Custom method on HTTP request

main.go

// server.go
package main

import "net/http"

func main() {
	mux := http.NewServeMux()
	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    if r.Method != "LENIN" { // only allow LENIN method :3 
			w.WriteHeader(501)
			w.Write([]byte(`Method not implemented`))
			return
		}

		w.WriteHeader(200)
		w.Write([]byte(`Hi Lenin!`))
		return
	})

	http.ListenAndServe(":8000", mux)
}

// client.go
package main

import (
	"fmt"
	"net/http"
	"net/http/httputil"
)

func main() {
	url := "http://localhost:8000/"
	req, _ := http.NewRequest("LENIN", url, nil)

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}

	b, _ := httputil.DumpResponse(resp, true)
	fmt.Println(string(b))
}