exercise09.go

// Copyright © 2016, 2019 Alan A. A. Donovan & Brian W. Kernighan.
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// Modified by Andy Dalton to implement exercise solution.

// Fetch prints the content found at a URL.
package main

import (
	"fmt"
	"io"
	"net/http"
	"os"
	"strings"
)

func main() {
	const httpPrefix = "http://"

	for _, url := range os.Args[1:] {
		if !strings.HasPrefix(url, httpPrefix) {
			url = httpPrefix + url
		}

		resp, err := http.Get(url)
		if err != nil {
			fmt.Fprintf(os.Stderr, "fetch: %v\n", err)
			os.Exit(1)
		}

		fmt.Printf("HTTP Response Status: %v\n\n", resp.Status)

		if _, err = io.Copy(os.Stdout, resp.Body); err != nil {
			fmt.Fprintf(os.Stderr, "fetch: reading %s: %v\n", url, err)
			os.Exit(1)
		}
	}
}