A slow HTTP client

slow_client.go

package main

import (
	"bytes"
	"fmt"
	"io"
	"log"
	"net/http"
	"time"
)

var data = []byte(`{"commands": [{"name": "system/time"}]}`)

func main() {
	sr := slowReader{bytes.NewBuffer(data)}

	req, err := http.NewRequest(http.MethodPost, "http://localhost:8000/v1/bulk", sr)
	if err != nil {
		log.Fatal(err)
	}

	t0 := time.Now()
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		log.Fatal(err)
	}

	log.Printf("\n%s in %v", resp.Status, time.Since(t0))
}

type slowReader struct {
	r io.Reader
}

func (r slowReader) Read(data []byte) (int, error) {
	time.Sleep(250 * time.Millisecond) // Write speed: 4B/s
	n, err := r.r.Read(data[:1])
	if n > 0 {
		fmt.Printf("%s", data[:1])
	}
	return n, err
}