CLI tool that prints the HTTP HEAD response for an url

head.go

package main

import (
	"fmt"
	"net/http"
	"net/http/httputil"
	"os"
)

const defaultUrl = "https://example.com"

func main() {
	url := defaultUrl
	if len(os.Args) < 2 {
		fmt.Println("Missing argument: url to head, using ", defaultUrl)
	} else {
		url = os.Args[1]
	}
	resp, err := http.Head(url)
	if hasErr(err) {
		return
	}

	defer resp.Body.Close()
	dump, err := httputil.DumpResponse(resp, false)
	if hasErr(err) {
		return
	}

	fmt.Printf("%s", dump)
}

func hasErr(err error) bool {
	erred := err != nil
	if erred {
		fmt.Println("Couldn't do it", err)
	}
	return erred
}