Как ответить на post запрос в golang?

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package main

import (
	"fmt"
	"net/http"
)

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

func handler(w http.ResponseWriter, r *http.Request) {
	if r.Method == "POST" {
		w.WriteHeader(http.StatusOK)
		w.Write([]byte("Hello, World!"))
		return
	}

	http.Error(w, "Only POST requests are allowed", http.StatusMethodNotAllowed)
}