Read the data from the body of a HTTP response

print-data-url.go

package main

import (
	"errors"
	"fmt"
	"io/ioutil"
	"net/http"
	"os"
)

func printDataUrl(httpUrl string) (string, error) {
	client := http.DefaultClient
	respHttp, err := http.NewRequest("GET", httpUrl, nil)
	if err != nil {
		return "", err
	}
	resp, err := client.Do(respHttp)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()
	if resp.StatusCode == 404 {
		return "", errors.New("Error 404 : Page not found")
	}
	respText, err := ioutil.ReadAll(resp.Body) // Body io.ReadCloser
	if err != nil {
		return "", err
	}
	trueText := string(respText)
	return trueText, nil
}

func main() {
	if len(os.Args) != 2 {
		fmt.Printf("Usage: go run print-data-url.go url_link\n")
		return
	}
	text, err := printDataUrl(os.Args[1])
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Printf("%s", text)
	return
}