net/http server (chunked)

main.go

package main

import (
	"io"
	"log"
	"net/http"
)

func main() {
	err := run()
	if err != nil {
		log.Fatal(err)
	}
}

func handlerChunked(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Transfer-Encoding", "chunked")
	flusher, ok := w.(http.Flusher)
	if !ok {
		log.Fatal("error")
	}

	io.WriteString(w, "Chunk1\n")
	flusher.Flush()

	io.WriteString(w, "Chunk2Chunk2\n")
	flusher.Flush()

	//w.Header().Set("Content-Length", "0")
}

func handler(w http.ResponseWriter, r *http.Request) {
	io.WriteString(w, "Chunk1\n")
}

func run() error {
	http.HandleFunc("/chunked", handlerChunked)
	http.HandleFunc("/", handler)
	return http.ListenAndServe(":8080", nil)
}

httputil.DumpResponse() した結果は以下。
14 とか 0 とかが余分に追加される。
14 は 16 進数なので 0x14 で 20 であることに注意。

HTTP/1.1 200 OK
Transfer-Encoding: chunked
Date: Sat, 24 Dec 2022 02:00:53 GMT

14
Chunk1
Chunk2Chunk2

0