自Go 1.7起就有对此的内置支持。Go
1.7添加了HTTP跟踪，请阅读博客文章：HTTP跟踪简介
您可以指定在发出HTTP（S）请求时在适当的阶段/点调用的回调函数。您可以通过创建值来指定回调函数
httptrace.ClientTrace，然后使用来“武装”它
httptrace.WithClientTrace()。
这是一个示例函数，该函数获取URL参数，并打印获取它的时间：
func timeGet(url string) { req, _ := http.NewRequest("GET", url, nil) var start, connect, dns, tlsHandshake time.Time trace := &httptrace.ClientTrace{ DNSStart: func(dsi httptrace.DNSStartInfo) { dns = time.Now() }, DNSDone: func(ddi httptrace.DNSDoneInfo) { fmt.Printf("DNS Done: %vn", time.Since(dns)) }, TLSHandshakeStart: func() { tlsHandshake = time.Now() }, TLSHandshakeDone: func(cs tls.ConnectionState, err error) { fmt.Printf("TLS Handshake: %vn", time.Since(tlsHandshake)) }, ConnectStart: func(network, addr string) { connect = time.Now() }, ConnectDone: func(network, addr string, err error) { fmt.Printf("Connect time: %vn", time.Since(connect)) }, GotFirstResponseByte: func() { fmt.Printf("Time from start to first byte: %vn", time.Since(start)) }, } req = req.WithContext(httptrace.WithClientTrace(req.Context(), trace)) start = time.Now() if _, err := http.DefaultTransport.RoundTrip(req); err != nil { log.Fatal(err) } fmt.Printf("Total time: %vn", time.Since(start))}调用它的示例：
timeGet("https://google.com")输出示例：
DNS Done: 7.998465msConnect time: 12.677085msTLS Handshake: 128.65394msTime from start to first byte: 176.461087msTotal time: 176.723402ms
另外，请务必查看github.com/davecheney/httpstat，它为您提供了一个CLI实用程序，该实用程序也可以在后台使用该
httptracing软件包。
