http_error.go

gistfile1.txt

package main

import (
	"fmt"
	"log"

	"github.com/pkg/errors"
)

type HTTPError struct {
	error
	status int
	url    string
}

func NewHTTPError(status int, url string) *HTTPError {
	return &HTTPError{errors.New("http error"), status, url}
}

func (e *HTTPError) Error() string {
	return fmt.Sprintf("%s: status %d from %q", e.Error(), e.status, e.url)
}

func (e *HTTPError) Status() int {
	return e.status
}

func (e *HTTPError) URL() (int, string) {
	return 0, e.url
}

func main() {

	he := NewHTTPError(404, "http://example.com:3000/fail")

	log.Println("----------")
	log.Println(he)
	log.Println("----------")
	log.Print(he)
	log.Println("----------")
	log.Println(he.URL())
	log.Println("----------")
}