MVP for a command line RFC reader

rfcreader.go

package main

import (
	"bufio"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"strings"
)

func main() {
	var rfcID string
	var err error

	if len(os.Args) > 1 {
		rfcID = os.Args[1]
	}

	if rfcID == "" {
		fmt.Printf("Enter the RFC ID: ")
		rfcID, err = bufio.NewReader(os.Stdin).ReadString('\n')
		if err != nil {
			log.Fatal(err)
		}
	}

	url := fmt.Sprintf("https://tools.ietf.org/rfc/rfc%s.txt", rfcID)
	url = strings.Replace(url, "\n", "", -1)
	response, err := http.Get(url)
	if err != nil {
		log.Fatal(err)
	}
	defer response.Body.Close()
	if response.StatusCode != 200 {
		log.Fatal(fmt.Sprintf("Status returned: %d", response.StatusCode))
	}

	rfcData, err := ioutil.ReadAll(response.Body)
	if err != nil {
		log.Fatal(err)
	}

	rfcPages := strings.Split(string(rfcData), "\f")

	pageIdx := 0
	for pageIdx < len(rfcPages) {
		fmt.Print(rfcPages[pageIdx])
		input, err := bufio.NewReader(os.Stdin).ReadString('\n')
		if err != nil {
			log.Fatal(err)
		}
		if input[0] == 'q' {
			break
		}
		pageIdx++
	}
}