Golang http request method alternative response

restEndointMethodResponseExample.go

package main

import "net/http"

func main() {
   mainMux := http.NewServeMux()

   mainMux.HandleFunc("/speak", func(res http.ResponseWriter, req *http.Request) {
        if req.Method == "GET" {
            res.Write([]byte("Hello, World!\n"))
        } else if req.Method == "POST" {
            res.Write([]byte("Thank You!\n"))
        } else if req.Method == "DELETE" {
            res.Write([]byte("Goodbye, World!\n"))
        }
   })
   http.ListenAndServe(":3000", mainMux)
}

test.sh

curl http://localhost:3000/speak
curl -X POST http://localhost:3000/speak
curl -X DELETE http://localhost:3000/speak