Time HTTP requests in Go.

timehttp.go

package main

import (
	"crypto/tls"
	"fmt"
	"net/http"
	"net/http/httptrace"
	"time"
)

func main() {
	req, _ := http.NewRequest("GET", "https://focusfoto.com.br", nil)
	trace := &httptrace.ClientTrace{
		GetConn: func(_ string) {
			fmt.Printf("%30s: %s\n", "GetConn", time.Now())
		},
		GotConn: func(_ httptrace.GotConnInfo) {
			fmt.Printf("%30s: %s\n", "GotConn", time.Now())
		},
		DNSStart: func(_ httptrace.DNSStartInfo) {
			fmt.Printf("%30s: %s\n", "DNSStart", time.Now())
		},
		DNSDone: func(_ httptrace.DNSDoneInfo) {
			fmt.Printf("%30s: %s\n", "DNSDone", time.Now())
		},
		ConnectStart: func(_, _ string) {
			fmt.Printf("%30s: %s\n", "ConnectStart", time.Now())
		},
		ConnectDone: func(_, _ string, _ error) {
			fmt.Printf("%30s: %s\n", "ConnectDone", time.Now())
		},
		TLSHandshakeStart: func() {
			fmt.Printf("%30s: %s\n", "TLSHandshakeStart", time.Now())
		},
		TLSHandshakeDone: func(_ tls.ConnectionState, _ error) {
			fmt.Printf("%30s: %s\n", "TLSHandshakeDone", time.Now())
		},
		WroteHeaders: func() {
			fmt.Printf("%30s: %s\n", "WroteHeaders", time.Now())	
		},
		WroteRequest: func(_ httptrace.WroteRequestInfo) {
			fmt.Printf("%30s: %s\n", "WroteRequest", time.Now())
		},
		GotFirstResponseByte: func() {
			fmt.Printf("%30s: %s\n", "GotFirstResponseByte", time.Now())
		},
	}
	req = req.WithContext(httptrace.WithClientTrace(req.Context(), trace))
    resp, _ := http.DefaultClient.Do(req)
    fmt.Printf("%30s  %d", "", resp.StatusCode)
}