http.RoundTripper

main.go

package main

import (
        "fmt"
        "net/http"
)

type transport struct {
        r http.RoundTripper
}

func (t transport) RoundTrip(req *http.Request) (*http.Response, error) {
        resp, err := t.r.RoundTrip(req)
        defer resp.Body.Close()
        fmt.Printf("%v %v %v\n", req.Method, req.URL, resp.StatusCode)
        return resp, err
}

func main() {
        client := http.Client{}
        http.DefaultTransport = transport{r: http.DefaultTransport}
        client.Get("https://www.amebaownd.com")
}