func ExampleHandler(w http.ResponseWriter, r *http.Request) {
	w.WriteHeader(http.StatusOK)
	fmt.Fprintf(w, "Hello Packt")
	log.Println("completed")
	return
}
ExampleHandler handles the http requests send to this webserver
package main
import (
	"fmt"
	"log"
	"net/http"
	"github.com/gorilla/mux"
)