "https://codein.withgoogle.com",
}

func handler(w http.ResponseWriter, r *http.Request) {
	http.Redirect(w, r, urlMap[r.URL.Path[1:]], 301)
}

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