Handle HTTP client timeout in Go

handle-http-client-timeout.go

package main

import (
	"io/ioutil"
	"log"
	"net/http"
	"net/http/httptest"
	"net/url"
	"time"
)

func main() {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		time.Sleep(10 * time.Second)
		w.Write([]byte("Did you sleep well?"))
	}))

	cl := &http.Client{
		Timeout: 1 * time.Second,
	}
	req, err := http.NewRequest("GET", srv.URL, nil)
	if err != nil {
		log.Fatal("request creation failed: ", err)
	}

	resp, err := cl.Do(req)
	if err != nil {
		if urlErr, ok := err.(*url.Error); ok {
			if urlErr.Timeout() {
				log.Fatalf("request timed-out: %+v", urlErr)
			}
		}
		log.Fatal("request failed: ", err)
	}
	defer resp.Body.Close()
	data, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Fatal("failed to read response body: ", err)
	}
	log.Println(string(data))
}