Chunked HTTP responses in Go

server.go

package main

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

func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		flusher, ok := w.(http.Flusher)
		if !ok {
			panic("expected http.ResponseWriter to be a flusher")
		}

		w.Header().Set("X-Content-Type-Options", "nosniff")

		fmt.Fprintf(w, "Hello")
		flusher.Flush()

		time.Sleep(time.Second * 1)
		fmt.Fprintf(w, ", world!")
	})
	fmt.Println("Server listening on http://localhost:9000")
	http.ListenAndServe(":9000", nil)
}